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wdenkc6097192002-11-03 00:24:07 +00001#
Wolfgang Denk8c831282012-01-19 10:58:21 +01002# (C) Copyright 2000 - 2012
wdenkc6097192002-11-03 00:24:07 +00003# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4#
5# See file CREDITS for list of people who contributed to this
6# project.
7#
8# This program is free software; you can redistribute it and/or
9# modify it under the terms of the GNU General Public License as
10# published by the Free Software Foundation; either version 2 of
11# the License, or (at your option) any later version.
12#
13# This program is distributed in the hope that it will be useful,
14# but WITHOUT ANY WARRANTY; without even the implied warranty of
15# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16# GNU General Public License for more details.
17#
18# You should have received a copy of the GNU General Public License
19# along with this program; if not, write to the Free Software
20# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21# MA 02111-1307 USA
22#
23
24Summary:
25========
26
wdenk24ee89b2002-11-03 17:56:27 +000027This directory contains the source code for U-Boot, a boot loader for
wdenkce4832c2004-10-17 21:12:06 +000028Embedded boards based on PowerPC, ARM, MIPS and several other
29processors, which can be installed in a boot ROM and used to
30initialize and test the hardware or to download and run application
31code.
wdenkc6097192002-11-03 00:24:07 +000032
33The development of U-Boot is closely related to Linux: some parts of
wdenk24ee89b2002-11-03 17:56:27 +000034the source code originate in the Linux source tree, we have some
35header files in common, and special provision has been made to
wdenkc6097192002-11-03 00:24:07 +000036support booting of Linux images.
37
38Some attention has been paid to make this software easily
39configurable and extendable. For instance, all monitor commands are
40implemented with the same call interface, so that it's very easy to
41add new commands. Also, instead of permanently adding rarely used
42code (for instance hardware test utilities) to the monitor, you can
43load and run it dynamically.
44
45
46Status:
47=======
48
49In general, all boards for which a configuration option exists in the
wdenk24ee89b2002-11-03 17:56:27 +000050Makefile have been tested to some extent and can be considered
wdenkc6097192002-11-03 00:24:07 +000051"working". In fact, many of them are used in production systems.
52
wdenk24ee89b2002-11-03 17:56:27 +000053In case of problems see the CHANGELOG and CREDITS files to find out
Wolfgang Denkb240aef2008-03-26 10:40:12 +010054who contributed the specific port. The MAINTAINERS file lists board
55maintainers.
wdenkc6097192002-11-03 00:24:07 +000056
Robert P. J. Day974ed2f2012-11-14 02:03:20 +000057Note: There is no CHANGELOG file in the actual U-Boot source tree;
58it can be created dynamically from the Git log using:
59
60 make CHANGELOG
61
wdenkc6097192002-11-03 00:24:07 +000062
63Where to get help:
64==================
65
wdenk24ee89b2002-11-03 17:56:27 +000066In case you have questions about, problems with or contributions for
67U-Boot you should send a message to the U-Boot mailing list at
Peter Tyser8804a612008-09-10 09:18:34 -050068<u-boot@lists.denx.de>. There is also an archive of previous traffic
69on the mailing list - please search the archive before asking FAQ's.
70Please see http://lists.denx.de/pipermail/u-boot and
71http://dir.gmane.org/gmane.comp.boot-loaders.u-boot
wdenkc6097192002-11-03 00:24:07 +000072
73
Wolfgang Denkb240aef2008-03-26 10:40:12 +010074Where to get source code:
75=========================
76
77The U-Boot source code is maintained in the git repository at
78git://www.denx.de/git/u-boot.git ; you can browse it online at
79http://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary
80
81The "snapshot" links on this page allow you to download tarballs of
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +020082any version you might be interested in. Official releases are also
Wolfgang Denkb240aef2008-03-26 10:40:12 +010083available for FTP download from the ftp://ftp.denx.de/pub/u-boot/
84directory.
85
Anatolij Gustschin08337f32008-03-26 18:13:33 +010086Pre-built (and tested) images are available from
Wolfgang Denkb240aef2008-03-26 10:40:12 +010087ftp://ftp.denx.de/pub/u-boot/images/
88
89
wdenkc6097192002-11-03 00:24:07 +000090Where we come from:
91===================
92
93- start from 8xxrom sources
wdenk24ee89b2002-11-03 17:56:27 +000094- create PPCBoot project (http://sourceforge.net/projects/ppcboot)
wdenkc6097192002-11-03 00:24:07 +000095- clean up code
96- make it easier to add custom boards
97- make it possible to add other [PowerPC] CPUs
98- extend functions, especially:
99 * Provide extended interface to Linux boot loader
100 * S-Record download
101 * network boot
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +0200102 * PCMCIA / CompactFlash / ATA disk / SCSI ... boot
wdenk24ee89b2002-11-03 17:56:27 +0000103- create ARMBoot project (http://sourceforge.net/projects/armboot)
wdenkc6097192002-11-03 00:24:07 +0000104- add other CPU families (starting with ARM)
wdenk24ee89b2002-11-03 17:56:27 +0000105- create U-Boot project (http://sourceforge.net/projects/u-boot)
Magnus Liljaf3b287b2008-08-06 19:32:33 +0200106- current project page: see http://www.denx.de/wiki/U-Boot
wdenk24ee89b2002-11-03 17:56:27 +0000107
108
109Names and Spelling:
110===================
111
112The "official" name of this project is "Das U-Boot". The spelling
113"U-Boot" shall be used in all written text (documentation, comments
114in source files etc.). Example:
115
116 This is the README file for the U-Boot project.
117
118File names etc. shall be based on the string "u-boot". Examples:
119
120 include/asm-ppc/u-boot.h
121
122 #include <asm/u-boot.h>
123
124Variable names, preprocessor constants etc. shall be either based on
125the string "u_boot" or on "U_BOOT". Example:
wdenkc6097192002-11-03 00:24:07 +0000126
wdenk24ee89b2002-11-03 17:56:27 +0000127 U_BOOT_VERSION u_boot_logo
128 IH_OS_U_BOOT u_boot_hush_start
129
wdenkc6097192002-11-03 00:24:07 +0000130
wdenk7474aca2002-12-17 17:55:09 +0000131Versioning:
132===========
133
Thomas Webere89e6282010-09-28 08:06:25 +0200134Starting with the release in October 2008, the names of the releases
135were changed from numerical release numbers without deeper meaning
136into a time stamp based numbering. Regular releases are identified by
137names consisting of the calendar year and month of the release date.
138Additional fields (if present) indicate release candidates or bug fix
139releases in "stable" maintenance trees.
wdenk7474aca2002-12-17 17:55:09 +0000140
Thomas Webere89e6282010-09-28 08:06:25 +0200141Examples:
Wolfgang Denk092ae952011-10-26 10:21:21 +0000142 U-Boot v2009.11 - Release November 2009
Thomas Webere89e6282010-09-28 08:06:25 +0200143 U-Boot v2009.11.1 - Release 1 in version November 2009 stable tree
144 U-Boot v2010.09-rc1 - Release candiate 1 for September 2010 release
wdenk7474aca2002-12-17 17:55:09 +0000145
146
wdenkc6097192002-11-03 00:24:07 +0000147Directory Hierarchy:
148====================
149
Peter Tysere4d1abc2010-04-12 22:28:21 -0500150/arch Architecture specific files
151 /arm Files generic to ARM architecture
152 /cpu CPU specific files
153 /arm720t Files specific to ARM 720 CPUs
154 /arm920t Files specific to ARM 920 CPUs
Andreas Bießmannd9a9d562011-07-18 09:41:08 +0000155 /at91 Files specific to Atmel AT91RM9200 CPU
Wolfgang Denk16fa98a2010-06-13 17:48:15 +0200156 /imx Files specific to Freescale MC9328 i.MX CPUs
157 /s3c24x0 Files specific to Samsung S3C24X0 CPUs
Peter Tysere4d1abc2010-04-12 22:28:21 -0500158 /arm925t Files specific to ARM 925 CPUs
159 /arm926ejs Files specific to ARM 926 CPUs
160 /arm1136 Files specific to ARM 1136 CPUs
161 /ixp Files specific to Intel XScale IXP CPUs
162 /pxa Files specific to Intel XScale PXA CPUs
163 /s3c44b0 Files specific to Samsung S3C44B0 CPUs
164 /sa1100 Files specific to Intel StrongARM SA1100 CPUs
165 /lib Architecture specific library files
166 /avr32 Files generic to AVR32 architecture
167 /cpu CPU specific files
168 /lib Architecture specific library files
169 /blackfin Files generic to Analog Devices Blackfin architecture
170 /cpu CPU specific files
171 /lib Architecture specific library files
Graeme Russcbfce1d2011-04-13 19:43:28 +1000172 /x86 Files generic to x86 architecture
Peter Tysere4d1abc2010-04-12 22:28:21 -0500173 /cpu CPU specific files
174 /lib Architecture specific library files
175 /m68k Files generic to m68k architecture
176 /cpu CPU specific files
177 /mcf52x2 Files specific to Freescale ColdFire MCF52x2 CPUs
178 /mcf5227x Files specific to Freescale ColdFire MCF5227x CPUs
179 /mcf532x Files specific to Freescale ColdFire MCF5329 CPUs
180 /mcf5445x Files specific to Freescale ColdFire MCF5445x CPUs
181 /mcf547x_8x Files specific to Freescale ColdFire MCF547x_8x CPUs
182 /lib Architecture specific library files
183 /microblaze Files generic to microblaze architecture
184 /cpu CPU specific files
185 /lib Architecture specific library files
186 /mips Files generic to MIPS architecture
187 /cpu CPU specific files
Daniel Schwierzeckd52a6232011-07-27 13:22:39 +0200188 /mips32 Files specific to MIPS32 CPUs
Xiangfu Liu2f46d422011-10-12 12:24:06 +0800189 /xburst Files specific to Ingenic XBurst CPUs
Peter Tysere4d1abc2010-04-12 22:28:21 -0500190 /lib Architecture specific library files
Macpaul Lin1cac36e2011-10-19 20:41:11 +0000191 /nds32 Files generic to NDS32 architecture
192 /cpu CPU specific files
193 /n1213 Files specific to Andes Technology N1213 CPUs
194 /lib Architecture specific library files
Peter Tysere4d1abc2010-04-12 22:28:21 -0500195 /nios2 Files generic to Altera NIOS2 architecture
196 /cpu CPU specific files
197 /lib Architecture specific library files
Stefan Roese88fbf932010-04-15 16:07:28 +0200198 /powerpc Files generic to PowerPC architecture
Peter Tysere4d1abc2010-04-12 22:28:21 -0500199 /cpu CPU specific files
200 /74xx_7xx Files specific to Freescale MPC74xx and 7xx CPUs
201 /mpc5xx Files specific to Freescale MPC5xx CPUs
202 /mpc5xxx Files specific to Freescale MPC5xxx CPUs
203 /mpc8xx Files specific to Freescale MPC8xx CPUs
204 /mpc8220 Files specific to Freescale MPC8220 CPUs
205 /mpc824x Files specific to Freescale MPC824x CPUs
206 /mpc8260 Files specific to Freescale MPC8260 CPUs
207 /mpc85xx Files specific to Freescale MPC85xx CPUs
208 /ppc4xx Files specific to AMCC PowerPC 4xx CPUs
209 /lib Architecture specific library files
210 /sh Files generic to SH architecture
211 /cpu CPU specific files
212 /sh2 Files specific to sh2 CPUs
213 /sh3 Files specific to sh3 CPUs
214 /sh4 Files specific to sh4 CPUs
215 /lib Architecture specific library files
216 /sparc Files generic to SPARC architecture
217 /cpu CPU specific files
218 /leon2 Files specific to Gaisler LEON2 SPARC CPU
219 /leon3 Files specific to Gaisler LEON3 SPARC CPU
220 /lib Architecture specific library files
221/api Machine/arch independent API for external apps
222/board Board dependent files
223/common Misc architecture independent functions
224/disk Code for disk drive partition handling
225/doc Documentation (don't expect too much)
226/drivers Commonly used device drivers
227/examples Example code for standalone applications, etc.
228/fs Filesystem code (cramfs, ext2, jffs2, etc.)
229/include Header Files
230/lib Files generic to all architectures
231 /libfdt Library files to support flattened device trees
232 /lzma Library files to support LZMA decompression
233 /lzo Library files to support LZO decompression
234/net Networking code
235/post Power On Self Test
236/rtc Real Time Clock drivers
237/tools Tools to build S-Record or U-Boot images, etc.
wdenkc6097192002-11-03 00:24:07 +0000238
wdenkc6097192002-11-03 00:24:07 +0000239Software Configuration:
240=======================
241
242Configuration is usually done using C preprocessor defines; the
243rationale behind that is to avoid dead code whenever possible.
244
245There are two classes of configuration variables:
246
247* Configuration _OPTIONS_:
248 These are selectable by the user and have names beginning with
249 "CONFIG_".
250
251* Configuration _SETTINGS_:
252 These depend on the hardware etc. and should not be meddled with if
253 you don't know what you're doing; they have names beginning with
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +0200254 "CONFIG_SYS_".
wdenkc6097192002-11-03 00:24:07 +0000255
256Later we will add a configuration tool - probably similar to or even
257identical to what's used for the Linux kernel. Right now, we have to
258do the configuration by hand, which means creating some symbolic
259links and editing some configuration files. We use the TQM8xxL boards
260as an example here.
261
262
263Selection of Processor Architecture and Board Type:
264---------------------------------------------------
265
266For all supported boards there are ready-to-use default
267configurations available; just type "make <board_name>_config".
268
269Example: For a TQM823L module type:
270
271 cd u-boot
272 make TQM823L_config
273
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +0200274For the Cogent platform, you need to specify the CPU type as well;
wdenkc6097192002-11-03 00:24:07 +0000275e.g. "make cogent_mpc8xx_config". And also configure the cogent
276directory according to the instructions in cogent/README.
277
278
279Configuration Options:
280----------------------
281
282Configuration depends on the combination of board and CPU type; all
283such information is kept in a configuration file
284"include/configs/<board_name>.h".
285
286Example: For a TQM823L module, all configuration settings are in
287"include/configs/TQM823L.h".
288
289
wdenk1272e232002-11-10 22:06:23 +0000290Many of the options are named exactly as the corresponding Linux
291kernel configuration options. The intention is to make it easier to
292build a config tool - later.
293
294
wdenkc6097192002-11-03 00:24:07 +0000295The following options need to be configured:
296
Kim Phillips203fee32007-08-10 13:28:25 -0500297- CPU Type: Define exactly one, e.g. CONFIG_MPC85XX.
wdenkc6097192002-11-03 00:24:07 +0000298
Kim Phillips203fee32007-08-10 13:28:25 -0500299- Board Type: Define exactly one, e.g. CONFIG_MPC8540ADS.
Wolfgang Denk994ad962006-10-24 14:42:37 +0200300
301- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
Haavard Skinnemoen9d5a43f2007-11-01 12:44:20 +0100302 Define exactly one, e.g. CONFIG_ATSTK1002
wdenkc6097192002-11-03 00:24:07 +0000303
304- CPU Module Type: (if CONFIG_COGENT is defined)
305 Define exactly one of
306 CONFIG_CMA286_60_OLD
307--- FIXME --- not tested yet:
308 CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
309 CONFIG_CMA287_23, CONFIG_CMA287_50
310
311- Motherboard Type: (if CONFIG_COGENT is defined)
312 Define exactly one of
313 CONFIG_CMA101, CONFIG_CMA102
314
315- Motherboard I/O Modules: (if CONFIG_COGENT is defined)
316 Define one or more of
317 CONFIG_CMA302
318
319- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
320 Define one or more of
321 CONFIG_LCD_HEARTBEAT - update a character position on
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +0200322 the LCD display every second with
wdenkc6097192002-11-03 00:24:07 +0000323 a "rotator" |\-/|\-/
324
wdenk2bb11052003-07-17 23:16:40 +0000325- Board flavour: (if CONFIG_MPC8260ADS is defined)
326 CONFIG_ADSTYPE
327 Possible values are:
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +0200328 CONFIG_SYS_8260ADS - original MPC8260ADS
329 CONFIG_SYS_8266ADS - MPC8266ADS
330 CONFIG_SYS_PQ2FADS - PQ2FADS-ZU or PQ2FADS-VR
331 CONFIG_SYS_8272ADS - MPC8272ADS
wdenk2bb11052003-07-17 23:16:40 +0000332
Lei Wen20014762011-02-09 18:06:58 +0530333- Marvell Family Member
334 CONFIG_SYS_MVFS - define it if you want to enable
335 multiple fs option at one time
336 for marvell soc family
337
wdenkc6097192002-11-03 00:24:07 +0000338- MPC824X Family Member (if CONFIG_MPC824X is defined)
wdenk9b7f3842003-10-09 20:09:04 +0000339 Define exactly one of
340 CONFIG_MPC8240, CONFIG_MPC8245
wdenkc6097192002-11-03 00:24:07 +0000341
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +0200342- 8xx CPU Options: (if using an MPC8xx CPU)
wdenk20bddb32004-09-28 17:59:53 +0000343 CONFIG_8xx_GCLK_FREQ - deprecated: CPU clock if
344 get_gclk_freq() cannot work
wdenk9b7f3842003-10-09 20:09:04 +0000345 e.g. if there is no 32KHz
346 reference PIT/RTC clock
wdenk20bddb32004-09-28 17:59:53 +0000347 CONFIG_8xx_OSCLK - PLL input clock (either EXTCLK
348 or XTAL/EXTAL)
wdenkc6097192002-11-03 00:24:07 +0000349
wdenk20bddb32004-09-28 17:59:53 +0000350- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +0200351 CONFIG_SYS_8xx_CPUCLK_MIN
352 CONFIG_SYS_8xx_CPUCLK_MAX
wdenk20bddb32004-09-28 17:59:53 +0000353 CONFIG_8xx_CPUCLK_DEFAULT
wdenkfde37042004-01-31 20:06:54 +0000354 See doc/README.MPC866
355
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +0200356 CONFIG_SYS_MEASURE_CPUCLK
wdenkfde37042004-01-31 20:06:54 +0000357
wdenk544e9732004-02-06 23:19:44 +0000358 Define this to measure the actual CPU clock instead
359 of relying on the correctness of the configured
360 values. Mostly useful for board bringup to make sure
361 the PLL is locked at the intended frequency. Note
362 that this requires a (stable) reference clock (32 kHz
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +0200363 RTC clock or CONFIG_SYS_8XX_XIN)
wdenkfde37042004-01-31 20:06:54 +0000364
Heiko Schocher734f0272009-03-12 07:37:15 +0100365 CONFIG_SYS_DELAYED_ICACHE
366
367 Define this option if you want to enable the
368 ICache only when Code runs from RAM.
369
Kumar Galaf4fb90f2011-02-18 05:40:54 -0600370- 85xx CPU Options:
York Sun2394a0f2012-10-08 07:44:30 +0000371 CONFIG_SYS_PPC64
372
373 Specifies that the core is a 64-bit PowerPC implementation (implements
374 the "64" category of the Power ISA). This is necessary for ePAPR
375 compliance, among other possible reasons.
376
Kumar Galaf4fb90f2011-02-18 05:40:54 -0600377 CONFIG_SYS_FSL_TBCLK_DIV
378
379 Defines the core time base clock divider ratio compared to the
380 system clock. On most PQ3 devices this is 8, on newer QorIQ
381 devices it can be 16 or 32. The ratio varies from SoC to Soc.
382
Kumar Gala179b1b22011-05-20 00:39:21 -0500383 CONFIG_SYS_FSL_PCIE_COMPAT
384
385 Defines the string to utilize when trying to match PCIe device
386 tree nodes for the given platform.
387
Prabhakar Kushwahaa6a30622012-04-29 23:56:13 +0000388 CONFIG_SYS_PPC_E500_DEBUG_TLB
389
390 Enables a temporary TLB entry to be used during boot to work
391 around limitations in e500v1 and e500v2 external debugger
392 support. This reduces the portions of the boot code where
393 breakpoints and single stepping do not work. The value of this
394 symbol should be set to the TLB1 entry to be used for this
395 purpose.
396
Scott Wood80806962012-08-14 10:14:53 +0000397 CONFIG_SYS_FSL_ERRATUM_A004510
398
399 Enables a workaround for erratum A004510. If set,
400 then CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV and
401 CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY must be set.
402
403 CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV
404 CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV2 (optional)
405
406 Defines one or two SoC revisions (low 8 bits of SVR)
407 for which the A004510 workaround should be applied.
408
409 The rest of SVR is either not relevant to the decision
410 of whether the erratum is present (e.g. p2040 versus
411 p2041) or is implied by the build target, which controls
412 whether CONFIG_SYS_FSL_ERRATUM_A004510 is set.
413
414 See Freescale App Note 4493 for more information about
415 this erratum.
416
417 CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY
418
419 This is the value to write into CCSR offset 0x18600
420 according to the A004510 workaround.
421
Daniel Schwierzeckd8a49ca2012-04-02 02:57:56 +0000422- Generic CPU options:
423 CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN
424
425 Defines the endianess of the CPU. Implementation of those
426 values is arch specific.
427
Markus Klotzbuecher6e5c19a2006-03-24 15:28:02 +0100428- Intel Monahans options:
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +0200429 CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
Markus Klotzbuecher6e5c19a2006-03-24 15:28:02 +0100430
431 Defines the Monahans run mode to oscillator
432 ratio. Valid values are 8, 16, 24, 31. The core
433 frequency is this value multiplied by 13 MHz.
434
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +0200435 CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO
Wolfgang Denkebd3deb2006-04-16 10:51:58 +0200436
Markus Klotzbuecher6e5c19a2006-03-24 15:28:02 +0100437 Defines the Monahans turbo mode to oscillator
438 ratio. Valid values are 1 (default if undefined) and
Wolfgang Denkebd3deb2006-04-16 10:51:58 +0200439 2. The core frequency as calculated above is multiplied
Markus Klotzbuecher6e5c19a2006-03-24 15:28:02 +0100440 by this value.
Wolfgang Denkebd3deb2006-04-16 10:51:58 +0200441
Daniel Schwierzeckd52a6232011-07-27 13:22:39 +0200442- MIPS CPU options:
443 CONFIG_SYS_INIT_SP_OFFSET
444
445 Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack
446 pointer. This is needed for the temporary stack before
447 relocation.
448
449 CONFIG_SYS_MIPS_CACHE_MODE
450
451 Cache operation mode for the MIPS CPU.
452 See also arch/mips/include/asm/mipsregs.h.
453 Possible values are:
454 CONF_CM_CACHABLE_NO_WA
455 CONF_CM_CACHABLE_WA
456 CONF_CM_UNCACHED
457 CONF_CM_CACHABLE_NONCOHERENT
458 CONF_CM_CACHABLE_CE
459 CONF_CM_CACHABLE_COW
460 CONF_CM_CACHABLE_CUW
461 CONF_CM_CACHABLE_ACCELERATED
462
463 CONFIG_SYS_XWAY_EBU_BOOTCFG
464
465 Special option for Lantiq XWAY SoCs for booting from NOR flash.
466 See also arch/mips/cpu/mips32/start.S.
467
468 CONFIG_XWAY_SWAP_BYTES
469
470 Enable compilation of tools/xway-swap-bytes needed for Lantiq
471 XWAY SoCs for booting from NOR flash. The U-Boot image needs to
472 be swapped if a flash programmer is used.
473
Christian Riesch48c2d6d2012-02-02 00:44:39 +0000474- ARM options:
475 CONFIG_SYS_EXCEPTION_VECTORS_HIGH
476
477 Select high exception vectors of the ARM core, e.g., do not
478 clear the V bit of the c1 register of CP15.
479
Aneesh Vb8e40802012-03-08 07:20:19 +0000480 CONFIG_SYS_THUMB_BUILD
481
482 Use this flag to build U-Boot using the Thumb instruction
483 set for ARM architectures. Thumb instruction set provides
484 better code density. For ARM architectures that support
485 Thumb2 this flag will result in Thumb2 code generated by
486 GCC.
487
wdenk9b7f3842003-10-09 20:09:04 +0000488- Linux Kernel Interface:
wdenkc6097192002-11-03 00:24:07 +0000489 CONFIG_CLOCKS_IN_MHZ
490
491 U-Boot stores all clock information in Hz
492 internally. For binary compatibility with older Linux
493 kernels (which expect the clocks passed in the
494 bd_info data to be in MHz) the environment variable
495 "clocks_in_mhz" can be defined so that U-Boot
496 converts clock data to MHZ before passing it to the
497 Linux kernel.
wdenkc6097192002-11-03 00:24:07 +0000498 When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
Wolfgang Denkb240aef2008-03-26 10:40:12 +0100499 "clocks_in_mhz=1" is automatically included in the
wdenkc6097192002-11-03 00:24:07 +0000500 default environment.
501
wdenk9b7f3842003-10-09 20:09:04 +0000502 CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only]
503
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +0200504 When transferring memsize parameter to linux, some versions
wdenk9b7f3842003-10-09 20:09:04 +0000505 expect it to be in bytes, others in MB.
506 Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
507
Gerald Van Barenfcd91bb2008-06-03 20:34:45 -0400508 CONFIG_OF_LIBFDT
Wolfgang Denk27a5b0b2005-10-13 01:45:54 +0200509
510 New kernel versions are expecting firmware settings to be
Gerald Van Barend6abef42007-03-31 12:23:51 -0400511 passed using flattened device trees (based on open firmware
512 concepts).
513
514 CONFIG_OF_LIBFDT
515 * New libfdt-based support
516 * Adds the "fdt" command
Kim Phillips9b46eb62007-08-10 14:34:14 -0500517 * The bootm command automatically updates the fdt
Gerald Van Barend6abef42007-03-31 12:23:51 -0400518
Marcel Ziswilerb29bc712009-09-09 21:18:41 +0200519 OF_CPU - The proper name of the cpus node (only required for
520 MPC512X and MPC5xxx based boards).
521 OF_SOC - The proper name of the soc node (only required for
522 MPC512X and MPC5xxx based boards).
Wolfgang Denk27a5b0b2005-10-13 01:45:54 +0200523 OF_TBCLK - The timebase frequency.
Kumar Galae40c2b52006-01-11 13:59:02 -0600524 OF_STDOUT_PATH - The path to the console device
Wolfgang Denk27a5b0b2005-10-13 01:45:54 +0200525
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +0200526 boards with QUICC Engines require OF_QE to set UCC MAC
527 addresses
Kim Phillips9b46eb62007-08-10 14:34:14 -0500528
Kumar Gala1e26aa52006-01-11 13:54:17 -0600529 CONFIG_OF_BOARD_SETUP
530
531 Board code has addition modification that it wants to make
532 to the flat device tree before handing it off to the kernel
wdenkda04a8b2004-08-02 23:22:59 +0000533
Matthew McClintockefae4ca2006-06-28 10:41:37 -0500534 CONFIG_OF_BOOT_CPU
535
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +0200536 This define fills in the correct boot CPU in the boot
Matthew McClintockefae4ca2006-06-28 10:41:37 -0500537 param header, the default value is zero if undefined.
538
Heiko Schocherffb293a2009-09-23 07:56:08 +0200539 CONFIG_OF_IDE_FIXUP
540
541 U-Boot can detect if an IDE device is present or not.
542 If not, and this new config option is activated, U-Boot
543 removes the ATA node from the DTS before booting Linux,
544 so the Linux IDE driver does not probe the device and
545 crash. This is needed for buggy hardware (uc101) where
546 no pull down resistor is connected to the signal IDE5V_DD7.
547
Igor Grinberg06890672011-07-14 05:45:07 +0000548 CONFIG_MACH_TYPE [relevant for ARM only][mandatory]
549
550 This setting is mandatory for all boards that have only one
551 machine type and must be used to specify the machine type
552 number as it appears in the ARM machine registry
553 (see http://www.arm.linux.org.uk/developer/machines/).
554 Only boards that have multiple machine types supported
555 in a single configuration file and the machine type is
556 runtime discoverable, do not have to use this setting.
557
Niklaus Giger0ab978d2008-11-03 22:13:47 +0100558- vxWorks boot parameters:
559
560 bootvx constructs a valid bootline using the following
561 environments variables: bootfile, ipaddr, serverip, hostname.
562 It loads the vxWorks image pointed bootfile.
563
564 CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
565 CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
566 CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
567 CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters
568
569 CONFIG_SYS_VXWORKS_ADD_PARAMS
570
571 Add it at the end of the bootline. E.g "u=username pw=secret"
572
573 Note: If a "bootargs" environment is defined, it will overwride
574 the defaults discussed just above.
575
Aneesh V960f5c02011-06-16 23:30:47 +0000576- Cache Configuration:
577 CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot
578 CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot
579 CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot
580
Aneesh V686a0752011-06-16 23:30:51 +0000581- Cache Configuration for ARM:
582 CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache
583 controller
584 CONFIG_SYS_PL310_BASE - Physical base address of PL310
585 controller register space
586
wdenkda04a8b2004-08-02 23:22:59 +0000587- Serial Ports:
Andreas Engel0813b122008-09-08 14:30:53 +0200588 CONFIG_PL010_SERIAL
wdenkda04a8b2004-08-02 23:22:59 +0000589
590 Define this if you want support for Amba PrimeCell PL010 UARTs.
591
Andreas Engel0813b122008-09-08 14:30:53 +0200592 CONFIG_PL011_SERIAL
wdenkda04a8b2004-08-02 23:22:59 +0000593
594 Define this if you want support for Amba PrimeCell PL011 UARTs.
595
596 CONFIG_PL011_CLOCK
597
598 If you have Amba PrimeCell PL011 UARTs, set this variable to
599 the clock speed of the UARTs.
600
601 CONFIG_PL01x_PORTS
602
603 If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
604 define this to a list of base addresses for each (supported)
605 port. See e.g. include/configs/versatile.h
606
John Rigby34e21ee2011-04-19 10:42:39 +0000607 CONFIG_PL011_SERIAL_RLCR
608
609 Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500)
610 have separate receive and transmit line control registers. Set
611 this variable to initialize the extra register.
612
613 CONFIG_PL011_SERIAL_FLUSH_ON_INIT
614
615 On some platforms (e.g. U8500) U-Boot is loaded by a second stage
616 boot loader that has already initialized the UART. Define this
617 variable to flush the UART at init time.
618
Javier Martinez Canillas141e0112013-01-07 01:35:20 +0000619 CONFIG_SYS_NS16550_BROKEN_TEMT
620
621 16550 UART set the Transmitter Empty (TEMT) Bit when all output
622 has finished and the transmitter is totally empty. U-Boot waits
623 for this bit to be set to initialize the serial console. On some
624 broken platforms this bit is not set in SPL making U-Boot to
625 hang while waiting for TEMT. Define this option to avoid it.
626
wdenkda04a8b2004-08-02 23:22:59 +0000627
wdenkc6097192002-11-03 00:24:07 +0000628- Console Interface:
wdenk4a5c8a72003-03-06 00:02:04 +0000629 Depending on board, define exactly one serial port
630 (like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
631 CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
632 console by defining CONFIG_8xx_CONS_NONE
wdenkc6097192002-11-03 00:24:07 +0000633
634 Note: if CONFIG_8xx_CONS_NONE is defined, the serial
635 port routines must be defined elsewhere
636 (i.e. serial_init(), serial_getc(), ...)
637
638 CONFIG_CFB_CONSOLE
639 Enables console device for a color framebuffer. Needs following
Wolfgang Denkf6e50a42011-12-07 12:19:20 +0000640 defines (cf. smiLynxEM, i8042)
wdenkc6097192002-11-03 00:24:07 +0000641 VIDEO_FB_LITTLE_ENDIAN graphic memory organisation
642 (default big endian)
643 VIDEO_HW_RECTFILL graphic chip supports
644 rectangle fill
645 (cf. smiLynxEM)
646 VIDEO_HW_BITBLT graphic chip supports
647 bit-blit (cf. smiLynxEM)
648 VIDEO_VISIBLE_COLS visible pixel columns
649 (cols=pitch)
wdenk544e9732004-02-06 23:19:44 +0000650 VIDEO_VISIBLE_ROWS visible pixel rows
651 VIDEO_PIXEL_SIZE bytes per pixel
wdenkc6097192002-11-03 00:24:07 +0000652 VIDEO_DATA_FORMAT graphic data format
653 (0-5, cf. cfb_console.c)
wdenk544e9732004-02-06 23:19:44 +0000654 VIDEO_FB_ADRS framebuffer address
wdenkc6097192002-11-03 00:24:07 +0000655 VIDEO_KBD_INIT_FCT keyboard int fct
656 (i.e. i8042_kbd_init())
657 VIDEO_TSTC_FCT test char fct
658 (i.e. i8042_tstc)
659 VIDEO_GETC_FCT get char fct
660 (i.e. i8042_getc)
661 CONFIG_CONSOLE_CURSOR cursor drawing on/off
662 (requires blink timer
663 cf. i8042.c)
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +0200664 CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
wdenkc6097192002-11-03 00:24:07 +0000665 CONFIG_CONSOLE_TIME display time/date info in
666 upper right corner
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500667 (requires CONFIG_CMD_DATE)
wdenkc6097192002-11-03 00:24:07 +0000668 CONFIG_VIDEO_LOGO display Linux logo in
669 upper left corner
wdenk9dd2b882002-12-03 21:28:10 +0000670 CONFIG_VIDEO_BMP_LOGO use bmp_logo.h instead of
671 linux_logo.h for logo.
672 Requires CONFIG_VIDEO_LOGO
wdenkc6097192002-11-03 00:24:07 +0000673 CONFIG_CONSOLE_EXTRA_INFO
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +0200674 additional board info beside
wdenkc6097192002-11-03 00:24:07 +0000675 the logo
676
Pali Rohár4a57da32012-10-19 13:30:09 +0000677 When CONFIG_CFB_CONSOLE_ANSI is defined, console will support
678 a limited number of ANSI escape sequences (cursor control,
679 erase functions and limited graphics rendition control).
680
wdenk4a5c8a72003-03-06 00:02:04 +0000681 When CONFIG_CFB_CONSOLE is defined, video console is
682 default i/o. Serial console can be forced with
683 environment 'console=serial'.
wdenkc6097192002-11-03 00:24:07 +0000684
wdenk1ebf41e2004-01-02 14:00:00 +0000685 When CONFIG_SILENT_CONSOLE is defined, all console
686 messages (by U-Boot and Linux!) can be silenced with
687 the "silent" environment variable. See
688 doc/README.silent for more information.
wdenk3da587e2003-10-19 23:22:11 +0000689
wdenkc6097192002-11-03 00:24:07 +0000690- Console Baudrate:
691 CONFIG_BAUDRATE - in bps
692 Select one of the baudrates listed in
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +0200693 CONFIG_SYS_BAUDRATE_TABLE, see below.
694 CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
wdenkc6097192002-11-03 00:24:07 +0000695
Heiko Schocher327480a2009-01-30 12:55:38 +0100696- Console Rx buffer length
697 With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
698 the maximum receive buffer length for the SMC.
Heiko Schocher362447f2009-02-10 09:31:47 +0100699 This option is actual only for 82xx and 8xx possible.
Heiko Schocher327480a2009-01-30 12:55:38 +0100700 If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
701 must be defined, to setup the maximum idle timeout for
702 the SMC.
703
Graeme Russ3c28f482011-09-01 00:48:27 +0000704- Pre-Console Buffer:
Wolfgang Denkd590fb12011-10-07 09:58:21 +0200705 Prior to the console being initialised (i.e. serial UART
706 initialised etc) all console output is silently discarded.
707 Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
708 buffer any console messages prior to the console being
709 initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ
710 bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is
711 a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ
Wolfgang Denk23f78482011-10-09 21:06:34 +0200712 bytes are output before the console is initialised, the
Wolfgang Denkd590fb12011-10-07 09:58:21 +0200713 earlier bytes are discarded.
Graeme Russ3c28f482011-09-01 00:48:27 +0000714
Wolfgang Denkd590fb12011-10-07 09:58:21 +0200715 'Sane' compilers will generate smaller code if
716 CONFIG_PRE_CON_BUF_SZ is a power of 2
Graeme Russ3c28f482011-09-01 00:48:27 +0000717
Sonny Raocd55bde2011-11-02 09:52:08 +0000718- Safe printf() functions
719 Define CONFIG_SYS_VSNPRINTF to compile in safe versions of
720 the printf() functions. These are defined in
721 include/vsprintf.h and include snprintf(), vsnprintf() and
722 so on. Code size increase is approximately 300-500 bytes.
723 If this option is not given then these functions will
724 silently discard their buffer size argument - this means
725 you are not getting any overflow checking in this case.
726
wdenkc6097192002-11-03 00:24:07 +0000727- Boot Delay: CONFIG_BOOTDELAY - in seconds
728 Delay before automatically booting the default image;
729 set to -1 to disable autoboot.
Joe Hershberger96ccaf32012-08-17 10:53:12 +0000730 set to -2 to autoboot with no delay and not check for abort
731 (even when CONFIG_ZERO_BOOTDELAY_CHECK is defined).
wdenkc6097192002-11-03 00:24:07 +0000732
733 See doc/README.autoboot for these options that
734 work with CONFIG_BOOTDELAY. None are required.
735 CONFIG_BOOT_RETRY_TIME
736 CONFIG_BOOT_RETRY_MIN
737 CONFIG_AUTOBOOT_KEYED
738 CONFIG_AUTOBOOT_PROMPT
739 CONFIG_AUTOBOOT_DELAY_STR
740 CONFIG_AUTOBOOT_STOP_STR
741 CONFIG_AUTOBOOT_DELAY_STR2
742 CONFIG_AUTOBOOT_STOP_STR2
743 CONFIG_ZERO_BOOTDELAY_CHECK
744 CONFIG_RESET_TO_RETRY
745
746- Autoboot Command:
747 CONFIG_BOOTCOMMAND
748 Only needed when CONFIG_BOOTDELAY is enabled;
749 define a command string that is automatically executed
750 when no character is read on the console interface
751 within "Boot Delay" after reset.
752
753 CONFIG_BOOTARGS
wdenk4a5c8a72003-03-06 00:02:04 +0000754 This can be used to pass arguments to the bootm
755 command. The value of CONFIG_BOOTARGS goes into the
756 environment value "bootargs".
wdenkc6097192002-11-03 00:24:07 +0000757
758 CONFIG_RAMBOOT and CONFIG_NFSBOOT
wdenk4a5c8a72003-03-06 00:02:04 +0000759 The value of these goes into the environment as
760 "ramboot" and "nfsboot" respectively, and can be used
761 as a convenience, when switching between booting from
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +0200762 RAM and NFS.
wdenkc6097192002-11-03 00:24:07 +0000763
764- Pre-Boot Commands:
765 CONFIG_PREBOOT
766
767 When this option is #defined, the existence of the
768 environment variable "preboot" will be checked
769 immediately before starting the CONFIG_BOOTDELAY
770 countdown and/or running the auto-boot command resp.
771 entering interactive mode.
772
773 This feature is especially useful when "preboot" is
774 automatically generated or modified. For an example
775 see the LWMON board specific code: here "preboot" is
776 modified when the user holds down a certain
777 combination of keys on the (special) keyboard when
778 booting the systems
779
780- Serial Download Echo Mode:
781 CONFIG_LOADS_ECHO
782 If defined to 1, all characters received during a
783 serial download (using the "loads" command) are
784 echoed back. This might be needed by some terminal
785 emulations (like "cu"), but may as well just take
786 time on others. This setting #define's the initial
787 value of the "loads_echo" environment variable.
788
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500789- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
wdenkc6097192002-11-03 00:24:07 +0000790 CONFIG_KGDB_BAUDRATE
791 Select one of the baudrates listed in
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +0200792 CONFIG_SYS_BAUDRATE_TABLE, see below.
wdenkc6097192002-11-03 00:24:07 +0000793
794- Monitor Functions:
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500795 Monitor commands can be included or excluded
796 from the build by using the #include files
Stephen Warren963a7cf2012-08-05 16:07:19 +0000797 <config_cmd_all.h> and #undef'ing unwanted
798 commands, or using <config_cmd_default.h>
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500799 and augmenting with additional #define's
800 for wanted commands.
wdenkc6097192002-11-03 00:24:07 +0000801
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500802 The default command configuration includes all commands
803 except those marked below with a "*".
wdenkc6097192002-11-03 00:24:07 +0000804
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500805 CONFIG_CMD_ASKENV * ask for env variable
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500806 CONFIG_CMD_BDI bdinfo
807 CONFIG_CMD_BEDBUG * Include BedBug Debugger
808 CONFIG_CMD_BMP * BMP support
809 CONFIG_CMD_BSP * Board specific commands
810 CONFIG_CMD_BOOTD bootd
811 CONFIG_CMD_CACHE * icache, dcache
812 CONFIG_CMD_CONSOLE coninfo
Mike Frysinger321ab9e2010-12-21 14:19:51 -0500813 CONFIG_CMD_CRC32 * crc32
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500814 CONFIG_CMD_DATE * support for RTC, date/time...
815 CONFIG_CMD_DHCP * DHCP support
816 CONFIG_CMD_DIAG * Diagnostics
Peter Tyser15258042008-12-17 16:36:22 -0600817 CONFIG_CMD_DS4510 * ds4510 I2C gpio commands
818 CONFIG_CMD_DS4510_INFO * ds4510 I2C info command
819 CONFIG_CMD_DS4510_MEM * ds4510 I2C eeprom/sram commansd
820 CONFIG_CMD_DS4510_RST * ds4510 I2C rst command
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500821 CONFIG_CMD_DTT * Digital Therm and Thermostat
822 CONFIG_CMD_ECHO echo arguments
Peter Tyser0deafa22009-10-25 15:12:56 -0500823 CONFIG_CMD_EDITENV edit env variable
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500824 CONFIG_CMD_EEPROM * EEPROM read/write support
825 CONFIG_CMD_ELF * bootelf, bootvx
Joe Hershberger1b0d5512012-12-11 22:16:25 -0600826 CONFIG_CMD_ENV_CALLBACK * display details about env callbacks
Joe Hershbergera2d62b72012-12-11 22:16:33 -0600827 CONFIG_CMD_ENV_FLAGS * display details about env flags
Mike Frysingerf3ddf202010-12-26 23:09:45 -0500828 CONFIG_CMD_EXPORTENV * export the environment
Stephen Warren4f8662d2012-10-22 06:43:50 +0000829 CONFIG_CMD_EXT2 * ext2 command support
830 CONFIG_CMD_EXT4 * ext4 command support
Mike Frysinger78dcaf42009-01-28 19:08:14 -0500831 CONFIG_CMD_SAVEENV saveenv
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500832 CONFIG_CMD_FDC * Floppy Disk Support
Stephen Warren4f8662d2012-10-22 06:43:50 +0000833 CONFIG_CMD_FAT * FAT command support
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500834 CONFIG_CMD_FDOS * Dos diskette Support
835 CONFIG_CMD_FLASH flinfo, erase, protect
836 CONFIG_CMD_FPGA FPGA device initialization support
Anton Staafd1390c82012-12-05 14:46:29 +0000837 CONFIG_CMD_GETTIME * Get time since boot
Mike Frysinger2ed02412010-12-26 23:32:22 -0500838 CONFIG_CMD_GO * the 'go' command (exec code)
Kim Phillipsf0c9d532011-04-05 07:15:14 +0000839 CONFIG_CMD_GREPENV * search environment
Simon Glass058bb8d2012-12-05 14:46:38 +0000840 CONFIG_CMD_HASH * calculate hash / digest
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500841 CONFIG_CMD_HWFLOW * RTS/CTS hw flow control
842 CONFIG_CMD_I2C * I2C serial bus support
843 CONFIG_CMD_IDE * IDE harddisk support
844 CONFIG_CMD_IMI iminfo
Vipin Kumar3df41b12012-12-16 22:32:48 +0000845 CONFIG_CMD_IMLS List all images found in NOR flash
846 CONFIG_CMD_IMLS_NAND List all images found in NAND flash
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500847 CONFIG_CMD_IMMAP * IMMR dump support
Mike Frysingerf3ddf202010-12-26 23:09:45 -0500848 CONFIG_CMD_IMPORTENV * import an environment
Joe Hershberger0fd32d72012-10-03 11:15:51 +0000849 CONFIG_CMD_INI * import data from an ini file into the env
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500850 CONFIG_CMD_IRQ * irqinfo
851 CONFIG_CMD_ITEST Integer/string test of 2 values
852 CONFIG_CMD_JFFS2 * JFFS2 Support
853 CONFIG_CMD_KGDB * kgdb
Mike Frysingerfc6508a2010-12-26 12:34:49 -0500854 CONFIG_CMD_LDRINFO ldrinfo (display Blackfin loader)
Joe Hershbergerb35a3a62012-05-23 08:00:12 +0000855 CONFIG_CMD_LINK_LOCAL * link-local IP address auto-configuration
856 (169.254.*.*)
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500857 CONFIG_CMD_LOADB loadb
858 CONFIG_CMD_LOADS loads
Robin Getz93d6cb02009-07-27 00:07:59 -0400859 CONFIG_CMD_MD5SUM print md5 message digest
860 (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
Simon Glasseacd14f2012-11-30 13:01:20 +0000861 CONFIG_CMD_MEMINFO * Display detailed memory information
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500862 CONFIG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base,
863 loop, loopw, mtest
864 CONFIG_CMD_MISC Misc functions like sleep etc
865 CONFIG_CMD_MMC * MMC memory mapped support
866 CONFIG_CMD_MII * MII utility commands
Stefan Roeseb1423dd2009-03-19 13:30:36 +0100867 CONFIG_CMD_MTDPARTS * MTD partition support
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500868 CONFIG_CMD_NAND * NAND support
869 CONFIG_CMD_NET bootp, tftpboot, rarpboot
Peter Tyser9902e422008-12-17 16:36:21 -0600870 CONFIG_CMD_PCA953X * PCA953x I2C gpio commands
Wolfgang Denk092ae952011-10-26 10:21:21 +0000871 CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500872 CONFIG_CMD_PCI * pciinfo
873 CONFIG_CMD_PCMCIA * PCMCIA support
874 CONFIG_CMD_PING * send ICMP ECHO_REQUEST to network
875 host
876 CONFIG_CMD_PORTIO * Port I/O
Kenneth Watersc889fb42012-12-05 14:46:30 +0000877 CONFIG_CMD_READ * Read raw data from partition
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500878 CONFIG_CMD_REGINFO * Register dump
879 CONFIG_CMD_RUN run command in env variable
Simon Glassbf6ce792012-12-26 09:53:36 +0000880 CONFIG_CMD_SANDBOX * sb command to access sandbox features
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500881 CONFIG_CMD_SAVES * save S record dump
882 CONFIG_CMD_SCSI * SCSI Support
883 CONFIG_CMD_SDRAM * print SDRAM configuration information
884 (requires CONFIG_CMD_I2C)
885 CONFIG_CMD_SETGETDCR Support for DCR Register access
886 (4xx only)
Eric Nelson97f5f8f2012-01-31 10:52:08 -0700887 CONFIG_CMD_SF * Read/write/erase SPI NOR flash
Alexander Holler37ef5392011-01-18 09:48:08 +0100888 CONFIG_CMD_SHA1SUM print sha1 memory digest
Robin Getz93d6cb02009-07-27 00:07:59 -0400889 (requires CONFIG_CMD_MEMORY)
Wolfgang Denk85c25df2009-04-01 23:34:12 +0200890 CONFIG_CMD_SOURCE "source" command Support
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500891 CONFIG_CMD_SPI * SPI serial bus support
Luca Ceresoli7aa81a42011-05-17 00:03:40 +0000892 CONFIG_CMD_TFTPSRV * TFTP transfer in server mode
Simon Glass6a398d22011-10-24 18:00:07 +0000893 CONFIG_CMD_TFTPPUT * TFTP put command (upload)
Joe Hershberger59f3f522012-10-03 12:14:57 +0000894 CONFIG_CMD_TIME * run command and report execution time (ARM specific)
895 CONFIG_CMD_TIMER * access to the system tick timer
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500896 CONFIG_CMD_USB * USB support
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500897 CONFIG_CMD_CDP * Cisco Discover Protocol support
Marek Vasut71729392012-03-31 07:47:16 +0000898 CONFIG_CMD_MFSL * Microblaze FSL support
wdenkc6097192002-11-03 00:24:07 +0000899
wdenkc6097192002-11-03 00:24:07 +0000900
901 EXAMPLE: If you want all functions except of network
902 support you can write:
903
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500904 #include "config_cmd_all.h"
905 #undef CONFIG_CMD_NET
wdenkc6097192002-11-03 00:24:07 +0000906
Gerald Van Barend6abef42007-03-31 12:23:51 -0400907 Other Commands:
908 fdt (flattened device tree) command: CONFIG_OF_LIBFDT
wdenkc6097192002-11-03 00:24:07 +0000909
910 Note: Don't enable the "icache" and "dcache" commands
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500911 (configuration option CONFIG_CMD_CACHE) unless you know
wdenk4a5c8a72003-03-06 00:02:04 +0000912 what you (and your U-Boot users) are doing. Data
913 cache cannot be enabled on systems like the 8xx or
914 8260 (where accesses to the IMMR region must be
915 uncached), and it cannot be disabled on all other
916 systems where we (mis-) use the data cache to hold an
917 initial stack and some data.
wdenkc6097192002-11-03 00:24:07 +0000918
919
920 XXX - this list needs to get updated!
921
Simon Glass3d686442011-10-15 05:48:20 +0000922- Device tree:
923 CONFIG_OF_CONTROL
924 If this variable is defined, U-Boot will use a device tree
925 to configure its devices, instead of relying on statically
926 compiled #defines in the board file. This option is
927 experimental and only available on a few boards. The device
928 tree is available in the global data as gd->fdt_blob.
929
Simon Glass5cb34db2011-10-24 19:15:31 +0000930 U-Boot needs to get its device tree from somewhere. This can
931 be done using one of the two options below:
Simon Glass38d6b8d2011-10-15 05:48:21 +0000932
933 CONFIG_OF_EMBED
934 If this variable is defined, U-Boot will embed a device tree
935 binary in its image. This device tree file should be in the
936 board directory and called <soc>-<board>.dts. The binary file
937 is then picked up in board_init_f() and made available through
938 the global data structure as gd->blob.
Simon Glass3d686442011-10-15 05:48:20 +0000939
Simon Glass5cb34db2011-10-24 19:15:31 +0000940 CONFIG_OF_SEPARATE
941 If this variable is defined, U-Boot will build a device tree
942 binary. It will be called u-boot.dtb. Architecture-specific
943 code will locate it at run-time. Generally this works by:
944
945 cat u-boot.bin u-boot.dtb >image.bin
946
947 and in fact, U-Boot does this for you, creating a file called
948 u-boot-dtb.bin which is useful in the common case. You can
949 still use the individual files if you need something more
950 exotic.
951
wdenkc6097192002-11-03 00:24:07 +0000952- Watchdog:
953 CONFIG_WATCHDOG
954 If this variable is defined, it enables watchdog
Detlev Zundel6aa4d7b2011-04-27 05:25:59 +0000955 support for the SoC. There must be support in the SoC
956 specific code for a watchdog. For the 8xx and 8260
957 CPUs, the SIU Watchdog feature is enabled in the SYPCR
958 register. When supported for a specific SoC is
959 available, then no further board specific code should
960 be needed to use it.
961
962 CONFIG_HW_WATCHDOG
963 When using a watchdog circuitry external to the used
964 SoC, then define this variable and provide board
965 specific code for the "hw_watchdog_reset" function.
wdenkc6097192002-11-03 00:24:07 +0000966
stroeseb9c17c52003-04-04 15:53:41 +0000967- U-Boot Version:
968 CONFIG_VERSION_VARIABLE
969 If this variable is defined, an environment variable
970 named "ver" is created by U-Boot showing the U-Boot
971 version as printed by the "version" command.
Benoît Thébaudeauce9a1552012-08-13 15:01:14 +0200972 Any change to this variable will be reverted at the
973 next reset.
stroeseb9c17c52003-04-04 15:53:41 +0000974
wdenkc6097192002-11-03 00:24:07 +0000975- Real-Time Clock:
976
Jon Loeligerc1da5c92007-06-11 19:03:39 -0500977 When CONFIG_CMD_DATE is selected, the type of the RTC
wdenkc6097192002-11-03 00:24:07 +0000978 has to be selected, too. Define exactly one of the
979 following options:
980
981 CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx
982 CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC
Fabio Estevam3f8d1782011-10-24 06:44:15 +0000983 CONFIG_RTC_MC13XXX - use MC13783 or MC13892 RTC
wdenkc6097192002-11-03 00:24:07 +0000984 CONFIG_RTC_MC146818 - use MC146818 RTC
wdenk1fe2c702003-03-06 21:55:29 +0000985 CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC
wdenkc6097192002-11-03 00:24:07 +0000986 CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC
wdenk0893c472003-05-20 14:25:27 +0000987 CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC
wdenkef5fe752003-03-12 10:41:04 +0000988 CONFIG_RTC_DS164x - use Dallas DS164x RTC
Tor Krillb27939b2008-03-15 15:40:26 +0100989 CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC
wdenkaeba06f2004-06-09 17:34:58 +0000990 CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +0200991 CONFIG_SYS_RTC_DS1337_NOOSC - Turn off the OSC output for DS1337
Heiko Schocher1f1b7012011-03-28 09:24:22 +0200992 CONFIG_SYS_RV3029_TCR - enable trickle charger on
993 RV3029 RTC.
wdenkc6097192002-11-03 00:24:07 +0000994
wdenkb9bbd242003-06-30 16:24:52 +0000995 Note that if the RTC uses I2C, then the I2C interface
996 must also be configured. See I2C Support, below.
997
Peter Tyser9902e422008-12-17 16:36:21 -0600998- GPIO Support:
999 CONFIG_PCA953X - use NXP's PCA953X series I2C GPIO
1000 CONFIG_PCA953X_INFO - enable pca953x info command
1001
Chris Packham9b383202010-12-19 10:12:13 +00001002 The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of
1003 chip-ngpio pairs that tell the PCA953X driver the number of
1004 pins supported by a particular chip.
1005
Peter Tyser9902e422008-12-17 16:36:21 -06001006 Note that if the GPIO device uses I2C, then the I2C interface
1007 must also be configured. See I2C Support, below.
1008
wdenkc6097192002-11-03 00:24:07 +00001009- Timestamp Support:
1010
wdenk4a5c8a72003-03-06 00:02:04 +00001011 When CONFIG_TIMESTAMP is selected, the timestamp
1012 (date and time) of an image is printed by image
1013 commands like bootm or iminfo. This option is
Jon Loeligerc1da5c92007-06-11 19:03:39 -05001014 automatically enabled when you select CONFIG_CMD_DATE .
wdenkc6097192002-11-03 00:24:07 +00001015
Karl O. Pinc8b1f90a2012-08-16 06:20:15 +00001016- Partition Labels (disklabels) Supported:
1017 Zero or more of the following:
1018 CONFIG_MAC_PARTITION Apple's MacOS partition table.
1019 CONFIG_DOS_PARTITION MS Dos partition table, traditional on the
1020 Intel architecture, USB sticks, etc.
1021 CONFIG_ISO_PARTITION ISO partition table, used on CDROM etc.
1022 CONFIG_EFI_PARTITION GPT partition table, common when EFI is the
1023 bootloader. Note 2TB partition limit; see
1024 disk/part_efi.c
1025 CONFIG_MTD_PARTITIONS Memory Technology Device partition table.
wdenkc6097192002-11-03 00:24:07 +00001026
Wolfgang Denkb240aef2008-03-26 10:40:12 +01001027 If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
1028 CONFIG_CMD_SCSI) you must configure support for at
Karl O. Pinc8b1f90a2012-08-16 06:20:15 +00001029 least one non-MTD partition type as well.
wdenkc6097192002-11-03 00:24:07 +00001030
1031- IDE Reset method:
wdenk369d43d2004-03-14 14:09:05 +00001032 CONFIG_IDE_RESET_ROUTINE - this is defined in several
1033 board configurations files but used nowhere!
wdenkc6097192002-11-03 00:24:07 +00001034
wdenk369d43d2004-03-14 14:09:05 +00001035 CONFIG_IDE_RESET - is this is defined, IDE Reset will
1036 be performed by calling the function
1037 ide_set_reset(int reset)
1038 which has to be defined in a board specific file
wdenkc6097192002-11-03 00:24:07 +00001039
1040- ATAPI Support:
1041 CONFIG_ATAPI
1042
1043 Set this to enable ATAPI support.
1044
wdenkf602aa02004-03-13 23:29:43 +00001045- LBA48 Support
1046 CONFIG_LBA48
1047
1048 Set this to enable support for disks larger than 137GB
Heiko Schocher0f602e12009-12-03 11:21:21 +01001049 Also look at CONFIG_SYS_64BIT_LBA.
wdenkf602aa02004-03-13 23:29:43 +00001050 Whithout these , LBA48 support uses 32bit variables and will 'only'
1051 support disks up to 2.1TB.
1052
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02001053 CONFIG_SYS_64BIT_LBA:
wdenkf602aa02004-03-13 23:29:43 +00001054 When enabled, makes the IDE subsystem use 64bit sector addresses.
1055 Default is 32bit.
1056
wdenkc6097192002-11-03 00:24:07 +00001057- SCSI Support:
1058 At the moment only there is only support for the
1059 SYM53C8XX SCSI controller; define
1060 CONFIG_SCSI_SYM53C8XX to enable it.
1061
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02001062 CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
1063 CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
1064 CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
wdenkc6097192002-11-03 00:24:07 +00001065 maximum numbers of LUNs, SCSI ID's and target
1066 devices.
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02001067 CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
wdenkc6097192002-11-03 00:24:07 +00001068
Stefan Reinauere50a10e2012-10-29 05:23:48 +00001069 The environment variable 'scsidevs' is set to the number of
1070 SCSI devices found during the last scan.
1071
wdenkc6097192002-11-03 00:24:07 +00001072- NETWORK Support (PCI):
wdenk4e112c12003-06-03 23:54:09 +00001073 CONFIG_E1000
Kyle Moffett64b94dd2011-10-18 11:05:29 +00001074 Support for Intel 8254x/8257x gigabit chips.
1075
1076 CONFIG_E1000_SPI
1077 Utility code for direct access to the SPI bus on Intel 8257x.
1078 This does not do anything useful unless you set at least one
1079 of CONFIG_CMD_E1000 or CONFIG_E1000_SPI_GENERIC.
1080
1081 CONFIG_E1000_SPI_GENERIC
1082 Allow generic access to the SPI bus on the Intel 8257x, for
1083 example with the "sspi" command.
1084
1085 CONFIG_CMD_E1000
1086 Management command for E1000 devices. When used on devices
1087 with SPI support you can reprogram the EEPROM from U-Boot.
stroese94ef1cf2003-06-05 15:39:44 +00001088
Andre Schwarz68c2a302008-03-06 16:45:44 +01001089 CONFIG_E1000_FALLBACK_MAC
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02001090 default MAC for empty EEPROM after production.
Andre Schwarz68c2a302008-03-06 16:45:44 +01001091
wdenkc6097192002-11-03 00:24:07 +00001092 CONFIG_EEPRO100
1093 Support for Intel 82557/82559/82559ER chips.
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02001094 Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
wdenkc6097192002-11-03 00:24:07 +00001095 write routine for first time initialisation.
1096
1097 CONFIG_TULIP
1098 Support for Digital 2114x chips.
1099 Optional CONFIG_TULIP_SELECT_MEDIA for board specific
1100 modem chip initialisation (KS8761/QS6611).
1101
1102 CONFIG_NATSEMI
1103 Support for National dp83815 chips.
1104
1105 CONFIG_NS8382X
1106 Support for National dp8382[01] gigabit chips.
1107
wdenkaa603362003-05-12 21:50:16 +00001108- NETWORK Support (other):
1109
Jens Scharsigdab7cb82010-01-23 12:03:45 +01001110 CONFIG_DRIVER_AT91EMAC
1111 Support for AT91RM9200 EMAC.
1112
1113 CONFIG_RMII
1114 Define this to use reduced MII inteface
1115
1116 CONFIG_DRIVER_AT91EMAC_QUIET
1117 If this defined, the driver is quiet.
1118 The driver doen't show link status messages.
1119
Rob Herringc9830dc2011-12-15 11:15:49 +00001120 CONFIG_CALXEDA_XGMAC
1121 Support for the Calxeda XGMAC device
1122
Ashok93fb8722012-10-15 06:20:47 +00001123 CONFIG_LAN91C96
wdenkaa603362003-05-12 21:50:16 +00001124 Support for SMSC's LAN91C96 chips.
1125
1126 CONFIG_LAN91C96_BASE
1127 Define this to hold the physical address
1128 of the LAN91C96's I/O space
1129
1130 CONFIG_LAN91C96_USE_32_BIT
1131 Define this to enable 32 bit addressing
1132
Ashok93fb8722012-10-15 06:20:47 +00001133 CONFIG_SMC91111
wdenk3c711762004-06-09 13:37:52 +00001134 Support for SMSC's LAN91C111 chip
1135
1136 CONFIG_SMC91111_BASE
1137 Define this to hold the physical address
1138 of the device (I/O space)
1139
1140 CONFIG_SMC_USE_32_BIT
1141 Define this if data bus is 32 bits
1142
1143 CONFIG_SMC_USE_IOFUNCS
1144 Define this to use i/o functions instead of macros
1145 (some hardware wont work with macros)
1146
Heiko Schocher7d037f72011-11-15 10:00:04 -05001147 CONFIG_DRIVER_TI_EMAC
1148 Support for davinci emac
1149
1150 CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT
1151 Define this if you have more then 3 PHYs.
1152
Macpaul Lin199c6252010-12-21 16:59:46 +08001153 CONFIG_FTGMAC100
1154 Support for Faraday's FTGMAC100 Gigabit SoC Ethernet
1155
1156 CONFIG_FTGMAC100_EGIGA
1157 Define this to use GE link update with gigabit PHY.
1158 Define this if FTGMAC100 is connected to gigabit PHY.
1159 If your system has 10/100 PHY only, it might not occur
1160 wrong behavior. Because PHY usually return timeout or
1161 useless data when polling gigabit status and gigabit
1162 control registers. This behavior won't affect the
1163 correctnessof 10/100 link speed update.
1164
Mike Rapoportf4761af2009-11-11 10:03:03 +02001165 CONFIG_SMC911X
Jens Gehrlein1dd48252008-05-05 14:06:11 +02001166 Support for SMSC's LAN911x and LAN921x chips
1167
Mike Rapoportf4761af2009-11-11 10:03:03 +02001168 CONFIG_SMC911X_BASE
Jens Gehrlein1dd48252008-05-05 14:06:11 +02001169 Define this to hold the physical address
1170 of the device (I/O space)
1171
Mike Rapoportf4761af2009-11-11 10:03:03 +02001172 CONFIG_SMC911X_32_BIT
Jens Gehrlein1dd48252008-05-05 14:06:11 +02001173 Define this if data bus is 32 bits
1174
Mike Rapoportf4761af2009-11-11 10:03:03 +02001175 CONFIG_SMC911X_16_BIT
Jens Gehrlein1dd48252008-05-05 14:06:11 +02001176 Define this if data bus is 16 bits. If your processor
1177 automatically converts one 32 bit word to two 16 bit
Mike Rapoportf4761af2009-11-11 10:03:03 +02001178 words you may also try CONFIG_SMC911X_32_BIT.
Jens Gehrlein1dd48252008-05-05 14:06:11 +02001179
Yoshihiro Shimodaed4cea02011-01-27 10:06:03 +09001180 CONFIG_SH_ETHER
1181 Support for Renesas on-chip Ethernet controller
1182
1183 CONFIG_SH_ETHER_USE_PORT
1184 Define the number of ports to be used
1185
1186 CONFIG_SH_ETHER_PHY_ADDR
1187 Define the ETH PHY's address
1188
Yoshihiro Shimoda281aa052011-01-27 10:06:08 +09001189 CONFIG_SH_ETHER_CACHE_WRITEBACK
1190 If this option is set, the driver enables cache flush.
1191
Vadim Bendeburydac69642011-10-17 08:36:14 +00001192- TPM Support:
1193 CONFIG_GENERIC_LPC_TPM
1194 Support for generic parallel port TPM devices. Only one device
1195 per system is supported at this time.
1196
1197 CONFIG_TPM_TIS_BASE_ADDRESS
1198 Base address where the generic TPM device is mapped
1199 to. Contemporary x86 systems usually map it at
1200 0xfed40000.
1201
wdenkc6097192002-11-03 00:24:07 +00001202- USB Support:
1203 At the moment only the UHCI host controller is
wdenk369d43d2004-03-14 14:09:05 +00001204 supported (PIP405, MIP405, MPC5200); define
wdenkc6097192002-11-03 00:24:07 +00001205 CONFIG_USB_UHCI to enable it.
1206 define CONFIG_USB_KEYBOARD to enable the USB Keyboard
wdenkfb30b4c2004-10-09 22:44:59 +00001207 and define CONFIG_USB_STORAGE to enable the USB
wdenkc6097192002-11-03 00:24:07 +00001208 storage devices.
1209 Note:
1210 Supported are USB Keyboards and USB Floppy drives
1211 (TEAC FD-05PUB).
wdenk369d43d2004-03-14 14:09:05 +00001212 MPC5200 USB requires additional defines:
1213 CONFIG_USB_CLOCK
1214 for 528 MHz Clock: 0x0001bbbb
Eric Millbrandt02848522009-08-13 08:32:37 -05001215 CONFIG_PSC3_USB
1216 for USB on PSC3
wdenk369d43d2004-03-14 14:09:05 +00001217 CONFIG_USB_CONFIG
1218 for differential drivers: 0x00001000
1219 for single ended drivers: 0x00005000
Eric Millbrandt02848522009-08-13 08:32:37 -05001220 for differential drivers on PSC3: 0x00000100
1221 for single ended drivers on PSC3: 0x00004100
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02001222 CONFIG_SYS_USB_EVENT_POLL
Zhang Wei063f9ff2007-06-06 10:08:13 +02001223 May be defined to allow interrupt polling
1224 instead of using asynchronous interrupts
wdenk369d43d2004-03-14 14:09:05 +00001225
Simon Glass5978cdb2012-02-27 10:52:47 +00001226 CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the
1227 txfilltuning field in the EHCI controller on reset.
1228
Wolfgang Denk3f0137b2006-06-14 17:45:53 +02001229- USB Device:
1230 Define the below if you wish to use the USB console.
1231 Once firmware is rebuilt from a serial console issue the
1232 command "setenv stdin usbtty; setenv stdout usbtty" and
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02001233 attach your USB cable. The Unix command "dmesg" should print
Wolfgang Denk3f0137b2006-06-14 17:45:53 +02001234 it has found a new device. The environment variable usbtty
1235 can be set to gserial or cdc_acm to enable your device to
Wolfgang Denke2601822006-06-14 18:14:56 +02001236 appear to a USB host as a Linux gserial device or a
Wolfgang Denk3f0137b2006-06-14 17:45:53 +02001237 Common Device Class Abstract Control Model serial device.
1238 If you select usbtty = gserial you should be able to enumerate
1239 a Linux host by
1240 # modprobe usbserial vendor=0xVendorID product=0xProductID
1241 else if using cdc_acm, simply setting the environment
1242 variable usbtty to be cdc_acm should suffice. The following
1243 might be defined in YourBoardName.h
Wolfgang Denke2601822006-06-14 18:14:56 +02001244
Wolfgang Denk3f0137b2006-06-14 17:45:53 +02001245 CONFIG_USB_DEVICE
1246 Define this to build a UDC device
1247
1248 CONFIG_USB_TTY
1249 Define this to have a tty type of device available to
1250 talk to the UDC device
Wolfgang Denke2601822006-06-14 18:14:56 +02001251
Vipin KUMARbdb17702012-03-26 15:38:06 +05301252 CONFIG_USBD_HS
1253 Define this to enable the high speed support for usb
1254 device and usbtty. If this feature is enabled, a routine
1255 int is_usbd_high_speed(void)
1256 also needs to be defined by the driver to dynamically poll
1257 whether the enumeration has succeded at high speed or full
1258 speed.
1259
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02001260 CONFIG_SYS_CONSOLE_IS_IN_ENV
Wolfgang Denk3f0137b2006-06-14 17:45:53 +02001261 Define this if you want stdin, stdout &/or stderr to
1262 be set to usbtty.
1263
1264 mpc8xx:
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02001265 CONFIG_SYS_USB_EXTC_CLK 0xBLAH
Wolfgang Denk3f0137b2006-06-14 17:45:53 +02001266 Derive USB clock from external clock "blah"
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02001267 - CONFIG_SYS_USB_EXTC_CLK 0x02
Wolfgang Denke2601822006-06-14 18:14:56 +02001268
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02001269 CONFIG_SYS_USB_BRG_CLK 0xBLAH
Wolfgang Denk3f0137b2006-06-14 17:45:53 +02001270 Derive USB clock from brgclk
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02001271 - CONFIG_SYS_USB_BRG_CLK 0x04
Wolfgang Denk3f0137b2006-06-14 17:45:53 +02001272
Wolfgang Denke2601822006-06-14 18:14:56 +02001273 If you have a USB-IF assigned VendorID then you may wish to
Wolfgang Denk3f0137b2006-06-14 17:45:53 +02001274 define your own vendor specific values either in BoardName.h
Wolfgang Denke2601822006-06-14 18:14:56 +02001275 or directly in usbd_vendor_info.h. If you don't define
Wolfgang Denk3f0137b2006-06-14 17:45:53 +02001276 CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
1277 CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
1278 should pretend to be a Linux device to it's target host.
1279
1280 CONFIG_USBD_MANUFACTURER
1281 Define this string as the name of your company for
1282 - CONFIG_USBD_MANUFACTURER "my company"
Wolfgang Denke2601822006-06-14 18:14:56 +02001283
Wolfgang Denk3f0137b2006-06-14 17:45:53 +02001284 CONFIG_USBD_PRODUCT_NAME
1285 Define this string as the name of your product
1286 - CONFIG_USBD_PRODUCT_NAME "acme usb device"
wdenkc6097192002-11-03 00:24:07 +00001287
Wolfgang Denk3f0137b2006-06-14 17:45:53 +02001288 CONFIG_USBD_VENDORID
1289 Define this as your assigned Vendor ID from the USB
1290 Implementors Forum. This *must* be a genuine Vendor ID
1291 to avoid polluting the USB namespace.
1292 - CONFIG_USBD_VENDORID 0xFFFF
Wolfgang Denke2601822006-06-14 18:14:56 +02001293
Wolfgang Denk3f0137b2006-06-14 17:45:53 +02001294 CONFIG_USBD_PRODUCTID
1295 Define this as the unique Product ID
1296 for your device
1297 - CONFIG_USBD_PRODUCTID 0xFFFF
Wolfgang Denke2601822006-06-14 18:14:56 +02001298
Igor Grinbergac5f6ee2011-12-12 12:08:35 +02001299- ULPI Layer Support:
1300 The ULPI (UTMI Low Pin (count) Interface) PHYs are supported via
1301 the generic ULPI layer. The generic layer accesses the ULPI PHY
1302 via the platform viewport, so you need both the genric layer and
1303 the viewport enabled. Currently only Chipidea/ARC based
1304 viewport is supported.
1305 To enable the ULPI layer support, define CONFIG_USB_ULPI and
1306 CONFIG_USB_ULPI_VIEWPORT in your board configuration file.
Lucas Stachf31e4112012-10-01 00:44:35 +02001307 If your ULPI phy needs a different reference clock than the
1308 standard 24 MHz then you have to define CONFIG_ULPI_REF_CLK to
1309 the appropriate value in Hz.
wdenkc6097192002-11-03 00:24:07 +00001310
wdenk7a428cc2003-06-15 22:40:42 +00001311- MMC Support:
wdenk57b2d802003-06-27 21:31:46 +00001312 The MMC controller on the Intel PXA is supported. To
1313 enable this define CONFIG_MMC. The MMC can be
1314 accessed from the boot prompt by mapping the device
wdenk7a428cc2003-06-15 22:40:42 +00001315 to physical memory similar to flash. Command line is
Jon Loeligerc1da5c92007-06-11 19:03:39 -05001316 enabled with CONFIG_CMD_MMC. The MMC driver also works with
1317 the FAT fs. This is enabled with CONFIG_CMD_FAT.
wdenk7a428cc2003-06-15 22:40:42 +00001318
Yoshihiro Shimodadb7717b2011-07-04 22:21:22 +00001319 CONFIG_SH_MMCIF
1320 Support for Renesas on-chip MMCIF controller
1321
1322 CONFIG_SH_MMCIF_ADDR
1323 Define the base address of MMCIF registers
1324
1325 CONFIG_SH_MMCIF_CLK
1326 Define the clock frequency for MMCIF
1327
wdenkda04a8b2004-08-02 23:22:59 +00001328- Journaling Flash filesystem support:
1329 CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
1330 CONFIG_JFFS2_NAND_DEV
1331 Define these for a default partition on a NAND device
1332
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02001333 CONFIG_SYS_JFFS2_FIRST_SECTOR,
1334 CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
wdenkda04a8b2004-08-02 23:22:59 +00001335 Define these for a default partition on a NOR device
1336
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02001337 CONFIG_SYS_JFFS_CUSTOM_PART
wdenkda04a8b2004-08-02 23:22:59 +00001338 Define this to create an own partition. You have to provide a
1339 function struct part_info* jffs2_part_info(int part_num)
1340
1341 If you define only one JFFS2 partition you may also want to
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02001342 #define CONFIG_SYS_JFFS_SINGLE_PART 1
wdenkda04a8b2004-08-02 23:22:59 +00001343 to disable the command chpart. This is the default when you
1344 have not defined a custom partition
1345
Donggeun Kim8f814002011-10-24 21:15:28 +00001346- FAT(File Allocation Table) filesystem write function support:
1347 CONFIG_FAT_WRITE
Donggeun Kimb44c8ab2012-03-22 04:38:56 +00001348
1349 Define this to enable support for saving memory data as a
1350 file in FAT formatted partition.
1351
1352 This will also enable the command "fatwrite" enabling the
1353 user to write files to FAT.
Donggeun Kim8f814002011-10-24 21:15:28 +00001354
Gabe Black7f8574c2012-10-12 14:26:11 +00001355CBFS (Coreboot Filesystem) support
1356 CONFIG_CMD_CBFS
1357
1358 Define this to enable support for reading from a Coreboot
1359 filesystem. Available commands are cbfsinit, cbfsinfo, cbfsls
1360 and cbfsload.
1361
wdenkc6097192002-11-03 00:24:07 +00001362- Keyboard Support:
1363 CONFIG_ISA_KEYBOARD
1364
1365 Define this to enable standard (PC-Style) keyboard
1366 support
1367
1368 CONFIG_I8042_KBD
1369 Standard PC keyboard driver with US (is default) and
1370 GERMAN key layout (switch via environment 'keymap=de') support.
1371 Export function i8042_kbd_init, i8042_tstc and i8042_getc
1372 for cfb_console. Supports cursor blinking.
1373
1374- Video support:
1375 CONFIG_VIDEO
1376
1377 Define this to enable video support (for output to
1378 video).
1379
1380 CONFIG_VIDEO_CT69000
1381
1382 Enable Chips & Technologies 69000 Video chip
1383
1384 CONFIG_VIDEO_SMI_LYNXEM
wdenkd3602132004-03-25 15:14:43 +00001385 Enable Silicon Motion SMI 712/710/810 Video chip. The
wdenkaea86e42004-03-23 22:53:55 +00001386 video output is selected via environment 'videoout'
1387 (1 = LCD and 2 = CRT). If videoout is undefined, CRT is
1388 assumed.
wdenkc6097192002-11-03 00:24:07 +00001389
wdenkd3602132004-03-25 15:14:43 +00001390 For the CT69000 and SMI_LYNXEM drivers, videomode is
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02001391 selected via environment 'videomode'. Two different ways
wdenkaea86e42004-03-23 22:53:55 +00001392 are possible:
1393 - "videomode=num" 'num' is a standard LiLo mode numbers.
wdenk05939202004-04-18 17:39:38 +00001394 Following standard modes are supported (* is default):
wdenkaea86e42004-03-23 22:53:55 +00001395
1396 Colors 640x480 800x600 1024x768 1152x864 1280x1024
1397 -------------+---------------------------------------------
1398 8 bits | 0x301* 0x303 0x305 0x161 0x307
1399 15 bits | 0x310 0x313 0x316 0x162 0x319
1400 16 bits | 0x311 0x314 0x317 0x163 0x31A
1401 24 bits | 0x312 0x315 0x318 ? 0x31B
1402 -------------+---------------------------------------------
wdenkc6097192002-11-03 00:24:07 +00001403 (i.e. setenv videomode 317; saveenv; reset;)
1404
wdenkd3602132004-03-25 15:14:43 +00001405 - "videomode=bootargs" all the video parameters are parsed
Marcel Ziswileraea68562007-12-30 03:30:46 +01001406 from the bootargs. (See drivers/video/videomodes.c)
wdenkaea86e42004-03-23 22:53:55 +00001407
1408
stroeseb9c17c52003-04-04 15:53:41 +00001409 CONFIG_VIDEO_SED13806
wdenk4a5c8a72003-03-06 00:02:04 +00001410 Enable Epson SED13806 driver. This driver supports 8bpp
wdenk9dd2b882002-12-03 21:28:10 +00001411 and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
1412 or CONFIG_VIDEO_SED13806_16BPP
1413
Timur Tabi020edd22011-02-15 17:09:19 -06001414 CONFIG_FSL_DIU_FB
Wolfgang Denk825223d2011-09-11 21:24:09 +02001415 Enable the Freescale DIU video driver. Reference boards for
Timur Tabi020edd22011-02-15 17:09:19 -06001416 SOCs that have a DIU should define this macro to enable DIU
1417 support, and should also define these other macros:
1418
1419 CONFIG_SYS_DIU_ADDR
1420 CONFIG_VIDEO
1421 CONFIG_CMD_BMP
1422 CONFIG_CFB_CONSOLE
1423 CONFIG_VIDEO_SW_CURSOR
1424 CONFIG_VGA_AS_SINGLE_DEVICE
1425 CONFIG_VIDEO_LOGO
1426 CONFIG_VIDEO_BMP_LOGO
1427
Timur Tabi32f709e2011-04-11 14:18:22 -05001428 The DIU driver will look for the 'video-mode' environment
1429 variable, and if defined, enable the DIU as a console during
1430 boot. See the documentation file README.video for a
1431 description of this variable.
Timur Tabi020edd22011-02-15 17:09:19 -06001432
Simon Glass54df8ce2012-12-03 13:59:47 +00001433 CONFIG_VIDEO_VGA
1434
1435 Enable the VGA video / BIOS for x86. The alternative if you
1436 are using coreboot is to use the coreboot frame buffer
1437 driver.
1438
1439
wdenk4e112c12003-06-03 23:54:09 +00001440- Keyboard Support:
wdenk57b2d802003-06-27 21:31:46 +00001441 CONFIG_KEYBOARD
wdenk4e112c12003-06-03 23:54:09 +00001442
wdenk57b2d802003-06-27 21:31:46 +00001443 Define this to enable a custom keyboard support.
1444 This simply calls drv_keyboard_init() which must be
1445 defined in your board-specific files.
1446 The only board using this so far is RBC823.
wdenk9dd2b882002-12-03 21:28:10 +00001447
wdenkc6097192002-11-03 00:24:07 +00001448- LCD Support: CONFIG_LCD
1449
1450 Define this to enable LCD support (for output to LCD
1451 display); also select one of the supported displays
1452 by defining one of these:
1453
Stelian Popf6f86652008-05-09 21:57:18 +02001454 CONFIG_ATMEL_LCD:
1455
1456 HITACHI TX09D70VM1CCA, 3.5", 240x320.
1457
wdenkc0d54ae2003-11-25 16:55:19 +00001458 CONFIG_NEC_NL6448AC33:
wdenkc6097192002-11-03 00:24:07 +00001459
wdenkc0d54ae2003-11-25 16:55:19 +00001460 NEC NL6448AC33-18. Active, color, single scan.
wdenkc6097192002-11-03 00:24:07 +00001461
wdenkc0d54ae2003-11-25 16:55:19 +00001462 CONFIG_NEC_NL6448BC20
1463
1464 NEC NL6448BC20-08. 6.5", 640x480.
1465 Active, color, single scan.
1466
1467 CONFIG_NEC_NL6448BC33_54
wdenkc6097192002-11-03 00:24:07 +00001468
wdenkc0d54ae2003-11-25 16:55:19 +00001469 NEC NL6448BC33-54. 10.4", 640x480.
wdenkc6097192002-11-03 00:24:07 +00001470 Active, color, single scan.
1471
1472 CONFIG_SHARP_16x9
1473
1474 Sharp 320x240. Active, color, single scan.
1475 It isn't 16x9, and I am not sure what it is.
1476
1477 CONFIG_SHARP_LQ64D341
1478
1479 Sharp LQ64D341 display, 640x480.
1480 Active, color, single scan.
1481
1482 CONFIG_HLD1045
1483
1484 HLD1045 display, 640x480.
1485 Active, color, single scan.
1486
1487 CONFIG_OPTREX_BW
1488
1489 Optrex CBL50840-2 NF-FW 99 22 M5
1490 or
1491 Hitachi LMG6912RPFC-00T
1492 or
1493 Hitachi SP14Q002
1494
1495 320x240. Black & white.
1496
1497 Normally display is black on white background; define
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02001498 CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
wdenkc6097192002-11-03 00:24:07 +00001499
Simon Glass599a4df2012-10-17 13:24:54 +00001500 CONFIG_LCD_ALIGNMENT
1501
1502 Normally the LCD is page-aligned (tyically 4KB). If this is
1503 defined then the LCD will be aligned to this value instead.
1504 For ARM it is sometimes useful to use MMU_SECTION_SIZE
1505 here, since it is cheaper to change data cache settings on
1506 a per-section basis.
1507
Simon Glassaf3e2802012-10-17 13:24:59 +00001508 CONFIG_CONSOLE_SCROLL_LINES
1509
1510 When the console need to be scrolled, this is the number of
1511 lines to scroll by. It defaults to 1. Increasing this makes
1512 the console jump but can help speed up operation when scrolling
1513 is slow.
Simon Glass599a4df2012-10-17 13:24:54 +00001514
Tom Wai-Hong Tam79926a42012-09-28 15:11:16 +00001515 CONFIG_LCD_BMP_RLE8
1516
1517 Support drawing of RLE8-compressed bitmaps on the LCD.
1518
Tom Wai-Hong Tam6664f202012-12-05 14:46:40 +00001519 CONFIG_I2C_EDID
1520
1521 Enables an 'i2c edid' command which can read EDID
1522 information over I2C from an attached LCD display.
1523
wdenkeb20ad32003-09-05 23:19:14 +00001524- Splash Screen Support: CONFIG_SPLASH_SCREEN
wdenk92bbe3f2003-04-20 14:04:18 +00001525
wdenk57b2d802003-06-27 21:31:46 +00001526 If this option is set, the environment is checked for
1527 a variable "splashimage". If found, the usual display
1528 of logo, copyright and system information on the LCD
wdenk01686632004-06-30 22:59:18 +00001529 is suppressed and the BMP image at the address
wdenk57b2d802003-06-27 21:31:46 +00001530 specified in "splashimage" is loaded instead. The
1531 console is redirected to the "nulldev", too. This
1532 allows for a "silent" boot where a splash screen is
1533 loaded very quickly after power-on.
wdenk92bbe3f2003-04-20 14:04:18 +00001534
Matthias Weisser53884182009-07-09 16:07:30 +02001535 CONFIG_SPLASH_SCREEN_ALIGN
1536
1537 If this option is set the splash image can be freely positioned
1538 on the screen. Environment variable "splashpos" specifies the
1539 position as "x,y". If a positive number is given it is used as
1540 number of pixel from left/top. If a negative number is given it
1541 is used as number of pixel from right/bottom. You can also
1542 specify 'm' for centering the image.
1543
1544 Example:
1545 setenv splashpos m,m
1546 => image at center of screen
1547
1548 setenv splashpos 30,20
1549 => image at x = 30 and y = 20
1550
1551 setenv splashpos -10,m
1552 => vertically centered image
1553 at x = dspWidth - bmpWidth - 9
1554
Stefan Roesed9d97742005-09-22 09:04:17 +02001555- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
1556
1557 If this option is set, additionally to standard BMP
1558 images, gzipped BMP images can be displayed via the
1559 splashscreen support or the bmp command.
1560
Anatolij Gustschin6b4e4fc2010-03-15 14:50:25 +01001561- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
1562
1563 If this option is set, 8-bit RLE compressed BMP images
1564 can be displayed via the splashscreen support or the
1565 bmp command.
1566
Lei Wene4e248d2012-09-28 04:26:47 +00001567- Do compresssing for memory range:
1568 CONFIG_CMD_ZIP
1569
1570 If this option is set, it would use zlib deflate method
1571 to compress the specified memory at its best effort.
1572
wdenk710e3502003-08-29 20:57:53 +00001573- Compression support:
1574 CONFIG_BZIP2
1575
1576 If this option is set, support for bzip2 compressed
1577 images is included. If not, only uncompressed and gzip
1578 compressed images are supported.
1579
wdenk9c53f402003-10-15 23:53:47 +00001580 NOTE: the bzip2 algorithm requires a lot of RAM, so
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02001581 the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
wdenk9c53f402003-10-15 23:53:47 +00001582 be at least 4MB.
wdenk92bbe3f2003-04-20 14:04:18 +00001583
Luigi 'Comio' Mantellini35afc062008-09-08 02:46:13 +02001584 CONFIG_LZMA
1585
1586 If this option is set, support for lzma compressed
1587 images is included.
1588
1589 Note: The LZMA algorithm adds between 2 and 4KB of code and it
1590 requires an amount of dynamic memory that is given by the
1591 formula:
1592
1593 (1846 + 768 << (lc + lp)) * sizeof(uint16)
1594
1595 Where lc and lp stand for, respectively, Literal context bits
1596 and Literal pos bits.
1597
1598 This value is upper-bounded by 14MB in the worst case. Anyway,
1599 for a ~4MB large kernel image, we have lc=3 and lp=0 for a
1600 total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
1601 a very small buffer.
1602
1603 Use the lzmainfo tool to determinate the lc and lp values and
1604 then calculate the amount of needed dynamic memory (ensuring
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02001605 the appropriate CONFIG_SYS_MALLOC_LEN value).
Luigi 'Comio' Mantellini35afc062008-09-08 02:46:13 +02001606
wdenk0e2bd9c2004-06-06 21:51:03 +00001607- MII/PHY support:
1608 CONFIG_PHY_ADDR
1609
1610 The address of PHY on MII bus.
1611
1612 CONFIG_PHY_CLOCK_FREQ (ppc4xx)
1613
1614 The clock frequency of the MII bus
1615
1616 CONFIG_PHY_GIGE
1617
1618 If this option is set, support for speed/duplex
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02001619 detection of gigabit PHY is included.
wdenk0e2bd9c2004-06-06 21:51:03 +00001620
1621 CONFIG_PHY_RESET_DELAY
1622
1623 Some PHY like Intel LXT971A need extra delay after
1624 reset before any MII register access is possible.
1625 For such PHY, set this option to the usec delay
1626 required. (minimum 300usec for LXT971A)
1627
1628 CONFIG_PHY_CMD_DELAY (ppc4xx)
1629
1630 Some PHY like Intel LXT971A need extra delay after
1631 command issued before MII status register can be read
1632
wdenkc6097192002-11-03 00:24:07 +00001633- Ethernet address:
1634 CONFIG_ETHADDR
richardretanubune5167f12008-09-29 18:28:23 -04001635 CONFIG_ETH1ADDR
wdenkc6097192002-11-03 00:24:07 +00001636 CONFIG_ETH2ADDR
1637 CONFIG_ETH3ADDR
richardretanubune5167f12008-09-29 18:28:23 -04001638 CONFIG_ETH4ADDR
1639 CONFIG_ETH5ADDR
wdenkc6097192002-11-03 00:24:07 +00001640
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02001641 Define a default value for Ethernet address to use
1642 for the respective Ethernet interface, in case this
wdenkc6097192002-11-03 00:24:07 +00001643 is not determined automatically.
1644
1645- IP address:
1646 CONFIG_IPADDR
1647
1648 Define a default value for the IP address to use for
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02001649 the default Ethernet interface, in case this is not
wdenkc6097192002-11-03 00:24:07 +00001650 determined through e.g. bootp.
Wolfgang Denk26da2992011-10-26 10:21:22 +00001651 (Environment variable "ipaddr")
wdenkc6097192002-11-03 00:24:07 +00001652
1653- Server IP address:
1654 CONFIG_SERVERIP
1655
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02001656 Defines a default value for the IP address of a TFTP
wdenkc6097192002-11-03 00:24:07 +00001657 server to contact when using the "tftboot" command.
Wolfgang Denk26da2992011-10-26 10:21:22 +00001658 (Environment variable "serverip")
wdenkc6097192002-11-03 00:24:07 +00001659
Robin Getz470a6d42009-07-21 12:15:28 -04001660 CONFIG_KEEP_SERVERADDR
1661
1662 Keeps the server's MAC address, in the env 'serveraddr'
1663 for passing to bootargs (like Linux's netconsole option)
1664
Wolfgang Denk26da2992011-10-26 10:21:22 +00001665- Gateway IP address:
1666 CONFIG_GATEWAYIP
1667
1668 Defines a default value for the IP address of the
1669 default router where packets to other networks are
1670 sent to.
1671 (Environment variable "gatewayip")
1672
1673- Subnet mask:
1674 CONFIG_NETMASK
1675
1676 Defines a default value for the subnet mask (or
1677 routing prefix) which is used to determine if an IP
1678 address belongs to the local subnet or needs to be
1679 forwarded through a router.
1680 (Environment variable "netmask")
1681
David Updegraff7280da72007-06-11 10:41:07 -05001682- Multicast TFTP Mode:
1683 CONFIG_MCAST_TFTP
1684
1685 Defines whether you want to support multicast TFTP as per
1686 rfc-2090; for example to work with atftp. Lets lots of targets
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02001687 tftp down the same boot image concurrently. Note: the Ethernet
David Updegraff7280da72007-06-11 10:41:07 -05001688 driver in use must provide a function: mcast() to join/leave a
1689 multicast group.
1690
wdenkc6097192002-11-03 00:24:07 +00001691- BOOTP Recovery Mode:
1692 CONFIG_BOOTP_RANDOM_DELAY
1693
1694 If you have many targets in a network that try to
1695 boot using BOOTP, you may want to avoid that all
1696 systems send out BOOTP requests at precisely the same
1697 moment (which would happen for instance at recovery
1698 from a power failure, when all systems will try to
1699 boot, thus flooding the BOOTP server. Defining
1700 CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
1701 inserted before sending out BOOTP requests. The
Wolfgang Denkb65aaf92007-08-06 23:21:05 +02001702 following delays are inserted then:
wdenkc6097192002-11-03 00:24:07 +00001703
1704 1st BOOTP request: delay 0 ... 1 sec
1705 2nd BOOTP request: delay 0 ... 2 sec
1706 3rd BOOTP request: delay 0 ... 4 sec
1707 4th and following
1708 BOOTP requests: delay 0 ... 8 sec
1709
stroesee0aadfb2003-08-28 14:17:32 +00001710- DHCP Advanced Options:
Jon Loeliger5336a762007-07-09 22:08:34 -05001711 You can fine tune the DHCP functionality by defining
1712 CONFIG_BOOTP_* symbols:
stroesee0aadfb2003-08-28 14:17:32 +00001713
Jon Loeliger5336a762007-07-09 22:08:34 -05001714 CONFIG_BOOTP_SUBNETMASK
1715 CONFIG_BOOTP_GATEWAY
1716 CONFIG_BOOTP_HOSTNAME
1717 CONFIG_BOOTP_NISDOMAIN
1718 CONFIG_BOOTP_BOOTPATH
1719 CONFIG_BOOTP_BOOTFILESIZE
1720 CONFIG_BOOTP_DNS
1721 CONFIG_BOOTP_DNS2
1722 CONFIG_BOOTP_SEND_HOSTNAME
1723 CONFIG_BOOTP_NTPSERVER
1724 CONFIG_BOOTP_TIMEOFFSET
1725 CONFIG_BOOTP_VENDOREX
Joe Hershberger8ca7fa02012-05-23 07:59:19 +00001726 CONFIG_BOOTP_MAY_FAIL
stroesee0aadfb2003-08-28 14:17:32 +00001727
Wilson Callan22bcd6e2007-07-28 10:56:13 -04001728 CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
1729 environment variable, not the BOOTP server.
stroesee0aadfb2003-08-28 14:17:32 +00001730
Joe Hershberger8ca7fa02012-05-23 07:59:19 +00001731 CONFIG_BOOTP_MAY_FAIL - If the DHCP server is not found
1732 after the configured retry count, the call will fail
1733 instead of starting over. This can be used to fail over
1734 to Link-local IP address configuration if the DHCP server
1735 is not available.
1736
stroesee0aadfb2003-08-28 14:17:32 +00001737 CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
1738 serverip from a DHCP server, it is possible that more
1739 than one DNS serverip is offered to the client.
1740 If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
1741 serverip will be stored in the additional environment
1742 variable "dnsip2". The first DNS serverip is always
1743 stored in the variable "dnsip", when CONFIG_BOOTP_DNS
Jon Loeliger5336a762007-07-09 22:08:34 -05001744 is defined.
stroesee0aadfb2003-08-28 14:17:32 +00001745
1746 CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
1747 to do a dynamic update of a DNS server. To do this, they
1748 need the hostname of the DHCP requester.
Wilson Callan22bcd6e2007-07-28 10:56:13 -04001749 If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
Jon Loeliger5336a762007-07-09 22:08:34 -05001750 of the "hostname" environment variable is passed as
1751 option 12 to the DHCP server.
stroesee0aadfb2003-08-28 14:17:32 +00001752
Aras Vaichas72aa3f32008-03-26 09:43:57 +11001753 CONFIG_BOOTP_DHCP_REQUEST_DELAY
1754
1755 A 32bit value in microseconds for a delay between
1756 receiving a "DHCP Offer" and sending the "DHCP Request".
1757 This fixes a problem with certain DHCP servers that don't
1758 respond 100% of the time to a "DHCP request". E.g. On an
1759 AT91RM9200 processor running at 180MHz, this delay needed
1760 to be *at least* 15,000 usec before a Windows Server 2003
1761 DHCP server would reply 100% of the time. I recommend at
1762 least 50,000 usec to be safe. The alternative is to hope
1763 that one of the retries will be successful but note that
1764 the DHCP timeout and retry process takes a longer than
1765 this delay.
1766
Joe Hershbergerb35a3a62012-05-23 08:00:12 +00001767 - Link-local IP address negotiation:
1768 Negotiate with other link-local clients on the local network
1769 for an address that doesn't require explicit configuration.
1770 This is especially useful if a DHCP server cannot be guaranteed
1771 to exist in all environments that the device must operate.
1772
1773 See doc/README.link-local for more information.
1774
wdenk145d2c12004-04-15 21:48:45 +00001775 - CDP Options:
wdenk05939202004-04-18 17:39:38 +00001776 CONFIG_CDP_DEVICE_ID
wdenk145d2c12004-04-15 21:48:45 +00001777
1778 The device id used in CDP trigger frames.
1779
1780 CONFIG_CDP_DEVICE_ID_PREFIX
1781
1782 A two character string which is prefixed to the MAC address
1783 of the device.
1784
1785 CONFIG_CDP_PORT_ID
1786
1787 A printf format string which contains the ascii name of
1788 the port. Normally is set to "eth%d" which sets
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02001789 eth0 for the first Ethernet, eth1 for the second etc.
wdenk145d2c12004-04-15 21:48:45 +00001790
1791 CONFIG_CDP_CAPABILITIES
1792
1793 A 32bit integer which indicates the device capabilities;
1794 0x00000010 for a normal host which does not forwards.
1795
1796 CONFIG_CDP_VERSION
1797
1798 An ascii string containing the version of the software.
1799
1800 CONFIG_CDP_PLATFORM
1801
1802 An ascii string containing the name of the platform.
1803
1804 CONFIG_CDP_TRIGGER
1805
1806 A 32bit integer sent on the trigger.
1807
1808 CONFIG_CDP_POWER_CONSUMPTION
1809
1810 A 16bit integer containing the power consumption of the
1811 device in .1 of milliwatts.
1812
1813 CONFIG_CDP_APPLIANCE_VLAN_TYPE
1814
1815 A byte containing the id of the VLAN.
1816
wdenkc6097192002-11-03 00:24:07 +00001817- Status LED: CONFIG_STATUS_LED
1818
1819 Several configurations allow to display the current
1820 status using a LED. For instance, the LED will blink
1821 fast while running U-Boot code, stop blinking as
1822 soon as a reply to a BOOTP request was received, and
1823 start blinking slow once the Linux kernel is running
1824 (supported by a status LED driver in the Linux
1825 kernel). Defining CONFIG_STATUS_LED enables this
1826 feature in U-Boot.
1827
1828- CAN Support: CONFIG_CAN_DRIVER
1829
1830 Defining CONFIG_CAN_DRIVER enables CAN driver support
1831 on those systems that support this (optional)
1832 feature, like the TQM8xxL modules.
1833
1834- I2C Support: CONFIG_HARD_I2C | CONFIG_SOFT_I2C
1835
wdenkb9bbd242003-06-30 16:24:52 +00001836 These enable I2C serial bus commands. Defining either of
wdenk21136db2003-07-16 21:53:01 +00001837 (but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02001838 include the appropriate I2C driver for the selected CPU.
wdenkc6097192002-11-03 00:24:07 +00001839
wdenk21136db2003-07-16 21:53:01 +00001840 This will allow you to use i2c commands at the u-boot
Jon Loeligerc1da5c92007-06-11 19:03:39 -05001841 command line (as long as you set CONFIG_CMD_I2C in
wdenkb9bbd242003-06-30 16:24:52 +00001842 CONFIG_COMMANDS) and communicate with i2c based realtime
1843 clock chips. See common/cmd_i2c.c for a description of the
wdenk4a5c8a72003-03-06 00:02:04 +00001844 command line interface.
wdenkc6097192002-11-03 00:24:07 +00001845
Ben Warren45657152006-09-07 16:50:54 -04001846 CONFIG_HARD_I2C selects a hardware I2C controller.
wdenkb9bbd242003-06-30 16:24:52 +00001847
wdenk21136db2003-07-16 21:53:01 +00001848 CONFIG_SOFT_I2C configures u-boot to use a software (aka
wdenkb9bbd242003-06-30 16:24:52 +00001849 bit-banging) driver instead of CPM or similar hardware
1850 support for I2C.
wdenkc6097192002-11-03 00:24:07 +00001851
wdenk21136db2003-07-16 21:53:01 +00001852 There are several other quantities that must also be
wdenkb9bbd242003-06-30 16:24:52 +00001853 defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
wdenkc6097192002-11-03 00:24:07 +00001854
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02001855 In both cases you will need to define CONFIG_SYS_I2C_SPEED
wdenk21136db2003-07-16 21:53:01 +00001856 to be the frequency (in Hz) at which you wish your i2c bus
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02001857 to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02001858 the CPU's i2c node address).
wdenk21136db2003-07-16 21:53:01 +00001859
Peter Tysere4d1abc2010-04-12 22:28:21 -05001860 Now, the u-boot i2c code for the mpc8xx
Stefan Roese88fbf932010-04-15 16:07:28 +02001861 (arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node
Peter Tysere4d1abc2010-04-12 22:28:21 -05001862 and so its address should therefore be cleared to 0 (See,
1863 eg, MPC823e User's Manual p.16-473). So, set
1864 CONFIG_SYS_I2C_SLAVE to 0.
wdenkc6097192002-11-03 00:24:07 +00001865
Eric Millbrandt12990a42009-09-03 08:09:44 -05001866 CONFIG_SYS_I2C_INIT_MPC5XXX
1867
1868 When a board is reset during an i2c bus transfer
1869 chips might think that the current transfer is still
1870 in progress. Reset the slave devices by sending start
1871 commands until the slave device responds.
1872
wdenk21136db2003-07-16 21:53:01 +00001873 That's all that's required for CONFIG_HARD_I2C.
wdenkc6097192002-11-03 00:24:07 +00001874
wdenkb9bbd242003-06-30 16:24:52 +00001875 If you use the software i2c interface (CONFIG_SOFT_I2C)
1876 then the following macros need to be defined (examples are
1877 from include/configs/lwmon.h):
wdenkc6097192002-11-03 00:24:07 +00001878
1879 I2C_INIT
1880
wdenkb9bbd242003-06-30 16:24:52 +00001881 (Optional). Any commands necessary to enable the I2C
wdenk4a5c8a72003-03-06 00:02:04 +00001882 controller or configure ports.
wdenkc6097192002-11-03 00:24:07 +00001883
wdenk544e9732004-02-06 23:19:44 +00001884 eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL)
wdenkb9bbd242003-06-30 16:24:52 +00001885
wdenkc6097192002-11-03 00:24:07 +00001886 I2C_PORT
1887
wdenk4a5c8a72003-03-06 00:02:04 +00001888 (Only for MPC8260 CPU). The I/O port to use (the code
1889 assumes both bits are on the same port). Valid values
1890 are 0..3 for ports A..D.
wdenkc6097192002-11-03 00:24:07 +00001891
1892 I2C_ACTIVE
1893
1894 The code necessary to make the I2C data line active
1895 (driven). If the data line is open collector, this
1896 define can be null.
1897
wdenkb9bbd242003-06-30 16:24:52 +00001898 eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA)
1899
wdenkc6097192002-11-03 00:24:07 +00001900 I2C_TRISTATE
1901
1902 The code necessary to make the I2C data line tri-stated
1903 (inactive). If the data line is open collector, this
1904 define can be null.
1905
wdenkb9bbd242003-06-30 16:24:52 +00001906 eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
1907
wdenkc6097192002-11-03 00:24:07 +00001908 I2C_READ
1909
1910 Code that returns TRUE if the I2C data line is high,
1911 FALSE if it is low.
1912
wdenkb9bbd242003-06-30 16:24:52 +00001913 eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
1914
wdenkc6097192002-11-03 00:24:07 +00001915 I2C_SDA(bit)
1916
1917 If <bit> is TRUE, sets the I2C data line high. If it
1918 is FALSE, it clears it (low).
1919
wdenkb9bbd242003-06-30 16:24:52 +00001920 eg: #define I2C_SDA(bit) \
wdenk2bb11052003-07-17 23:16:40 +00001921 if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \
wdenk544e9732004-02-06 23:19:44 +00001922 else immr->im_cpm.cp_pbdat &= ~PB_SDA
wdenkb9bbd242003-06-30 16:24:52 +00001923
wdenkc6097192002-11-03 00:24:07 +00001924 I2C_SCL(bit)
1925
1926 If <bit> is TRUE, sets the I2C clock line high. If it
1927 is FALSE, it clears it (low).
1928
wdenkb9bbd242003-06-30 16:24:52 +00001929 eg: #define I2C_SCL(bit) \
wdenk2bb11052003-07-17 23:16:40 +00001930 if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \
wdenk544e9732004-02-06 23:19:44 +00001931 else immr->im_cpm.cp_pbdat &= ~PB_SCL
wdenkb9bbd242003-06-30 16:24:52 +00001932
wdenkc6097192002-11-03 00:24:07 +00001933 I2C_DELAY
1934
1935 This delay is invoked four times per clock cycle so this
1936 controls the rate of data transfer. The data rate thus
wdenkb9bbd242003-06-30 16:24:52 +00001937 is 1 / (I2C_DELAY * 4). Often defined to be something
wdenk21136db2003-07-16 21:53:01 +00001938 like:
1939
wdenkb9bbd242003-06-30 16:24:52 +00001940 #define I2C_DELAY udelay(2)
wdenkc6097192002-11-03 00:24:07 +00001941
Mike Frysingeree12d542010-07-21 13:38:02 -04001942 CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA
1943
1944 If your arch supports the generic GPIO framework (asm/gpio.h),
1945 then you may alternatively define the two GPIOs that are to be
1946 used as SCL / SDA. Any of the previous I2C_xxx macros will
1947 have GPIO-based defaults assigned to them as appropriate.
1948
1949 You should define these to the GPIO value as given directly to
1950 the generic GPIO functions.
1951
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02001952 CONFIG_SYS_I2C_INIT_BOARD
wdenkcc1e2562003-03-06 13:39:27 +00001953
wdenk57b2d802003-06-27 21:31:46 +00001954 When a board is reset during an i2c bus transfer
1955 chips might think that the current transfer is still
1956 in progress. On some boards it is possible to access
1957 the i2c SCLK line directly, either by using the
1958 processor pin as a GPIO or by having a second pin
1959 connected to the bus. If this option is defined a
1960 custom i2c_init_board() routine in boards/xxx/board.c
1961 is run early in the boot sequence.
wdenkcc1e2562003-03-06 13:39:27 +00001962
Richard Retanubundf0149c2010-04-12 15:08:17 -04001963 CONFIG_SYS_I2C_BOARD_LATE_INIT
1964
1965 An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is
1966 defined a custom i2c_board_late_init() routine in
1967 boards/xxx/board.c is run AFTER the operations in i2c_init()
1968 is completed. This callpoint can be used to unreset i2c bus
1969 using CPU i2c controller register accesses for CPUs whose i2c
1970 controller provide such a method. It is called at the end of
1971 i2c_init() to allow i2c_init operations to setup the i2c bus
1972 controller on the CPU (e.g. setting bus speed & slave address).
1973
wdenk0e2bd9c2004-06-06 21:51:03 +00001974 CONFIG_I2CFAST (PPC405GP|PPC405EP only)
1975
1976 This option enables configuration of bi_iic_fast[] flags
1977 in u-boot bd_info structure based on u-boot environment
1978 variable "i2cfast". (see also i2cfast)
1979
Ben Warren45657152006-09-07 16:50:54 -04001980 CONFIG_I2C_MULTI_BUS
1981
1982 This option allows the use of multiple I2C buses, each of which
Wolfgang Denk092ae952011-10-26 10:21:21 +00001983 must have a controller. At any point in time, only one bus is
1984 active. To switch to a different bus, use the 'i2c dev' command.
Ben Warren45657152006-09-07 16:50:54 -04001985 Note that bus numbering is zero-based.
1986
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02001987 CONFIG_SYS_I2C_NOPROBES
Ben Warren45657152006-09-07 16:50:54 -04001988
1989 This option specifies a list of I2C devices that will be skipped
Wolfgang Denk092ae952011-10-26 10:21:21 +00001990 when the 'i2c probe' command is issued. If CONFIG_I2C_MULTI_BUS
Peter Tyser469cde42009-04-18 22:34:03 -05001991 is set, specify a list of bus-device pairs. Otherwise, specify
1992 a 1D array of device addresses
Ben Warren45657152006-09-07 16:50:54 -04001993
1994 e.g.
1995 #undef CONFIG_I2C_MULTI_BUS
Wolfgang Denk092ae952011-10-26 10:21:21 +00001996 #define CONFIG_SYS_I2C_NOPROBES {0x50,0x68}
Ben Warren45657152006-09-07 16:50:54 -04001997
1998 will skip addresses 0x50 and 0x68 on a board with one I2C bus
1999
Wolfgang Denk092ae952011-10-26 10:21:21 +00002000 #define CONFIG_I2C_MULTI_BUS
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002001 #define CONFIG_SYS_I2C_MULTI_NOPROBES {{0,0x50},{0,0x68},{1,0x54}}
Ben Warren45657152006-09-07 16:50:54 -04002002
2003 will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
2004
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002005 CONFIG_SYS_SPD_BUS_NUM
Timur Tabiab347542006-11-03 19:15:00 -06002006
2007 If defined, then this indicates the I2C bus number for DDR SPD.
2008 If not defined, then U-Boot assumes that SPD is on I2C bus 0.
2009
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002010 CONFIG_SYS_RTC_BUS_NUM
Stefan Roese096cc9b2007-02-20 10:51:26 +01002011
2012 If defined, then this indicates the I2C bus number for the RTC.
2013 If not defined, then U-Boot assumes that RTC is on I2C bus 0.
2014
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002015 CONFIG_SYS_DTT_BUS_NUM
Stefan Roese096cc9b2007-02-20 10:51:26 +01002016
2017 If defined, then this indicates the I2C bus number for the DTT.
2018 If not defined, then U-Boot assumes that DTT is on I2C bus 0.
2019
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002020 CONFIG_SYS_I2C_DTT_ADDR:
Victor Gallardo31856dd2008-09-09 15:13:29 -07002021
2022 If defined, specifies the I2C address of the DTT device.
2023 If not defined, then U-Boot uses predefined value for
2024 specified DTT device.
2025
Timur Tabiab347542006-11-03 19:15:00 -06002026 CONFIG_FSL_I2C
2027
2028 Define this option if you want to use Freescale's I2C driver in
Marcel Ziswileraea68562007-12-30 03:30:46 +01002029 drivers/i2c/fsl_i2c.c.
Timur Tabiab347542006-11-03 19:15:00 -06002030
Heiko Schocher6ee861b2008-10-15 09:39:47 +02002031 CONFIG_I2C_MUX
2032
2033 Define this option if you have I2C devices reached over 1 .. n
2034 I2C Muxes like the pca9544a. This option addes a new I2C
2035 Command "i2c bus [muxtype:muxaddr:muxchannel]" which adds a
2036 new I2C Bus to the existing I2C Busses. If you select the
2037 new Bus with "i2c dev", u-bbot sends first the commandos for
2038 the muxes to activate this new "bus".
2039
2040 CONFIG_I2C_MULTI_BUS must be also defined, to use this
2041 feature!
2042
2043 Example:
2044 Adding a new I2C Bus reached over 2 pca9544a muxes
2045 The First mux with address 70 and channel 6
2046 The Second mux with address 71 and channel 4
2047
2048 => i2c bus pca9544a:70:6:pca9544a:71:4
2049
2050 Use the "i2c bus" command without parameter, to get a list
2051 of I2C Busses with muxes:
2052
2053 => i2c bus
2054 Busses reached over muxes:
2055 Bus ID: 2
2056 reached over Mux(es):
2057 pca9544a@70 ch: 4
2058 Bus ID: 3
2059 reached over Mux(es):
2060 pca9544a@70 ch: 6
2061 pca9544a@71 ch: 4
2062 =>
2063
2064 If you now switch to the new I2C Bus 3 with "i2c dev 3"
Michael Jones9c5ef8d2011-07-14 22:09:28 +00002065 u-boot first sends the command to the mux@70 to enable
2066 channel 6, and then the command to the mux@71 to enable
Heiko Schocher6ee861b2008-10-15 09:39:47 +02002067 the channel 4.
2068
2069 After that, you can use the "normal" i2c commands as
Michael Jones9c5ef8d2011-07-14 22:09:28 +00002070 usual to communicate with your I2C devices behind
Heiko Schocher6ee861b2008-10-15 09:39:47 +02002071 the 2 muxes.
2072
2073 This option is actually implemented for the bitbanging
2074 algorithm in common/soft_i2c.c and for the Hardware I2C
2075 Bus on the MPC8260. But it should be not so difficult
2076 to add this option to other architectures.
2077
Andrew Dyer58c41f92008-12-29 17:36:01 -06002078 CONFIG_SOFT_I2C_READ_REPEATED_START
2079
2080 defining this will force the i2c_read() function in
2081 the soft_i2c driver to perform an I2C repeated start
2082 between writing the address pointer and reading the
2083 data. If this define is omitted the default behaviour
2084 of doing a stop-start sequence will be used. Most I2C
2085 devices can use either method, but some require one or
2086 the other.
Timur Tabiab347542006-11-03 19:15:00 -06002087
wdenkc6097192002-11-03 00:24:07 +00002088- SPI Support: CONFIG_SPI
2089
2090 Enables SPI driver (so far only tested with
2091 SPI EEPROM, also an instance works with Crystal A/D and
2092 D/As on the SACSng board)
2093
Yoshihiro Shimoda65bd9b42011-01-31 16:50:43 +09002094 CONFIG_SH_SPI
2095
2096 Enables the driver for SPI controller on SuperH. Currently
2097 only SH7757 is supported.
2098
wdenkc6097192002-11-03 00:24:07 +00002099 CONFIG_SPI_X
2100
2101 Enables extended (16-bit) SPI EEPROM addressing.
2102 (symmetrical to CONFIG_I2C_X)
2103
2104 CONFIG_SOFT_SPI
2105
wdenk4a5c8a72003-03-06 00:02:04 +00002106 Enables a software (bit-bang) SPI driver rather than
2107 using hardware support. This is a general purpose
2108 driver that only requires three general I/O port pins
2109 (two outputs, one input) to function. If this is
2110 defined, the board configuration must define several
2111 SPI configuration items (port pins to use, etc). For
2112 an example, see include/configs/sacsng.h.
wdenkc6097192002-11-03 00:24:07 +00002113
Ben Warren7efe9272008-01-16 22:37:35 -05002114 CONFIG_HARD_SPI
2115
2116 Enables a hardware SPI driver for general-purpose reads
2117 and writes. As with CONFIG_SOFT_SPI, the board configuration
2118 must define a list of chip-select function pointers.
Wolfgang Denk092ae952011-10-26 10:21:21 +00002119 Currently supported on some MPC8xxx processors. For an
Ben Warren7efe9272008-01-16 22:37:35 -05002120 example, see include/configs/mpc8349emds.h.
2121
Guennadi Liakhovetski07327a52008-04-15 14:14:25 +02002122 CONFIG_MXC_SPI
2123
2124 Enables the driver for the SPI controllers on i.MX and MXC
Fabio Estevamdcd342c2011-10-28 08:57:46 +00002125 SoCs. Currently i.MX31/35/51 are supported.
Guennadi Liakhovetski07327a52008-04-15 14:14:25 +02002126
Matthias Fuchsa4400872007-12-27 17:12:34 +01002127- FPGA Support: CONFIG_FPGA
wdenkc6097192002-11-03 00:24:07 +00002128
Matthias Fuchsa4400872007-12-27 17:12:34 +01002129 Enables FPGA subsystem.
2130
2131 CONFIG_FPGA_<vendor>
2132
2133 Enables support for specific chip vendors.
2134 (ALTERA, XILINX)
wdenkc6097192002-11-03 00:24:07 +00002135
Matthias Fuchsa4400872007-12-27 17:12:34 +01002136 CONFIG_FPGA_<family>
wdenkc6097192002-11-03 00:24:07 +00002137
Matthias Fuchsa4400872007-12-27 17:12:34 +01002138 Enables support for FPGA family.
2139 (SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
2140
2141 CONFIG_FPGA_COUNT
2142
2143 Specify the number of FPGA devices to support.
wdenkc6097192002-11-03 00:24:07 +00002144
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002145 CONFIG_SYS_FPGA_PROG_FEEDBACK
wdenkc6097192002-11-03 00:24:07 +00002146
wdenk57b2d802003-06-27 21:31:46 +00002147 Enable printing of hash marks during FPGA configuration.
wdenkc6097192002-11-03 00:24:07 +00002148
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002149 CONFIG_SYS_FPGA_CHECK_BUSY
wdenkc6097192002-11-03 00:24:07 +00002150
wdenk4a5c8a72003-03-06 00:02:04 +00002151 Enable checks on FPGA configuration interface busy
2152 status by the configuration function. This option
2153 will require a board or device specific function to
2154 be written.
wdenkc6097192002-11-03 00:24:07 +00002155
2156 CONFIG_FPGA_DELAY
2157
2158 If defined, a function that provides delays in the FPGA
2159 configuration driver.
2160
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002161 CONFIG_SYS_FPGA_CHECK_CTRLC
wdenkc6097192002-11-03 00:24:07 +00002162 Allow Control-C to interrupt FPGA configuration
2163
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002164 CONFIG_SYS_FPGA_CHECK_ERROR
wdenkc6097192002-11-03 00:24:07 +00002165
wdenk4a5c8a72003-03-06 00:02:04 +00002166 Check for configuration errors during FPGA bitfile
2167 loading. For example, abort during Virtex II
2168 configuration if the INIT_B line goes low (which
2169 indicated a CRC error).
wdenkc6097192002-11-03 00:24:07 +00002170
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002171 CONFIG_SYS_FPGA_WAIT_INIT
wdenkc6097192002-11-03 00:24:07 +00002172
wdenk4a5c8a72003-03-06 00:02:04 +00002173 Maximum time to wait for the INIT_B line to deassert
2174 after PROB_B has been deasserted during a Virtex II
2175 FPGA configuration sequence. The default time is 500
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02002176 ms.
wdenkc6097192002-11-03 00:24:07 +00002177
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002178 CONFIG_SYS_FPGA_WAIT_BUSY
wdenkc6097192002-11-03 00:24:07 +00002179
wdenk4a5c8a72003-03-06 00:02:04 +00002180 Maximum time to wait for BUSY to deassert during
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02002181 Virtex II FPGA configuration. The default is 5 ms.
wdenkc6097192002-11-03 00:24:07 +00002182
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002183 CONFIG_SYS_FPGA_WAIT_CONFIG
wdenkc6097192002-11-03 00:24:07 +00002184
wdenk4a5c8a72003-03-06 00:02:04 +00002185 Time to wait after FPGA configuration. The default is
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02002186 200 ms.
wdenkc6097192002-11-03 00:24:07 +00002187
2188- Configuration Management:
2189 CONFIG_IDENT_STRING
2190
wdenk4a5c8a72003-03-06 00:02:04 +00002191 If defined, this string will be added to the U-Boot
2192 version information (U_BOOT_VERSION)
wdenkc6097192002-11-03 00:24:07 +00002193
2194- Vendor Parameter Protection:
2195
wdenk4a5c8a72003-03-06 00:02:04 +00002196 U-Boot considers the values of the environment
2197 variables "serial#" (Board Serial Number) and
wdenkeb20ad32003-09-05 23:19:14 +00002198 "ethaddr" (Ethernet Address) to be parameters that
wdenk4a5c8a72003-03-06 00:02:04 +00002199 are set once by the board vendor / manufacturer, and
2200 protects these variables from casual modification by
2201 the user. Once set, these variables are read-only,
2202 and write or delete attempts are rejected. You can
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02002203 change this behaviour:
wdenkc6097192002-11-03 00:24:07 +00002204
2205 If CONFIG_ENV_OVERWRITE is #defined in your config
2206 file, the write protection for vendor parameters is
wdenkcc1e2562003-03-06 13:39:27 +00002207 completely disabled. Anybody can change or delete
wdenkc6097192002-11-03 00:24:07 +00002208 these parameters.
2209
2210 Alternatively, if you #define _both_ CONFIG_ETHADDR
2211 _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02002212 Ethernet address is installed in the environment,
wdenkc6097192002-11-03 00:24:07 +00002213 which can be changed exactly ONCE by the user. [The
2214 serial# is unaffected by this, i. e. it remains
2215 read-only.]
2216
Joe Hershberger71497d02012-12-11 22:16:31 -06002217 The same can be accomplished in a more flexible way
2218 for any variable by configuring the type of access
2219 to allow for those variables in the ".flags" variable
2220 or define CONFIG_ENV_FLAGS_LIST_STATIC.
2221
wdenkc6097192002-11-03 00:24:07 +00002222- Protected RAM:
2223 CONFIG_PRAM
2224
2225 Define this variable to enable the reservation of
2226 "protected RAM", i. e. RAM which is not overwritten
2227 by U-Boot. Define CONFIG_PRAM to hold the number of
2228 kB you want to reserve for pRAM. You can overwrite
2229 this default value by defining an environment
2230 variable "pram" to the number of kB you want to
2231 reserve. Note that the board info structure will
2232 still show the full amount of RAM. If pRAM is
2233 reserved, a new environment variable "mem" will
2234 automatically be defined to hold the amount of
2235 remaining RAM in a form that can be passed as boot
2236 argument to Linux, for instance like that:
2237
Wolfgang Denk86eb3b72005-11-20 21:40:11 +01002238 setenv bootargs ... mem=\${mem}
wdenkc6097192002-11-03 00:24:07 +00002239 saveenv
2240
2241 This way you can tell Linux not to use this memory,
2242 either, which results in a memory region that will
2243 not be affected by reboots.
2244
2245 *WARNING* If your board configuration uses automatic
2246 detection of the RAM size, you must make sure that
2247 this memory test is non-destructive. So far, the
2248 following board configurations are known to be
2249 "pRAM-clean":
2250
Wolfgang Denk90326762012-10-24 02:36:15 +00002251 IVMS8, IVML24, SPD8xx, TQM8xxL,
2252 HERMES, IP860, RPXlite, LWMON,
Wolfgang Denkcd4e42e2010-10-05 22:54:53 +02002253 FLAGADM, TQM8260
wdenkc6097192002-11-03 00:24:07 +00002254
Gabe Blacka2f3a932012-12-02 04:55:18 +00002255- Access to physical memory region (> 4GB)
2256 Some basic support is provided for operations on memory not
2257 normally accessible to U-Boot - e.g. some architectures
2258 support access to more than 4GB of memory on 32-bit
2259 machines using physical address extension or similar.
2260 Define CONFIG_PHYSMEM to access this basic support, which
2261 currently only supports clearing the memory.
2262
wdenkc6097192002-11-03 00:24:07 +00002263- Error Recovery:
2264 CONFIG_PANIC_HANG
2265
2266 Define this variable to stop the system in case of a
2267 fatal error, so that you have to reset it manually.
2268 This is probably NOT a good idea for an embedded
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02002269 system where you want the system to reboot
wdenkc6097192002-11-03 00:24:07 +00002270 automatically as fast as possible, but it may be
2271 useful during development since you can try to debug
2272 the conditions that lead to the situation.
2273
2274 CONFIG_NET_RETRY_COUNT
2275
wdenk4a5c8a72003-03-06 00:02:04 +00002276 This variable defines the number of retries for
2277 network operations like ARP, RARP, TFTP, or BOOTP
2278 before giving up the operation. If not defined, a
2279 default value of 5 is used.
wdenkc6097192002-11-03 00:24:07 +00002280
Guennadi Liakhovetskib38c2b32008-04-03 17:04:19 +02002281 CONFIG_ARP_TIMEOUT
2282
2283 Timeout waiting for an ARP reply in milliseconds.
2284
Tetsuyuki Kobayashi147e3902012-07-03 22:25:21 +00002285 CONFIG_NFS_TIMEOUT
2286
2287 Timeout in milliseconds used in NFS protocol.
2288 If you encounter "ERROR: Cannot umount" in nfs command,
2289 try longer timeout such as
2290 #define CONFIG_NFS_TIMEOUT 10000UL
2291
wdenkc6097192002-11-03 00:24:07 +00002292- Command Interpreter:
Wolfgang Denk81352ed2006-10-28 02:28:02 +02002293 CONFIG_AUTO_COMPLETE
wdenk3902d702004-04-15 18:22:41 +00002294
2295 Enable auto completion of commands using TAB.
2296
Wolfgang Denk018147d2006-11-27 15:32:42 +01002297 Note that this feature has NOT been implemented yet
2298 for the "hush" shell.
Wolfgang Denk81352ed2006-10-28 02:28:02 +02002299
2300
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002301 CONFIG_SYS_HUSH_PARSER
wdenkc6097192002-11-03 00:24:07 +00002302
2303 Define this variable to enable the "hush" shell (from
2304 Busybox) as command line interpreter, thus enabling
2305 powerful command line syntax like
2306 if...then...else...fi conditionals or `&&' and '||'
2307 constructs ("shell scripts").
2308
2309 If undefined, you get the old, much simpler behaviour
2310 with a somewhat smaller memory footprint.
2311
2312
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002313 CONFIG_SYS_PROMPT_HUSH_PS2
wdenkc6097192002-11-03 00:24:07 +00002314
2315 This defines the secondary prompt string, which is
2316 printed when the command interpreter needs more input
2317 to complete a command. Usually "> ".
2318
2319 Note:
2320
wdenk57b2d802003-06-27 21:31:46 +00002321 In the current implementation, the local variables
2322 space and global environment variables space are
2323 separated. Local variables are those you define by
2324 simply typing `name=value'. To access a local
2325 variable later on, you have write `$name' or
2326 `${name}'; to execute the contents of a variable
2327 directly type `$name' at the command prompt.
wdenkc6097192002-11-03 00:24:07 +00002328
wdenk4a5c8a72003-03-06 00:02:04 +00002329 Global environment variables are those you use
2330 setenv/printenv to work with. To run a command stored
2331 in such a variable, you need to use the run command,
2332 and you must not use the '$' sign to access them.
wdenkc6097192002-11-03 00:24:07 +00002333
2334 To store commands and special characters in a
2335 variable, please use double quotation marks
2336 surrounding the whole text of the variable, instead
2337 of the backslashes before semicolons and special
2338 symbols.
2339
Wolfgang Denk2039a072006-07-21 11:35:21 +02002340- Commandline Editing and History:
2341 CONFIG_CMDLINE_EDITING
2342
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02002343 Enable editing and History functions for interactive
Wolfgang Denkc80857e2006-07-21 11:56:05 +02002344 commandline input operations
Wolfgang Denk2039a072006-07-21 11:35:21 +02002345
wdenkc0aa5c52003-12-06 19:49:23 +00002346- Default Environment:
wdenkc6097192002-11-03 00:24:07 +00002347 CONFIG_EXTRA_ENV_SETTINGS
2348
wdenk4a5c8a72003-03-06 00:02:04 +00002349 Define this to contain any number of null terminated
2350 strings (variable = value pairs) that will be part of
wdenkeb20ad32003-09-05 23:19:14 +00002351 the default environment compiled into the boot image.
wdenk591dda52002-11-18 00:14:45 +00002352
wdenk4a5c8a72003-03-06 00:02:04 +00002353 For example, place something like this in your
2354 board's config file:
wdenkc6097192002-11-03 00:24:07 +00002355
2356 #define CONFIG_EXTRA_ENV_SETTINGS \
2357 "myvar1=value1\0" \
2358 "myvar2=value2\0"
2359
wdenk4a5c8a72003-03-06 00:02:04 +00002360 Warning: This method is based on knowledge about the
2361 internal format how the environment is stored by the
2362 U-Boot code. This is NOT an official, exported
2363 interface! Although it is unlikely that this format
wdenkeb20ad32003-09-05 23:19:14 +00002364 will change soon, there is no guarantee either.
wdenkc6097192002-11-03 00:24:07 +00002365 You better know what you are doing here.
2366
wdenk4a5c8a72003-03-06 00:02:04 +00002367 Note: overly (ab)use of the default environment is
2368 discouraged. Make sure to check other ways to preset
Wolfgang Denk85c25df2009-04-01 23:34:12 +02002369 the environment like the "source" command or the
wdenk4a5c8a72003-03-06 00:02:04 +00002370 boot command first.
wdenkc6097192002-11-03 00:24:07 +00002371
Stephen Warren1465d5f2012-05-22 09:21:54 +00002372 CONFIG_ENV_VARS_UBOOT_CONFIG
2373
2374 Define this in order to add variables describing the
2375 U-Boot build configuration to the default environment.
2376 These will be named arch, cpu, board, vendor, and soc.
2377
2378 Enabling this option will cause the following to be defined:
2379
2380 - CONFIG_SYS_ARCH
2381 - CONFIG_SYS_CPU
2382 - CONFIG_SYS_BOARD
2383 - CONFIG_SYS_VENDOR
2384 - CONFIG_SYS_SOC
2385
Tom Rini4c8cc9b2012-10-24 07:28:16 +00002386 CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
2387
2388 Define this in order to add variables describing certain
2389 run-time determined information about the hardware to the
2390 environment. These will be named board_name, board_rev.
2391
Simon Glass6b8d5fd2012-11-30 13:01:17 +00002392 CONFIG_DELAY_ENVIRONMENT
2393
2394 Normally the environment is loaded when the board is
2395 intialised so that it is available to U-Boot. This inhibits
2396 that so that the environment is not available until
2397 explicitly loaded later by U-Boot code. With CONFIG_OF_CONTROL
2398 this is instead controlled by the value of
2399 /config/load-environment.
2400
wdenkc0aa5c52003-12-06 19:49:23 +00002401- DataFlash Support:
wdenk381669a2003-06-16 23:50:08 +00002402 CONFIG_HAS_DATAFLASH
2403
wdenk57b2d802003-06-27 21:31:46 +00002404 Defining this option enables DataFlash features and
2405 allows to read/write in Dataflash via the standard
2406 commands cp, md...
wdenk381669a2003-06-16 23:50:08 +00002407
Eric Nelson97f5f8f2012-01-31 10:52:08 -07002408- Serial Flash support
2409 CONFIG_CMD_SF
2410
2411 Defining this option enables SPI flash commands
2412 'sf probe/read/write/erase/update'.
2413
2414 Usage requires an initial 'probe' to define the serial
2415 flash parameters, followed by read/write/erase/update
2416 commands.
2417
2418 The following defaults may be provided by the platform
2419 to handle the common case when only a single serial
2420 flash is present on the system.
2421
2422 CONFIG_SF_DEFAULT_BUS Bus identifier
2423 CONFIG_SF_DEFAULT_CS Chip-select
2424 CONFIG_SF_DEFAULT_MODE (see include/spi.h)
2425 CONFIG_SF_DEFAULT_SPEED in Hz
2426
Simon Glass4b5545e2012-10-08 13:16:02 +00002427 CONFIG_CMD_SF_TEST
2428
2429 Define this option to include a destructive SPI flash
2430 test ('sf test').
2431
wdenkef893942004-02-23 16:11:30 +00002432- SystemACE Support:
2433 CONFIG_SYSTEMACE
2434
2435 Adding this option adds support for Xilinx SystemACE
2436 chips attached via some sort of local bus. The address
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02002437 of the chip must also be defined in the
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002438 CONFIG_SYS_SYSTEMACE_BASE macro. For example:
wdenkef893942004-02-23 16:11:30 +00002439
2440 #define CONFIG_SYSTEMACE
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002441 #define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
wdenkef893942004-02-23 16:11:30 +00002442
2443 When SystemACE support is added, the "ace" device type
2444 becomes available to the fat commands, i.e. fatls.
2445
Wolfgang Denke3cfce52005-09-24 22:37:32 +02002446- TFTP Fixed UDP Port:
2447 CONFIG_TFTP_PORT
2448
Wolfgang Denk227b5192005-09-24 23:25:46 +02002449 If this is defined, the environment variable tftpsrcp
Wolfgang Denke3cfce52005-09-24 22:37:32 +02002450 is used to supply the TFTP UDP source port value.
Wolfgang Denk227b5192005-09-24 23:25:46 +02002451 If tftpsrcp isn't defined, the normal pseudo-random port
Wolfgang Denke3cfce52005-09-24 22:37:32 +02002452 number generator is used.
2453
Wolfgang Denk227b5192005-09-24 23:25:46 +02002454 Also, the environment variable tftpdstp is used to supply
2455 the TFTP UDP destination port value. If tftpdstp isn't
2456 defined, the normal port 69 is used.
2457
2458 The purpose for tftpsrcp is to allow a TFTP server to
Wolfgang Denke3cfce52005-09-24 22:37:32 +02002459 blindly start the TFTP transfer using the pre-configured
2460 target IP address and UDP port. This has the effect of
2461 "punching through" the (Windows XP) firewall, allowing
2462 the remainder of the TFTP transfer to proceed normally.
2463 A better solution is to properly configure the firewall,
2464 but sometimes that is not allowed.
2465
Simon Glass058bb8d2012-12-05 14:46:38 +00002466- Hashing support:
2467 CONFIG_CMD_HASH
2468
2469 This enables a generic 'hash' command which can produce
2470 hashes / digests from a few algorithms (e.g. SHA1, SHA256).
2471
2472 CONFIG_HASH_VERIFY
2473
2474 Enable the hash verify command (hash -v). This adds to code
2475 size a little.
2476
2477 CONFIG_SHA1 - support SHA1 hashing
2478 CONFIG_SHA256 - support SHA256 hashing
2479
2480 Note: There is also a sha1sum command, which should perhaps
2481 be deprecated in favour of 'hash sha1'.
2482
wdenkc0aa5c52003-12-06 19:49:23 +00002483- Show boot progress:
wdenkc6097192002-11-03 00:24:07 +00002484 CONFIG_SHOW_BOOT_PROGRESS
2485
wdenk4a5c8a72003-03-06 00:02:04 +00002486 Defining this option allows to add some board-
2487 specific code (calling a user-provided function
2488 "show_boot_progress(int)") that enables you to show
2489 the system's boot progress on some display (for
2490 example, some LED's) on your board. At the moment,
2491 the following checkpoints are implemented:
wdenkc6097192002-11-03 00:24:07 +00002492
Simon Glass31a870e2012-02-13 13:51:19 +00002493- Detailed boot stage timing
2494 CONFIG_BOOTSTAGE
2495 Define this option to get detailed timing of each stage
2496 of the boot process.
2497
2498 CONFIG_BOOTSTAGE_USER_COUNT
2499 This is the number of available user bootstage records.
2500 Each time you call bootstage_mark(BOOTSTAGE_ID_ALLOC, ...)
2501 a new ID will be allocated from this stash. If you exceed
2502 the limit, recording will stop.
2503
2504 CONFIG_BOOTSTAGE_REPORT
2505 Define this to print a report before boot, similar to this:
2506
2507 Timer summary in microseconds:
2508 Mark Elapsed Stage
2509 0 0 reset
2510 3,575,678 3,575,678 board_init_f start
2511 3,575,695 17 arch_cpu_init A9
2512 3,575,777 82 arch_cpu_init done
2513 3,659,598 83,821 board_init_r start
2514 3,910,375 250,777 main_loop
2515 29,916,167 26,005,792 bootm_start
2516 30,361,327 445,160 start_kernel
2517
Simon Glass4afd88e2012-09-28 08:56:39 +00002518 CONFIG_CMD_BOOTSTAGE
2519 Add a 'bootstage' command which supports printing a report
2520 and un/stashing of bootstage data.
2521
Simon Glass0fa36a42012-09-28 08:56:37 +00002522 CONFIG_BOOTSTAGE_FDT
2523 Stash the bootstage information in the FDT. A root 'bootstage'
2524 node is created with each bootstage id as a child. Each child
2525 has a 'name' property and either 'mark' containing the
2526 mark time in microsecond, or 'accum' containing the
2527 accumulated time for that bootstage id in microseconds.
2528 For example:
2529
2530 bootstage {
2531 154 {
2532 name = "board_init_f";
2533 mark = <3575678>;
2534 };
2535 170 {
2536 name = "lcd";
2537 accum = <33482>;
2538 };
2539 };
2540
2541 Code in the Linux kernel can find this in /proc/devicetree.
2542
Marian Balakowicz74eb4ae2008-03-12 10:33:01 +01002543Legacy uImage format:
2544
wdenkc6097192002-11-03 00:24:07 +00002545 Arg Where When
2546 1 common/cmd_bootm.c before attempting to boot an image
wdenk544e9732004-02-06 23:19:44 +00002547 -1 common/cmd_bootm.c Image header has bad magic number
wdenkc6097192002-11-03 00:24:07 +00002548 2 common/cmd_bootm.c Image header has correct magic number
wdenk544e9732004-02-06 23:19:44 +00002549 -2 common/cmd_bootm.c Image header has bad checksum
wdenkc6097192002-11-03 00:24:07 +00002550 3 common/cmd_bootm.c Image header has correct checksum
wdenk544e9732004-02-06 23:19:44 +00002551 -3 common/cmd_bootm.c Image data has bad checksum
wdenkc6097192002-11-03 00:24:07 +00002552 4 common/cmd_bootm.c Image data has correct checksum
2553 -4 common/cmd_bootm.c Image is for unsupported architecture
2554 5 common/cmd_bootm.c Architecture check OK
Marian Balakowicz74eb4ae2008-03-12 10:33:01 +01002555 -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi)
wdenkc6097192002-11-03 00:24:07 +00002556 6 common/cmd_bootm.c Image Type check OK
2557 -6 common/cmd_bootm.c gunzip uncompression error
2558 -7 common/cmd_bootm.c Unimplemented compression type
2559 7 common/cmd_bootm.c Uncompression OK
Marian Balakowicz74eb4ae2008-03-12 10:33:01 +01002560 8 common/cmd_bootm.c No uncompress/copy overwrite error
wdenkc6097192002-11-03 00:24:07 +00002561 -9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX)
Marian Balakowicz74eb4ae2008-03-12 10:33:01 +01002562
2563 9 common/image.c Start initial ramdisk verification
2564 -10 common/image.c Ramdisk header has bad magic number
2565 -11 common/image.c Ramdisk header has bad checksum
2566 10 common/image.c Ramdisk header is OK
2567 -12 common/image.c Ramdisk data has bad checksum
2568 11 common/image.c Ramdisk data has correct checksum
2569 12 common/image.c Ramdisk verification complete, start loading
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02002570 -13 common/image.c Wrong Image Type (not PPC Linux ramdisk)
Marian Balakowicz74eb4ae2008-03-12 10:33:01 +01002571 13 common/image.c Start multifile image verification
2572 14 common/image.c No initial ramdisk, no multifile, continue.
2573
Wolfgang Denk092ae952011-10-26 10:21:21 +00002574 15 arch/<arch>/lib/bootm.c All preparation done, transferring control to OS
wdenkc6097192002-11-03 00:24:07 +00002575
Stefan Roese88fbf932010-04-15 16:07:28 +02002576 -30 arch/powerpc/lib/board.c Fatal error, hang the system
wdenkd729d302004-02-27 00:07:27 +00002577 -31 post/post.c POST test failed, detected by post_output_backlog()
2578 -32 post/post.c POST test failed, detected by post_run_single()
wdenke97d3d92004-02-23 22:22:28 +00002579
Heiko Schocher633e03a2007-06-22 19:11:54 +02002580 34 common/cmd_doc.c before loading a Image from a DOC device
2581 -35 common/cmd_doc.c Bad usage of "doc" command
2582 35 common/cmd_doc.c correct usage of "doc" command
2583 -36 common/cmd_doc.c No boot device
2584 36 common/cmd_doc.c correct boot device
2585 -37 common/cmd_doc.c Unknown Chip ID on boot device
2586 37 common/cmd_doc.c correct chip ID found, device available
2587 -38 common/cmd_doc.c Read Error on boot device
2588 38 common/cmd_doc.c reading Image header from DOC device OK
2589 -39 common/cmd_doc.c Image header has bad magic number
2590 39 common/cmd_doc.c Image header has correct magic number
2591 -40 common/cmd_doc.c Error reading Image from DOC device
2592 40 common/cmd_doc.c Image header has correct magic number
2593 41 common/cmd_ide.c before loading a Image from a IDE device
2594 -42 common/cmd_ide.c Bad usage of "ide" command
2595 42 common/cmd_ide.c correct usage of "ide" command
2596 -43 common/cmd_ide.c No boot device
2597 43 common/cmd_ide.c boot device found
2598 -44 common/cmd_ide.c Device not available
2599 44 common/cmd_ide.c Device available
2600 -45 common/cmd_ide.c wrong partition selected
2601 45 common/cmd_ide.c partition selected
2602 -46 common/cmd_ide.c Unknown partition table
2603 46 common/cmd_ide.c valid partition table found
2604 -47 common/cmd_ide.c Invalid partition type
2605 47 common/cmd_ide.c correct partition type
2606 -48 common/cmd_ide.c Error reading Image Header on boot device
2607 48 common/cmd_ide.c reading Image Header from IDE device OK
2608 -49 common/cmd_ide.c Image header has bad magic number
2609 49 common/cmd_ide.c Image header has correct magic number
2610 -50 common/cmd_ide.c Image header has bad checksum
2611 50 common/cmd_ide.c Image header has correct checksum
2612 -51 common/cmd_ide.c Error reading Image from IDE device
2613 51 common/cmd_ide.c reading Image from IDE device OK
2614 52 common/cmd_nand.c before loading a Image from a NAND device
2615 -53 common/cmd_nand.c Bad usage of "nand" command
2616 53 common/cmd_nand.c correct usage of "nand" command
2617 -54 common/cmd_nand.c No boot device
2618 54 common/cmd_nand.c boot device found
2619 -55 common/cmd_nand.c Unknown Chip ID on boot device
2620 55 common/cmd_nand.c correct chip ID found, device available
2621 -56 common/cmd_nand.c Error reading Image Header on boot device
2622 56 common/cmd_nand.c reading Image Header from NAND device OK
2623 -57 common/cmd_nand.c Image header has bad magic number
2624 57 common/cmd_nand.c Image header has correct magic number
2625 -58 common/cmd_nand.c Error reading Image from NAND device
2626 58 common/cmd_nand.c reading Image from NAND device OK
wdenkc6097192002-11-03 00:24:07 +00002627
Heiko Schocher633e03a2007-06-22 19:11:54 +02002628 -60 common/env_common.c Environment has a bad CRC, using default
wdenkc6097192002-11-03 00:24:07 +00002629
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02002630 64 net/eth.c starting with Ethernet configuration.
Heiko Schocher633e03a2007-06-22 19:11:54 +02002631 -64 net/eth.c no Ethernet found.
2632 65 net/eth.c Ethernet found.
wdenkc6097192002-11-03 00:24:07 +00002633
Heiko Schocher633e03a2007-06-22 19:11:54 +02002634 -80 common/cmd_net.c usage wrong
2635 80 common/cmd_net.c before calling NetLoop()
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02002636 -81 common/cmd_net.c some error in NetLoop() occurred
Heiko Schocher633e03a2007-06-22 19:11:54 +02002637 81 common/cmd_net.c NetLoop() back without error
2638 -82 common/cmd_net.c size == 0 (File with size 0 loaded)
2639 82 common/cmd_net.c trying automatic boot
Wolfgang Denk85c25df2009-04-01 23:34:12 +02002640 83 common/cmd_net.c running "source" command
2641 -83 common/cmd_net.c some error in automatic boot or "source" command
Heiko Schocher633e03a2007-06-22 19:11:54 +02002642 84 common/cmd_net.c end without errors
wdenkc6097192002-11-03 00:24:07 +00002643
Marian Balakowicz74eb4ae2008-03-12 10:33:01 +01002644FIT uImage format:
2645
2646 Arg Where When
2647 100 common/cmd_bootm.c Kernel FIT Image has correct format
2648 -100 common/cmd_bootm.c Kernel FIT Image has incorrect format
2649 101 common/cmd_bootm.c No Kernel subimage unit name, using configuration
2650 -101 common/cmd_bootm.c Can't get configuration for kernel subimage
2651 102 common/cmd_bootm.c Kernel unit name specified
2652 -103 common/cmd_bootm.c Can't get kernel subimage node offset
Marian Balakowicz0cd4f3d2008-03-12 10:35:46 +01002653 103 common/cmd_bootm.c Found configuration node
Marian Balakowicz74eb4ae2008-03-12 10:33:01 +01002654 104 common/cmd_bootm.c Got kernel subimage node offset
2655 -104 common/cmd_bootm.c Kernel subimage hash verification failed
2656 105 common/cmd_bootm.c Kernel subimage hash verification OK
2657 -105 common/cmd_bootm.c Kernel subimage is for unsupported architecture
2658 106 common/cmd_bootm.c Architecture check OK
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02002659 -106 common/cmd_bootm.c Kernel subimage has wrong type
2660 107 common/cmd_bootm.c Kernel subimage type OK
Marian Balakowicz74eb4ae2008-03-12 10:33:01 +01002661 -107 common/cmd_bootm.c Can't get kernel subimage data/size
2662 108 common/cmd_bootm.c Got kernel subimage data/size
2663 -108 common/cmd_bootm.c Wrong image type (not legacy, FIT)
2664 -109 common/cmd_bootm.c Can't get kernel subimage type
2665 -110 common/cmd_bootm.c Can't get kernel subimage comp
2666 -111 common/cmd_bootm.c Can't get kernel subimage os
2667 -112 common/cmd_bootm.c Can't get kernel subimage load address
2668 -113 common/cmd_bootm.c Image uncompress/copy overwrite error
2669
2670 120 common/image.c Start initial ramdisk verification
2671 -120 common/image.c Ramdisk FIT image has incorrect format
2672 121 common/image.c Ramdisk FIT image has correct format
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02002673 122 common/image.c No ramdisk subimage unit name, using configuration
Marian Balakowicz74eb4ae2008-03-12 10:33:01 +01002674 -122 common/image.c Can't get configuration for ramdisk subimage
2675 123 common/image.c Ramdisk unit name specified
2676 -124 common/image.c Can't get ramdisk subimage node offset
2677 125 common/image.c Got ramdisk subimage node offset
2678 -125 common/image.c Ramdisk subimage hash verification failed
2679 126 common/image.c Ramdisk subimage hash verification OK
2680 -126 common/image.c Ramdisk subimage for unsupported architecture
2681 127 common/image.c Architecture check OK
2682 -127 common/image.c Can't get ramdisk subimage data/size
2683 128 common/image.c Got ramdisk subimage data/size
2684 129 common/image.c Can't get ramdisk load address
2685 -129 common/image.c Got ramdisk load address
2686
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02002687 -130 common/cmd_doc.c Incorrect FIT image format
Marian Balakowicz74eb4ae2008-03-12 10:33:01 +01002688 131 common/cmd_doc.c FIT image format OK
2689
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02002690 -140 common/cmd_ide.c Incorrect FIT image format
Marian Balakowicz74eb4ae2008-03-12 10:33:01 +01002691 141 common/cmd_ide.c FIT image format OK
2692
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02002693 -150 common/cmd_nand.c Incorrect FIT image format
Marian Balakowicz74eb4ae2008-03-12 10:33:01 +01002694 151 common/cmd_nand.c FIT image format OK
2695
Gabe Blackd572e162012-10-25 16:31:10 +00002696- FIT image support:
2697 CONFIG_FIT
2698 Enable support for the FIT uImage format.
2699
2700 CONFIG_FIT_BEST_MATCH
2701 When no configuration is explicitly selected, default to the
2702 one whose fdt's compatibility field best matches that of
2703 U-Boot itself. A match is considered "best" if it matches the
2704 most specific compatibility entry of U-Boot's fdt's root node.
2705 The order of entries in the configuration's fdt is ignored.
2706
Wolfgang Denkd590fb12011-10-07 09:58:21 +02002707- Standalone program support:
2708 CONFIG_STANDALONE_LOAD_ADDR
2709
Wolfgang Denk23f78482011-10-09 21:06:34 +02002710 This option defines a board specific value for the
2711 address where standalone program gets loaded, thus
2712 overwriting the architecture dependent default
Wolfgang Denkd590fb12011-10-07 09:58:21 +02002713 settings.
2714
2715- Frame Buffer Address:
2716 CONFIG_FB_ADDR
2717
2718 Define CONFIG_FB_ADDR if you want to use specific
Wolfgang Denka71eb8e2013-01-03 00:43:59 +00002719 address for frame buffer. This is typically the case
2720 when using a graphics controller has separate video
2721 memory. U-Boot will then place the frame buffer at
2722 the given address instead of dynamically reserving it
2723 in system RAM by calling lcd_setmem(), which grabs
2724 the memory for the frame buffer depending on the
2725 configured panel size.
Wolfgang Denkd590fb12011-10-07 09:58:21 +02002726
2727 Please see board_init_f function.
2728
Detlev Zundel0ecb6112009-12-01 17:16:19 +01002729- Automatic software updates via TFTP server
2730 CONFIG_UPDATE_TFTP
2731 CONFIG_UPDATE_TFTP_CNT_MAX
2732 CONFIG_UPDATE_TFTP_MSEC_MAX
2733
2734 These options enable and control the auto-update feature;
2735 for a more detailed description refer to doc/README.update.
2736
2737- MTD Support (mtdparts command, UBI support)
2738 CONFIG_MTD_DEVICE
2739
2740 Adds the MTD device infrastructure from the Linux kernel.
2741 Needed for mtdparts command support.
2742
2743 CONFIG_MTD_PARTITIONS
2744
2745 Adds the MTD partitioning infrastructure from the Linux
2746 kernel. Needed for UBI support.
2747
Daniel Schwierzeck39ca08e2011-07-18 07:48:07 +00002748- SPL framework
Wolfgang Denk825223d2011-09-11 21:24:09 +02002749 CONFIG_SPL
2750 Enable building of SPL globally.
Daniel Schwierzeck39ca08e2011-07-18 07:48:07 +00002751
Tom Rini36853852012-02-14 07:29:40 +00002752 CONFIG_SPL_LDSCRIPT
2753 LDSCRIPT for linking the SPL binary.
2754
2755 CONFIG_SPL_MAX_SIZE
2756 Maximum binary size (text, data and rodata) of the SPL binary.
2757
Wolfgang Denk825223d2011-09-11 21:24:09 +02002758 CONFIG_SPL_TEXT_BASE
2759 TEXT_BASE for linking the SPL binary.
Daniel Schwierzeck39ca08e2011-07-18 07:48:07 +00002760
Scott Woodc4f0d002012-09-20 19:05:12 -05002761 CONFIG_SPL_RELOC_TEXT_BASE
2762 Address to relocate to. If unspecified, this is equal to
2763 CONFIG_SPL_TEXT_BASE (i.e. no relocation is done).
2764
Tom Rini36853852012-02-14 07:29:40 +00002765 CONFIG_SPL_BSS_START_ADDR
2766 Link address for the BSS within the SPL binary.
2767
2768 CONFIG_SPL_BSS_MAX_SIZE
2769 Maximum binary size of the BSS section of the SPL binary.
2770
2771 CONFIG_SPL_STACK
2772 Adress of the start of the stack SPL will use
2773
Scott Woodc4f0d002012-09-20 19:05:12 -05002774 CONFIG_SPL_RELOC_STACK
2775 Adress of the start of the stack SPL will use after
2776 relocation. If unspecified, this is equal to
2777 CONFIG_SPL_STACK.
2778
Tom Rini36853852012-02-14 07:29:40 +00002779 CONFIG_SYS_SPL_MALLOC_START
2780 Starting address of the malloc pool used in SPL.
2781
2782 CONFIG_SYS_SPL_MALLOC_SIZE
2783 The size of the malloc pool used in SPL.
Daniel Schwierzeck39ca08e2011-07-18 07:48:07 +00002784
Tom Rini28591df2012-08-13 12:03:19 -07002785 CONFIG_SPL_FRAMEWORK
2786 Enable the SPL framework under common/. This framework
2787 supports MMC, NAND and YMODEM loading of U-Boot and NAND
2788 NAND loading of the Linux Kernel.
2789
Tom Rinife3b0c72012-08-13 11:37:56 -07002790 CONFIG_SPL_DISPLAY_PRINT
2791 For ARM, enable an optional function to print more information
2792 about the running system.
2793
Scott Wood7c810902012-09-20 16:35:21 -05002794 CONFIG_SPL_INIT_MINIMAL
2795 Arch init code should be built for a very small image
2796
Wolfgang Denk825223d2011-09-11 21:24:09 +02002797 CONFIG_SPL_LIBCOMMON_SUPPORT
2798 Support for common/libcommon.o in SPL binary
Daniel Schwierzeck39ca08e2011-07-18 07:48:07 +00002799
Wolfgang Denk825223d2011-09-11 21:24:09 +02002800 CONFIG_SPL_LIBDISK_SUPPORT
2801 Support for disk/libdisk.o in SPL binary
Daniel Schwierzeck39ca08e2011-07-18 07:48:07 +00002802
Wolfgang Denk825223d2011-09-11 21:24:09 +02002803 CONFIG_SPL_I2C_SUPPORT
2804 Support for drivers/i2c/libi2c.o in SPL binary
Daniel Schwierzeck39ca08e2011-07-18 07:48:07 +00002805
Wolfgang Denk825223d2011-09-11 21:24:09 +02002806 CONFIG_SPL_GPIO_SUPPORT
2807 Support for drivers/gpio/libgpio.o in SPL binary
Daniel Schwierzeck39ca08e2011-07-18 07:48:07 +00002808
Wolfgang Denk825223d2011-09-11 21:24:09 +02002809 CONFIG_SPL_MMC_SUPPORT
2810 Support for drivers/mmc/libmmc.o in SPL binary
Daniel Schwierzeck39ca08e2011-07-18 07:48:07 +00002811
Tom Rini36853852012-02-14 07:29:40 +00002812 CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR,
2813 CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS,
2814 CONFIG_SYS_MMC_SD_FAT_BOOT_PARTITION
2815 Address, size and partition on the MMC to load U-Boot from
2816 when the MMC is being used in raw mode.
2817
2818 CONFIG_SPL_FAT_SUPPORT
2819 Support for fs/fat/libfat.o in SPL binary
2820
2821 CONFIG_SPL_FAT_LOAD_PAYLOAD_NAME
2822 Filename to read to load U-Boot when reading from FAT
2823
Scott Wood2b36fbb2012-12-06 13:33:17 +00002824 CONFIG_SPL_MPC83XX_WAIT_FOR_NAND
2825 Set this for NAND SPL on PPC mpc83xx targets, so that
2826 start.S waits for the rest of the SPL to load before
2827 continuing (the hardware starts execution after just
2828 loading the first page rather than the full 4K).
2829
Scott Woodc352a0c2012-09-20 19:09:07 -05002830 CONFIG_SPL_NAND_BASE
2831 Include nand_base.c in the SPL. Requires
2832 CONFIG_SPL_NAND_DRIVERS.
2833
2834 CONFIG_SPL_NAND_DRIVERS
2835 SPL uses normal NAND drivers, not minimal drivers.
2836
2837 CONFIG_SPL_NAND_ECC
2838 Include standard software ECC in the SPL
2839
Tom Rini36853852012-02-14 07:29:40 +00002840 CONFIG_SPL_NAND_SIMPLE
Scott Wood36c440e2012-09-21 18:35:27 -05002841 Support for NAND boot using simple NAND drivers that
2842 expose the cmd_ctrl() interface.
Tom Rini36853852012-02-14 07:29:40 +00002843
2844 CONFIG_SYS_NAND_5_ADDR_CYCLE, CONFIG_SYS_NAND_PAGE_COUNT,
2845 CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE,
2846 CONFIG_SYS_NAND_BLOCK_SIZE, CONFIG_SYS_NAND_BAD_BLOCK_POS,
2847 CONFIG_SYS_NAND_ECCPOS, CONFIG_SYS_NAND_ECCSIZE,
2848 CONFIG_SYS_NAND_ECCBYTES
2849 Defines the size and behavior of the NAND that SPL uses
Scott Wood36c440e2012-09-21 18:35:27 -05002850 to read U-Boot
Tom Rini36853852012-02-14 07:29:40 +00002851
2852 CONFIG_SYS_NAND_U_BOOT_OFFS
Scott Wood36c440e2012-09-21 18:35:27 -05002853 Location in NAND to read U-Boot from
2854
2855 CONFIG_SYS_NAND_U_BOOT_DST
2856 Location in memory to load U-Boot to
2857
2858 CONFIG_SYS_NAND_U_BOOT_SIZE
2859 Size of image to load
Tom Rini36853852012-02-14 07:29:40 +00002860
2861 CONFIG_SYS_NAND_U_BOOT_START
Scott Wood36c440e2012-09-21 18:35:27 -05002862 Entry point in loaded image to jump to
Tom Rini36853852012-02-14 07:29:40 +00002863
2864 CONFIG_SYS_NAND_HW_ECC_OOBFIRST
2865 Define this if you need to first read the OOB and then the
2866 data. This is used for example on davinci plattforms.
2867
2868 CONFIG_SPL_OMAP3_ID_NAND
2869 Support for an OMAP3-specific set of functions to return the
2870 ID and MFR of the first attached NAND chip, if present.
2871
Wolfgang Denk825223d2011-09-11 21:24:09 +02002872 CONFIG_SPL_SERIAL_SUPPORT
2873 Support for drivers/serial/libserial.o in SPL binary
Daniel Schwierzeck39ca08e2011-07-18 07:48:07 +00002874
Wolfgang Denk825223d2011-09-11 21:24:09 +02002875 CONFIG_SPL_SPI_FLASH_SUPPORT
2876 Support for drivers/mtd/spi/libspi_flash.o in SPL binary
Daniel Schwierzeck39ca08e2011-07-18 07:48:07 +00002877
Wolfgang Denk825223d2011-09-11 21:24:09 +02002878 CONFIG_SPL_SPI_SUPPORT
2879 Support for drivers/spi/libspi.o in SPL binary
Daniel Schwierzeck39ca08e2011-07-18 07:48:07 +00002880
Pavel Machekde997252012-08-30 22:42:11 +02002881 CONFIG_SPL_RAM_DEVICE
2882 Support for running image already present in ram, in SPL binary
2883
Wolfgang Denk825223d2011-09-11 21:24:09 +02002884 CONFIG_SPL_LIBGENERIC_SUPPORT
2885 Support for lib/libgeneric.o in SPL binary
Marian Balakowicz74eb4ae2008-03-12 10:33:01 +01002886
Scott Woodeb7bd972012-12-06 13:33:16 +00002887 CONFIG_SPL_PAD_TO
2888 Linker address to which the SPL should be padded before
2889 appending the SPL payload.
2890
Scott Woodf147eb72012-09-21 16:27:32 -05002891 CONFIG_SPL_TARGET
2892 Final target image containing SPL and payload. Some SPLs
2893 use an arch-specific makefile fragment instead, for
2894 example if more than one image needs to be produced.
2895
wdenkc6097192002-11-03 00:24:07 +00002896Modem Support:
2897--------------
2898
Wolfgang Denk8f399b32011-05-01 20:44:23 +02002899[so far only for SMDK2400 boards]
wdenkc6097192002-11-03 00:24:07 +00002900
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02002901- Modem support enable:
wdenkc6097192002-11-03 00:24:07 +00002902 CONFIG_MODEM_SUPPORT
2903
2904- RTS/CTS Flow control enable:
2905 CONFIG_HWFLOW
2906
2907- Modem debug support:
2908 CONFIG_MODEM_SUPPORT_DEBUG
2909
wdenk4a5c8a72003-03-06 00:02:04 +00002910 Enables debugging stuff (char screen[1024], dbg())
2911 for modem support. Useful only with BDI2000.
wdenkc6097192002-11-03 00:24:07 +00002912
wdenkc0aa5c52003-12-06 19:49:23 +00002913- Interrupt support (PPC):
2914
wdenk1ebf41e2004-01-02 14:00:00 +00002915 There are common interrupt_init() and timer_interrupt()
2916 for all PPC archs. interrupt_init() calls interrupt_init_cpu()
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02002917 for CPU specific initialization. interrupt_init_cpu()
wdenk1ebf41e2004-01-02 14:00:00 +00002918 should set decrementer_count to appropriate value. If
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02002919 CPU resets decrementer automatically after interrupt
wdenk1ebf41e2004-01-02 14:00:00 +00002920 (ppc4xx) it should set decrementer_count to zero.
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02002921 timer_interrupt() calls timer_interrupt_cpu() for CPU
wdenk1ebf41e2004-01-02 14:00:00 +00002922 specific handling. If board has watchdog / status_led
2923 / other_activity_monitor it works automatically from
2924 general timer_interrupt().
wdenkc0aa5c52003-12-06 19:49:23 +00002925
wdenkc6097192002-11-03 00:24:07 +00002926- General:
2927
wdenk4a5c8a72003-03-06 00:02:04 +00002928 In the target system modem support is enabled when a
2929 specific key (key combination) is pressed during
2930 power-on. Otherwise U-Boot will boot normally
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02002931 (autoboot). The key_pressed() function is called from
wdenk4a5c8a72003-03-06 00:02:04 +00002932 board_init(). Currently key_pressed() is a dummy
2933 function, returning 1 and thus enabling modem
2934 initialization.
wdenkc6097192002-11-03 00:24:07 +00002935
wdenk4a5c8a72003-03-06 00:02:04 +00002936 If there are no modem init strings in the
2937 environment, U-Boot proceed to autoboot; the
2938 previous output (banner, info printfs) will be
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02002939 suppressed, though.
wdenkc6097192002-11-03 00:24:07 +00002940
2941 See also: doc/README.Modem
2942
Helmut Raigerd5a184b2011-10-20 04:19:47 +00002943Board initialization settings:
2944------------------------------
2945
2946During Initialization u-boot calls a number of board specific functions
2947to allow the preparation of board specific prerequisites, e.g. pin setup
2948before drivers are initialized. To enable these callbacks the
2949following configuration macros have to be defined. Currently this is
2950architecture specific, so please check arch/your_architecture/lib/board.c
2951typically in board_init_f() and board_init_r().
2952
2953- CONFIG_BOARD_EARLY_INIT_F: Call board_early_init_f()
2954- CONFIG_BOARD_EARLY_INIT_R: Call board_early_init_r()
2955- CONFIG_BOARD_LATE_INIT: Call board_late_init()
2956- CONFIG_BOARD_POSTCLK_INIT: Call board_postclk_init()
wdenkc6097192002-11-03 00:24:07 +00002957
wdenkc6097192002-11-03 00:24:07 +00002958Configuration Settings:
2959-----------------------
2960
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002961- CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
wdenkc6097192002-11-03 00:24:07 +00002962 undefine this when you're short of memory.
2963
Peter Tyserdfb72b82009-01-27 18:03:12 -06002964- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
2965 width of the commands listed in the 'help' command output.
2966
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002967- CONFIG_SYS_PROMPT: This is what U-Boot prints on the console to
wdenkc6097192002-11-03 00:24:07 +00002968 prompt for user input.
2969
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002970- CONFIG_SYS_CBSIZE: Buffer size for input from the Console
wdenkc6097192002-11-03 00:24:07 +00002971
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002972- CONFIG_SYS_PBSIZE: Buffer size for Console output
wdenkc6097192002-11-03 00:24:07 +00002973
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002974- CONFIG_SYS_MAXARGS: max. Number of arguments accepted for monitor commands
wdenkc6097192002-11-03 00:24:07 +00002975
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002976- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
wdenkc6097192002-11-03 00:24:07 +00002977 the application (usually a Linux kernel) when it is
2978 booted
2979
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002980- CONFIG_SYS_BAUDRATE_TABLE:
wdenkc6097192002-11-03 00:24:07 +00002981 List of legal baudrate settings for this board.
2982
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002983- CONFIG_SYS_CONSOLE_INFO_QUIET
wdenk57b2d802003-06-27 21:31:46 +00002984 Suppress display of console information at boot.
wdenkc6097192002-11-03 00:24:07 +00002985
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002986- CONFIG_SYS_CONSOLE_IS_IN_ENV
wdenk57b2d802003-06-27 21:31:46 +00002987 If the board specific function
2988 extern int overwrite_console (void);
2989 returns 1, the stdin, stderr and stdout are switched to the
wdenkc6097192002-11-03 00:24:07 +00002990 serial port, else the settings in the environment are used.
2991
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002992- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
wdenk57b2d802003-06-27 21:31:46 +00002993 Enable the call to overwrite_console().
wdenkc6097192002-11-03 00:24:07 +00002994
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002995- CONFIG_SYS_CONSOLE_ENV_OVERWRITE
wdenkc6097192002-11-03 00:24:07 +00002996 Enable overwrite of previous console environment settings.
2997
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02002998- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
wdenkc6097192002-11-03 00:24:07 +00002999 Begin and End addresses of the area used by the
3000 simple memory test.
3001
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003002- CONFIG_SYS_ALT_MEMTEST:
wdenk57b2d802003-06-27 21:31:46 +00003003 Enable an alternate, more extensive memory test.
wdenkc6097192002-11-03 00:24:07 +00003004
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003005- CONFIG_SYS_MEMTEST_SCRATCH:
wdenk5958f4a2003-09-18 09:21:33 +00003006 Scratch address used by the alternate memory test
3007 You only need to set this if address zero isn't writeable
3008
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003009- CONFIG_SYS_MEM_TOP_HIDE (PPC only):
3010 If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
Stefan Roesea13709f2008-03-26 10:14:11 +01003011 this specified memory area will get subtracted from the top
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02003012 (end) of RAM and won't get "touched" at all by U-Boot. By
Stefan Roesea13709f2008-03-26 10:14:11 +01003013 fixing up gd->ram_size the Linux kernel should gets passed
3014 the now "corrected" memory size and won't touch it either.
3015 This should work for arch/ppc and arch/powerpc. Only Linux
Stefan Roese37f31bf2008-03-28 11:02:53 +01003016 board ports in arch/powerpc with bootwrapper support that
Stefan Roesea13709f2008-03-26 10:14:11 +01003017 recalculate the memory size from the SDRAM controller setup
Stefan Roese37f31bf2008-03-28 11:02:53 +01003018 will have to get fixed in Linux additionally.
Stefan Roesea13709f2008-03-26 10:14:11 +01003019
3020 This option can be used as a workaround for the 440EPx/GRx
3021 CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
3022 be touched.
3023
3024 WARNING: Please make sure that this value is a multiple of
3025 the Linux page size (normally 4k). If this is not the case,
3026 then the end address of the Linux memory will be located at a
3027 non page size aligned address and this could cause major
3028 problems.
3029
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003030- CONFIG_SYS_LOADS_BAUD_CHANGE:
wdenkc6097192002-11-03 00:24:07 +00003031 Enable temporary baudrate change while serial download
3032
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003033- CONFIG_SYS_SDRAM_BASE:
wdenkc6097192002-11-03 00:24:07 +00003034 Physical start address of SDRAM. _Must_ be 0 here.
3035
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003036- CONFIG_SYS_MBIO_BASE:
wdenkc6097192002-11-03 00:24:07 +00003037 Physical start address of Motherboard I/O (if using a
3038 Cogent motherboard)
3039
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003040- CONFIG_SYS_FLASH_BASE:
wdenkc6097192002-11-03 00:24:07 +00003041 Physical start address of Flash memory.
3042
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003043- CONFIG_SYS_MONITOR_BASE:
wdenkc6097192002-11-03 00:24:07 +00003044 Physical start address of boot monitor code (set by
3045 make config files to be same as the text base address
Wolfgang Denk0708bc62010-10-07 21:51:12 +02003046 (CONFIG_SYS_TEXT_BASE) used when linking) - same as
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003047 CONFIG_SYS_FLASH_BASE when booting from flash.
wdenkc6097192002-11-03 00:24:07 +00003048
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003049- CONFIG_SYS_MONITOR_LEN:
wdenk57b2d802003-06-27 21:31:46 +00003050 Size of memory reserved for monitor code, used to
3051 determine _at_compile_time_ (!) if the environment is
3052 embedded within the U-Boot image, or in a separate
3053 flash sector.
wdenkc6097192002-11-03 00:24:07 +00003054
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003055- CONFIG_SYS_MALLOC_LEN:
wdenkc6097192002-11-03 00:24:07 +00003056 Size of DRAM reserved for malloc() use.
3057
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003058- CONFIG_SYS_BOOTM_LEN:
Stefan Roese5d5ce292006-03-13 11:16:36 +01003059 Normally compressed uImages are limited to an
3060 uncompressed size of 8 MBytes. If this is not enough,
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003061 you can define CONFIG_SYS_BOOTM_LEN in your board config file
Stefan Roese5d5ce292006-03-13 11:16:36 +01003062 to adjust this setting to your needs.
3063
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003064- CONFIG_SYS_BOOTMAPSZ:
wdenkc6097192002-11-03 00:24:07 +00003065 Maximum size of memory mapped by the startup code of
3066 the Linux kernel; all data that must be processed by
Bartlomiej Siekac5648c82008-04-14 15:44:16 +02003067 the Linux kernel (bd_info, boot arguments, FDT blob if
3068 used) must be put below this limit, unless "bootm_low"
3069 enviroment variable is defined and non-zero. In such case
3070 all data for the Linux kernel must be between "bootm_low"
Wolfgang Denk092ae952011-10-26 10:21:21 +00003071 and "bootm_low" + CONFIG_SYS_BOOTMAPSZ. The environment
Grant Likely26396382011-03-28 09:58:43 +00003072 variable "bootm_mapsize" will override the value of
3073 CONFIG_SYS_BOOTMAPSZ. If CONFIG_SYS_BOOTMAPSZ is undefined,
3074 then the value in "bootm_size" will be used instead.
wdenkc6097192002-11-03 00:24:07 +00003075
John Rigbyeea8e692010-10-13 13:57:35 -06003076- CONFIG_SYS_BOOT_RAMDISK_HIGH:
3077 Enable initrd_high functionality. If defined then the
3078 initrd_high feature is enabled and the bootm ramdisk subcommand
3079 is enabled.
3080
3081- CONFIG_SYS_BOOT_GET_CMDLINE:
3082 Enables allocating and saving kernel cmdline in space between
3083 "bootm_low" and "bootm_low" + BOOTMAPSZ.
3084
3085- CONFIG_SYS_BOOT_GET_KBD:
3086 Enables allocating and saving a kernel copy of the bd_info in
3087 space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
3088
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003089- CONFIG_SYS_MAX_FLASH_BANKS:
wdenkc6097192002-11-03 00:24:07 +00003090 Max number of Flash memory banks
3091
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003092- CONFIG_SYS_MAX_FLASH_SECT:
wdenkc6097192002-11-03 00:24:07 +00003093 Max number of sectors on a Flash chip
3094
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003095- CONFIG_SYS_FLASH_ERASE_TOUT:
wdenkc6097192002-11-03 00:24:07 +00003096 Timeout for Flash erase operations (in ms)
3097
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003098- CONFIG_SYS_FLASH_WRITE_TOUT:
wdenkc6097192002-11-03 00:24:07 +00003099 Timeout for Flash write operations (in ms)
3100
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003101- CONFIG_SYS_FLASH_LOCK_TOUT
wdenkdccbda02003-07-14 22:13:32 +00003102 Timeout for Flash set sector lock bit operation (in ms)
3103
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003104- CONFIG_SYS_FLASH_UNLOCK_TOUT
wdenkdccbda02003-07-14 22:13:32 +00003105 Timeout for Flash clear lock bits operation (in ms)
3106
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003107- CONFIG_SYS_FLASH_PROTECTION
wdenkdccbda02003-07-14 22:13:32 +00003108 If defined, hardware flash sectors protection is used
3109 instead of U-Boot software protection.
3110
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003111- CONFIG_SYS_DIRECT_FLASH_TFTP:
wdenkc6097192002-11-03 00:24:07 +00003112
3113 Enable TFTP transfers directly to flash memory;
3114 without this option such a download has to be
3115 performed in two steps: (1) download to RAM, and (2)
3116 copy from RAM to flash.
3117
3118 The two-step approach is usually more reliable, since
3119 you can check if the download worked before you erase
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02003120 the flash, but in some situations (when system RAM is
3121 too limited to allow for a temporary copy of the
wdenkc6097192002-11-03 00:24:07 +00003122 downloaded image) this option may be very useful.
3123
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003124- CONFIG_SYS_FLASH_CFI:
wdenk4a5c8a72003-03-06 00:02:04 +00003125 Define if the flash driver uses extra elements in the
wdenk2cefd152004-02-08 22:55:38 +00003126 common flash structure for storing flash geometry.
3127
Jean-Christophe PLAGNIOL-VILLARD8d94c232008-08-13 01:40:42 +02003128- CONFIG_FLASH_CFI_DRIVER
wdenk2cefd152004-02-08 22:55:38 +00003129 This option also enables the building of the cfi_flash driver
3130 in the drivers directory
wdenkc6097192002-11-03 00:24:07 +00003131
Piotr Ziecik3e939e92008-11-17 15:57:58 +01003132- CONFIG_FLASH_CFI_MTD
3133 This option enables the building of the cfi_mtd driver
3134 in the drivers directory. The driver exports CFI flash
3135 to the MTD layer.
3136
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003137- CONFIG_SYS_FLASH_USE_BUFFER_WRITE
Guennadi Liakhovetski183284f2008-04-03 13:36:02 +02003138 Use buffered writes to flash.
3139
3140- CONFIG_FLASH_SPANSION_S29WS_N
3141 s29ws-n MirrorBit flash has non-standard addresses for buffered
3142 write commands.
3143
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003144- CONFIG_SYS_FLASH_QUIET_TEST
Stefan Roesec443fe92005-11-22 13:20:42 +01003145 If this option is defined, the common CFI flash doesn't
3146 print it's warning upon not recognized FLASH banks. This
3147 is useful, if some of the configured banks are only
3148 optionally available.
3149
Jerry Van Barenaae73572008-03-08 13:48:01 -05003150- CONFIG_FLASH_SHOW_PROGRESS
3151 If defined (must be an integer), print out countdown
3152 digits and dots. Recommended value: 45 (9..1) for 80
3153 column displays, 15 (3..1) for 40 column displays.
3154
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003155- CONFIG_SYS_RX_ETH_BUFFER:
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02003156 Defines the number of Ethernet receive buffers. On some
3157 Ethernet controllers it is recommended to set this value
stroese94ef1cf2003-06-05 15:39:44 +00003158 to 8 or even higher (EEPRO100 or 405 EMAC), since all
3159 buffers can be full shortly after enabling the interface
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02003160 on high Ethernet traffic.
stroese94ef1cf2003-06-05 15:39:44 +00003161 Defaults to 4 if not defined.
3162
Wolfgang Denk460a9ff2010-06-20 23:33:59 +02003163- CONFIG_ENV_MAX_ENTRIES
3164
Wolfgang Denk1136f692010-10-27 22:48:30 +02003165 Maximum number of entries in the hash table that is used
3166 internally to store the environment settings. The default
3167 setting is supposed to be generous and should work in most
3168 cases. This setting can be used to tune behaviour; see
3169 lib/hashtable.c for details.
Wolfgang Denk460a9ff2010-06-20 23:33:59 +02003170
Joe Hershberger71497d02012-12-11 22:16:31 -06003171- CONFIG_ENV_FLAGS_LIST_DEFAULT
3172- CONFIG_ENV_FLAGS_LIST_STATIC
3173 Enable validation of the values given to enviroment variables when
3174 calling env set. Variables can be restricted to only decimal,
3175 hexadecimal, or boolean. If CONFIG_CMD_NET is also defined,
3176 the variables can also be restricted to IP address or MAC address.
3177
3178 The format of the list is:
3179 type_attribute = [s|d|x|b|i|m]
Joe Hershberger6fe26c92012-12-11 22:16:34 -06003180 access_atribute = [a|r|o|c]
3181 attributes = type_attribute[access_atribute]
Joe Hershberger71497d02012-12-11 22:16:31 -06003182 entry = variable_name[:attributes]
3183 list = entry[,list]
3184
3185 The type attributes are:
3186 s - String (default)
3187 d - Decimal
3188 x - Hexadecimal
3189 b - Boolean ([1yYtT|0nNfF])
3190 i - IP address
3191 m - MAC address
3192
Joe Hershberger6fe26c92012-12-11 22:16:34 -06003193 The access attributes are:
3194 a - Any (default)
3195 r - Read-only
3196 o - Write-once
3197 c - Change-default
3198
Joe Hershberger71497d02012-12-11 22:16:31 -06003199 - CONFIG_ENV_FLAGS_LIST_DEFAULT
3200 Define this to a list (string) to define the ".flags"
3201 envirnoment variable in the default or embedded environment.
3202
3203 - CONFIG_ENV_FLAGS_LIST_STATIC
3204 Define this to a list (string) to define validation that
3205 should be done if an entry is not found in the ".flags"
3206 environment variable. To override a setting in the static
3207 list, simply add an entry for the same variable name to the
3208 ".flags" variable.
3209
Joe Hershberger6fe26c92012-12-11 22:16:34 -06003210- CONFIG_ENV_ACCESS_IGNORE_FORCE
3211 If defined, don't allow the -f switch to env set override variable
3212 access flags.
3213
wdenkc6097192002-11-03 00:24:07 +00003214The following definitions that deal with the placement and management
3215of environment data (variable area); in general, we support the
3216following configurations:
3217
Mike Frysinger63b8f122011-07-08 10:44:25 +00003218- CONFIG_BUILD_ENVCRC:
3219
3220 Builds up envcrc with the target environment so that external utils
3221 may easily extract it and embed it in final U-Boot images.
3222
Jean-Christophe PLAGNIOL-VILLARD53db4cd2008-09-10 22:48:04 +02003223- CONFIG_ENV_IS_IN_FLASH:
wdenkc6097192002-11-03 00:24:07 +00003224
3225 Define this if the environment is in flash memory.
3226
3227 a) The environment occupies one whole flash sector, which is
3228 "embedded" in the text segment with the U-Boot code. This
3229 happens usually with "bottom boot sector" or "top boot
3230 sector" type flash chips, which have several smaller
3231 sectors at the start or the end. For instance, such a
3232 layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
3233 such a case you would place the environment in one of the
3234 4 kB sectors - with U-Boot code before and after it. With
3235 "top boot sector" type flash chips, you would put the
3236 environment in one of the last sectors, leaving a gap
3237 between U-Boot and the environment.
3238
Jean-Christophe PLAGNIOL-VILLARD7e1cda62008-09-10 22:48:06 +02003239 - CONFIG_ENV_OFFSET:
wdenkc6097192002-11-03 00:24:07 +00003240
3241 Offset of environment data (variable area) to the
3242 beginning of flash memory; for instance, with bottom boot
3243 type flash chips the second sector can be used: the offset
3244 for this sector is given here.
3245
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003246 CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
wdenkc6097192002-11-03 00:24:07 +00003247
Jean-Christophe PLAGNIOL-VILLARD7e1cda62008-09-10 22:48:06 +02003248 - CONFIG_ENV_ADDR:
wdenkc6097192002-11-03 00:24:07 +00003249
3250 This is just another way to specify the start address of
3251 the flash sector containing the environment (instead of
Jean-Christophe PLAGNIOL-VILLARD7e1cda62008-09-10 22:48:06 +02003252 CONFIG_ENV_OFFSET).
wdenkc6097192002-11-03 00:24:07 +00003253
Jean-Christophe PLAGNIOL-VILLARD7e1cda62008-09-10 22:48:06 +02003254 - CONFIG_ENV_SECT_SIZE:
wdenkc6097192002-11-03 00:24:07 +00003255
3256 Size of the sector containing the environment.
3257
3258
3259 b) Sometimes flash chips have few, equal sized, BIG sectors.
3260 In such a case you don't want to spend a whole sector for
3261 the environment.
3262
Jean-Christophe PLAGNIOL-VILLARD7e1cda62008-09-10 22:48:06 +02003263 - CONFIG_ENV_SIZE:
wdenkc6097192002-11-03 00:24:07 +00003264
Jean-Christophe PLAGNIOL-VILLARD53db4cd2008-09-10 22:48:04 +02003265 If you use this in combination with CONFIG_ENV_IS_IN_FLASH
Jean-Christophe PLAGNIOL-VILLARD7e1cda62008-09-10 22:48:06 +02003266 and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
wdenkc6097192002-11-03 00:24:07 +00003267 of this flash sector for the environment. This saves
3268 memory for the RAM copy of the environment.
3269
3270 It may also save flash memory if you decide to use this
3271 when your environment is "embedded" within U-Boot code,
3272 since then the remainder of the flash sector could be used
3273 for U-Boot code. It should be pointed out that this is
3274 STRONGLY DISCOURAGED from a robustness point of view:
3275 updating the environment in flash makes it always
3276 necessary to erase the WHOLE sector. If something goes
3277 wrong before the contents has been restored from a copy in
3278 RAM, your target system will be dead.
3279
Jean-Christophe PLAGNIOL-VILLARD7e1cda62008-09-10 22:48:06 +02003280 - CONFIG_ENV_ADDR_REDUND
3281 CONFIG_ENV_SIZE_REDUND
wdenkc6097192002-11-03 00:24:07 +00003282
wdenk4a5c8a72003-03-06 00:02:04 +00003283 These settings describe a second storage area used to hold
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02003284 a redundant copy of the environment data, so that there is
wdenkb02744a2003-04-05 00:53:31 +00003285 a valid backup copy in case there is a power failure during
wdenk4a5c8a72003-03-06 00:02:04 +00003286 a "saveenv" operation.
wdenkc6097192002-11-03 00:24:07 +00003287
3288BE CAREFUL! Any changes to the flash layout, and some changes to the
3289source code will make it necessary to adapt <board>/u-boot.lds*
3290accordingly!
3291
3292
Jean-Christophe PLAGNIOL-VILLARDfdb79c32008-09-10 22:47:59 +02003293- CONFIG_ENV_IS_IN_NVRAM:
wdenkc6097192002-11-03 00:24:07 +00003294
3295 Define this if you have some non-volatile memory device
3296 (NVRAM, battery buffered SRAM) which you want to use for the
3297 environment.
3298
Jean-Christophe PLAGNIOL-VILLARD7e1cda62008-09-10 22:48:06 +02003299 - CONFIG_ENV_ADDR:
3300 - CONFIG_ENV_SIZE:
wdenkc6097192002-11-03 00:24:07 +00003301
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02003302 These two #defines are used to determine the memory area you
wdenkc6097192002-11-03 00:24:07 +00003303 want to use for environment. It is assumed that this memory
3304 can just be read and written to, without any special
3305 provision.
3306
3307BE CAREFUL! The first access to the environment happens quite early
3308in U-Boot initalization (when we try to get the setting of for the
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02003309console baudrate). You *MUST* have mapped your NVRAM area then, or
wdenkc6097192002-11-03 00:24:07 +00003310U-Boot will hang.
3311
3312Please note that even with NVRAM we still use a copy of the
3313environment in RAM: we could work on NVRAM directly, but we want to
3314keep settings there always unmodified except somebody uses "saveenv"
3315to save the current settings.
3316
3317
Jean-Christophe PLAGNIOL-VILLARDe46af642008-09-05 09:19:30 +02003318- CONFIG_ENV_IS_IN_EEPROM:
wdenkc6097192002-11-03 00:24:07 +00003319
3320 Use this if you have an EEPROM or similar serial access
3321 device and a driver for it.
3322
Jean-Christophe PLAGNIOL-VILLARD7e1cda62008-09-10 22:48:06 +02003323 - CONFIG_ENV_OFFSET:
3324 - CONFIG_ENV_SIZE:
wdenkc6097192002-11-03 00:24:07 +00003325
3326 These two #defines specify the offset and size of the
3327 environment area within the total memory of your EEPROM.
3328
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003329 - CONFIG_SYS_I2C_EEPROM_ADDR:
wdenkc6097192002-11-03 00:24:07 +00003330 If defined, specified the chip address of the EEPROM device.
3331 The default address is zero.
3332
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003333 - CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
wdenkc6097192002-11-03 00:24:07 +00003334 If defined, the number of bits used to address bytes in a
3335 single page in the EEPROM device. A 64 byte page, for example
3336 would require six bits.
3337
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003338 - CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
wdenkc6097192002-11-03 00:24:07 +00003339 If defined, the number of milliseconds to delay between
wdenk544e9732004-02-06 23:19:44 +00003340 page writes. The default is zero milliseconds.
wdenkc6097192002-11-03 00:24:07 +00003341
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003342 - CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
wdenkc6097192002-11-03 00:24:07 +00003343 The length in bytes of the EEPROM memory array address. Note
3344 that this is NOT the chip address length!
3345
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003346 - CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
wdenk20c98a62004-04-23 20:32:05 +00003347 EEPROM chips that implement "address overflow" are ones
3348 like Catalyst 24WC04/08/16 which has 9/10/11 bits of
3349 address and the extra bits end up in the "chip address" bit
3350 slots. This makes a 24WC08 (1Kbyte) chip look like four 256
3351 byte chips.
3352
3353 Note that we consider the length of the address field to
3354 still be one byte because the extra address bits are hidden
3355 in the chip address.
3356
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003357 - CONFIG_SYS_EEPROM_SIZE:
wdenkc6097192002-11-03 00:24:07 +00003358 The size in bytes of the EEPROM device.
3359
Heiko Schocher9bb0dd52010-01-07 08:55:40 +01003360 - CONFIG_ENV_EEPROM_IS_ON_I2C
3361 define this, if you have I2C and SPI activated, and your
3362 EEPROM, which holds the environment, is on the I2C bus.
3363
3364 - CONFIG_I2C_ENV_EEPROM_BUS
3365 if you have an Environment on an EEPROM reached over
3366 I2C muxes, you can define here, how to reach this
3367 EEPROM. For example:
3368
Wolfgang Denk16fa98a2010-06-13 17:48:15 +02003369 #define CONFIG_I2C_ENV_EEPROM_BUS "pca9547:70:d\0"
Heiko Schocher9bb0dd52010-01-07 08:55:40 +01003370
3371 EEPROM which holds the environment, is reached over
3372 a pca9547 i2c mux with address 0x70, channel 3.
wdenkc6097192002-11-03 00:24:07 +00003373
Jean-Christophe PLAGNIOL-VILLARD2b14d2b2008-09-10 22:47:58 +02003374- CONFIG_ENV_IS_IN_DATAFLASH:
wdenk86765902003-12-06 23:55:10 +00003375
wdenk1ebf41e2004-01-02 14:00:00 +00003376 Define this if you have a DataFlash memory device which you
wdenk86765902003-12-06 23:55:10 +00003377 want to use for the environment.
3378
Jean-Christophe PLAGNIOL-VILLARD7e1cda62008-09-10 22:48:06 +02003379 - CONFIG_ENV_OFFSET:
3380 - CONFIG_ENV_ADDR:
3381 - CONFIG_ENV_SIZE:
wdenk86765902003-12-06 23:55:10 +00003382
3383 These three #defines specify the offset and size of the
3384 environment area within the total memory of your DataFlash placed
3385 at the specified address.
3386
Liu Gang85bcd732012-03-08 00:33:20 +00003387- CONFIG_ENV_IS_IN_REMOTE:
3388
3389 Define this if you have a remote memory space which you
3390 want to use for the local device's environment.
3391
3392 - CONFIG_ENV_ADDR:
3393 - CONFIG_ENV_SIZE:
3394
3395 These two #defines specify the address and size of the
3396 environment area within the remote memory space. The
3397 local device can get the environment from remote memory
Liu Gang357bf5a2012-08-09 05:10:01 +00003398 space by SRIO or PCIE links.
Liu Gang85bcd732012-03-08 00:33:20 +00003399
3400BE CAREFUL! For some special cases, the local device can not use
3401"saveenv" command. For example, the local device will get the
Liu Gang357bf5a2012-08-09 05:10:01 +00003402environment stored in a remote NOR flash by SRIO or PCIE link,
3403but it can not erase, write this NOR flash by SRIO or PCIE interface.
Liu Gang85bcd732012-03-08 00:33:20 +00003404
Jean-Christophe PLAGNIOL-VILLARDdda84dd2008-09-10 22:47:58 +02003405- CONFIG_ENV_IS_IN_NAND:
wdenk79b59372004-06-09 14:58:14 +00003406
3407 Define this if you have a NAND device which you want to use
3408 for the environment.
3409
Jean-Christophe PLAGNIOL-VILLARD7e1cda62008-09-10 22:48:06 +02003410 - CONFIG_ENV_OFFSET:
3411 - CONFIG_ENV_SIZE:
wdenk79b59372004-06-09 14:58:14 +00003412
3413 These two #defines specify the offset and size of the environment
Scott Wood08239322010-09-17 14:38:37 -05003414 area within the first NAND device. CONFIG_ENV_OFFSET must be
3415 aligned to an erase block boundary.
wdenk86765902003-12-06 23:55:10 +00003416
Scott Wood08239322010-09-17 14:38:37 -05003417 - CONFIG_ENV_OFFSET_REDUND (optional):
Markus Klotzbuecher5d113e02006-03-20 18:02:44 +01003418
Jean-Christophe PLAGNIOL-VILLARD7e1cda62008-09-10 22:48:06 +02003419 This setting describes a second storage area of CONFIG_ENV_SIZE
Scott Wood08239322010-09-17 14:38:37 -05003420 size used to hold a redundant copy of the environment data, so
3421 that there is a valid backup copy in case there is a power failure
Wolfgang Denk092ae952011-10-26 10:21:21 +00003422 during a "saveenv" operation. CONFIG_ENV_OFFSET_RENDUND must be
Scott Wood08239322010-09-17 14:38:37 -05003423 aligned to an erase block boundary.
3424
3425 - CONFIG_ENV_RANGE (optional):
3426
3427 Specifies the length of the region in which the environment
3428 can be written. This should be a multiple of the NAND device's
3429 block size. Specifying a range with more erase blocks than
3430 are needed to hold CONFIG_ENV_SIZE allows bad blocks within
3431 the range to be avoided.
3432
3433 - CONFIG_ENV_OFFSET_OOB (optional):
Markus Klotzbuecher5d113e02006-03-20 18:02:44 +01003434
Scott Wood08239322010-09-17 14:38:37 -05003435 Enables support for dynamically retrieving the offset of the
3436 environment from block zero's out-of-band data. The
3437 "nand env.oob" command can be used to record this offset.
3438 Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
3439 using CONFIG_ENV_OFFSET_OOB.
Markus Klotzbuecher5d113e02006-03-20 18:02:44 +01003440
Guennadi Liakhovetskifad24442009-05-18 16:07:22 +02003441- CONFIG_NAND_ENV_DST
3442
3443 Defines address in RAM to which the nand_spl code should copy the
3444 environment. If redundant environment is used, it will be copied to
3445 CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
3446
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003447- CONFIG_SYS_SPI_INIT_OFFSET
wdenkc6097192002-11-03 00:24:07 +00003448
3449 Defines offset to the initial SPI buffer area in DPRAM. The
3450 area is used at an early stage (ROM part) if the environment
3451 is configured to reside in the SPI EEPROM: We need a 520 byte
3452 scratch DPRAM area. It is used between the two initialization
3453 calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
3454 to be a good choice since it makes it far enough from the
3455 start of the data area as well as from the stack pointer.
3456
Bruce Adleredecc942007-11-02 13:15:42 -07003457Please note that the environment is read-only until the monitor
wdenkc6097192002-11-03 00:24:07 +00003458has been relocated to RAM and a RAM copy of the environment has been
Wolfgang Denk76af2782010-07-24 21:55:43 +02003459created; also, when using EEPROM you will have to use getenv_f()
wdenkc6097192002-11-03 00:24:07 +00003460until then to read environment variables.
3461
wdenk8dba0502003-03-31 16:34:49 +00003462The environment is protected by a CRC32 checksum. Before the monitor
3463is relocated into RAM, as a result of a bad CRC you will be working
3464with the compiled-in default environment - *silently*!!! [This is
3465necessary, because the first environment variable we need is the
3466"baudrate" setting for the console - if we have a bad CRC, we don't
3467have any device yet where we could complain.]
wdenkc6097192002-11-03 00:24:07 +00003468
3469Note: once the monitor has been relocated, then it will complain if
3470the default environment is used; a new CRC is computed as soon as you
wdenk8dba0502003-03-31 16:34:49 +00003471use the "saveenv" command to store a valid environment.
wdenkc6097192002-11-03 00:24:07 +00003472
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003473- CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
wdenk9c53f402003-10-15 23:53:47 +00003474 Echo the inverted Ethernet link state to the fault LED.
wdenk49c3f672003-10-08 22:33:00 +00003475
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003476 Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
wdenk49c3f672003-10-08 22:33:00 +00003477 also needs to be defined.
3478
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003479- CONFIG_SYS_FAULT_MII_ADDR:
wdenk9c53f402003-10-15 23:53:47 +00003480 MII address of the PHY to check for the Ethernet link state.
wdenkc6097192002-11-03 00:24:07 +00003481
Ron Madriddfa028a2009-02-18 14:30:44 -08003482- CONFIG_NS16550_MIN_FUNCTIONS:
3483 Define this if you desire to only have use of the NS16550_init
3484 and NS16550_putc functions for the serial driver located at
3485 drivers/serial/ns16550.c. This option is useful for saving
3486 space for already greatly restricted images, including but not
3487 limited to NAND_SPL configurations.
3488
Simon Glass28a9e332012-11-30 13:01:18 +00003489- CONFIG_DISPLAY_BOARDINFO
3490 Display information about the board that U-Boot is running on
3491 when U-Boot starts up. The board function checkboard() is called
3492 to do this.
3493
Simon Glasse8822012012-11-30 13:01:19 +00003494- CONFIG_DISPLAY_BOARDINFO_LATE
3495 Similar to the previous option, but display this information
3496 later, once stdio is running and output goes to the LCD, if
3497 present.
3498
wdenkc6097192002-11-03 00:24:07 +00003499Low Level (hardware related) configuration options:
wdenkc8434db2003-03-26 06:55:25 +00003500---------------------------------------------------
wdenkc6097192002-11-03 00:24:07 +00003501
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003502- CONFIG_SYS_CACHELINE_SIZE:
wdenkc6097192002-11-03 00:24:07 +00003503 Cache Line Size of the CPU.
3504
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003505- CONFIG_SYS_DEFAULT_IMMR:
wdenkc6097192002-11-03 00:24:07 +00003506 Default address of the IMMR after system reset.
wdenk2bb11052003-07-17 23:16:40 +00003507
wdenk9c53f402003-10-15 23:53:47 +00003508 Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
3509 and RPXsuper) to be able to adjust the position of
3510 the IMMR register after a reset.
wdenkc6097192002-11-03 00:24:07 +00003511
Timur Tabid8f341c2011-08-04 18:03:41 -05003512- CONFIG_SYS_CCSRBAR_DEFAULT:
3513 Default (power-on reset) physical address of CCSR on Freescale
3514 PowerPC SOCs.
3515
3516- CONFIG_SYS_CCSRBAR:
3517 Virtual address of CCSR. On a 32-bit build, this is typically
3518 the same value as CONFIG_SYS_CCSRBAR_DEFAULT.
3519
3520 CONFIG_SYS_DEFAULT_IMMR must also be set to this value,
3521 for cross-platform code that uses that macro instead.
3522
3523- CONFIG_SYS_CCSRBAR_PHYS:
3524 Physical address of CCSR. CCSR can be relocated to a new
3525 physical address, if desired. In this case, this macro should
Wolfgang Denk092ae952011-10-26 10:21:21 +00003526 be set to that address. Otherwise, it should be set to the
Timur Tabid8f341c2011-08-04 18:03:41 -05003527 same value as CONFIG_SYS_CCSRBAR_DEFAULT. For example, CCSR
3528 is typically relocated on 36-bit builds. It is recommended
3529 that this macro be defined via the _HIGH and _LOW macros:
3530
3531 #define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH
3532 * 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW)
3533
3534- CONFIG_SYS_CCSRBAR_PHYS_HIGH:
Wolfgang Denkd590fb12011-10-07 09:58:21 +02003535 Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS. This value is typically
3536 either 0 (32-bit build) or 0xF (36-bit build). This macro is
Timur Tabid8f341c2011-08-04 18:03:41 -05003537 used in assembly code, so it must not contain typecasts or
3538 integer size suffixes (e.g. "ULL").
3539
3540- CONFIG_SYS_CCSRBAR_PHYS_LOW:
3541 Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS. This macro is
3542 used in assembly code, so it must not contain typecasts or
3543 integer size suffixes (e.g. "ULL").
3544
3545- CONFIG_SYS_CCSR_DO_NOT_RELOCATE:
3546 If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be
3547 forced to a value that ensures that CCSR is not relocated.
3548
wdenk1272e232002-11-10 22:06:23 +00003549- Floppy Disk Support:
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003550 CONFIG_SYS_FDC_DRIVE_NUMBER
wdenk1272e232002-11-10 22:06:23 +00003551
3552 the default drive number (default value 0)
3553
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003554 CONFIG_SYS_ISA_IO_STRIDE
wdenk1272e232002-11-10 22:06:23 +00003555
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02003556 defines the spacing between FDC chipset registers
wdenk1272e232002-11-10 22:06:23 +00003557 (default value 1)
3558
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003559 CONFIG_SYS_ISA_IO_OFFSET
wdenk1272e232002-11-10 22:06:23 +00003560
wdenk4a5c8a72003-03-06 00:02:04 +00003561 defines the offset of register from address. It
3562 depends on which part of the data bus is connected to
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02003563 the FDC chipset. (default value 0)
wdenk1272e232002-11-10 22:06:23 +00003564
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003565 If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
3566 CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
wdenk4a5c8a72003-03-06 00:02:04 +00003567 default value.
wdenk1272e232002-11-10 22:06:23 +00003568
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003569 if CONFIG_SYS_FDC_HW_INIT is defined, then the function
wdenk4a5c8a72003-03-06 00:02:04 +00003570 fdc_hw_init() is called at the beginning of the FDC
3571 setup. fdc_hw_init() must be provided by the board
3572 source code. It is used to make hardware dependant
3573 initializations.
wdenk1272e232002-11-10 22:06:23 +00003574
Macpaul Lind1e49942011-04-11 20:45:32 +00003575- CONFIG_IDE_AHB:
3576 Most IDE controllers were designed to be connected with PCI
3577 interface. Only few of them were designed for AHB interface.
3578 When software is doing ATA command and data transfer to
3579 IDE devices through IDE-AHB controller, some additional
3580 registers accessing to these kind of IDE-AHB controller
3581 is requierd.
3582
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003583- CONFIG_SYS_IMMR: Physical address of the Internal Memory.
wdenk07d7e6b2004-12-16 21:44:03 +00003584 DO NOT CHANGE unless you know exactly what you're
wdenkb3a4a702004-12-10 11:40:40 +00003585 doing! (11-4) [MPC8xx/82xx systems only]
wdenkc6097192002-11-03 00:24:07 +00003586
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003587- CONFIG_SYS_INIT_RAM_ADDR:
wdenkc6097192002-11-03 00:24:07 +00003588
wdenkeb20ad32003-09-05 23:19:14 +00003589 Start address of memory area that can be used for
wdenkc6097192002-11-03 00:24:07 +00003590 initial data and stack; please note that this must be
3591 writable memory that is working WITHOUT special
3592 initialization, i. e. you CANNOT use normal RAM which
3593 will become available only after programming the
3594 memory controller and running certain initialization
3595 sequences.
3596
3597 U-Boot uses the following memory types:
3598 - MPC8xx and MPC8260: IMMR (internal memory of the CPU)
3599 - MPC824X: data cache
3600 - PPC4xx: data cache
3601
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003602- CONFIG_SYS_GBL_DATA_OFFSET:
wdenkc6097192002-11-03 00:24:07 +00003603
3604 Offset of the initial data structure in the memory
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003605 area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
3606 CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
wdenkc6097192002-11-03 00:24:07 +00003607 data is located at the end of the available space
Wolfgang Denk1c2e98e2010-10-26 13:32:32 +02003608 (sometimes written as (CONFIG_SYS_INIT_RAM_SIZE -
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003609 CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
3610 below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
3611 CONFIG_SYS_GBL_DATA_OFFSET) downward.
wdenkc6097192002-11-03 00:24:07 +00003612
3613 Note:
3614 On the MPC824X (or other systems that use the data
3615 cache for initial memory) the address chosen for
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003616 CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
wdenkc6097192002-11-03 00:24:07 +00003617 point to an otherwise UNUSED address space between
3618 the top of RAM and the start of the PCI space.
3619
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003620- CONFIG_SYS_SIUMCR: SIU Module Configuration (11-6)
wdenkc6097192002-11-03 00:24:07 +00003621
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003622- CONFIG_SYS_SYPCR: System Protection Control (11-9)
wdenkc6097192002-11-03 00:24:07 +00003623
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003624- CONFIG_SYS_TBSCR: Time Base Status and Control (11-26)
wdenkc6097192002-11-03 00:24:07 +00003625
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003626- CONFIG_SYS_PISCR: Periodic Interrupt Status and Control (11-31)
wdenkc6097192002-11-03 00:24:07 +00003627
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003628- CONFIG_SYS_PLPRCR: PLL, Low-Power, and Reset Control Register (15-30)
wdenkc6097192002-11-03 00:24:07 +00003629
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003630- CONFIG_SYS_SCCR: System Clock and reset Control Register (15-27)
wdenkc6097192002-11-03 00:24:07 +00003631
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003632- CONFIG_SYS_OR_TIMING_SDRAM:
wdenkc6097192002-11-03 00:24:07 +00003633 SDRAM timing
3634
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003635- CONFIG_SYS_MAMR_PTA:
wdenkc6097192002-11-03 00:24:07 +00003636 periodic timer for refresh
3637
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003638- CONFIG_SYS_DER: Debug Event Register (37-47)
wdenkc6097192002-11-03 00:24:07 +00003639
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003640- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
3641 CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
3642 CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
3643 CONFIG_SYS_BR1_PRELIM:
wdenkc6097192002-11-03 00:24:07 +00003644 Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
3645
3646- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003647 CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
3648 CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
wdenkc6097192002-11-03 00:24:07 +00003649 Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
3650
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003651- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
3652 CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
wdenkc6097192002-11-03 00:24:07 +00003653 Machine Mode Register and Memory Periodic Timer
3654 Prescaler definitions (SDRAM timing)
3655
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003656- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
wdenkc6097192002-11-03 00:24:07 +00003657 enable I2C microcode relocation patch (MPC8xx);
3658 define relocation offset in DPRAM [DSP2]
3659
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003660- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
Heiko Schocherc8148ed2008-01-11 01:12:07 +01003661 enable SMC microcode relocation patch (MPC8xx);
3662 define relocation offset in DPRAM [SMC1]
3663
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003664- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
wdenkc6097192002-11-03 00:24:07 +00003665 enable SPI microcode relocation patch (MPC8xx);
3666 define relocation offset in DPRAM [SCC4]
3667
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003668- CONFIG_SYS_USE_OSCCLK:
wdenkc6097192002-11-03 00:24:07 +00003669 Use OSCM clock mode on MBX8xx board. Be careful,
3670 wrong setting might damage your board. Read
3671 doc/README.MBX before setting this variable!
3672
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003673- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
wdenk4a5c8a72003-03-06 00:02:04 +00003674 Offset of the bootmode word in DPRAM used by post
3675 (Power On Self Tests). This definition overrides
3676 #define'd default value in commproc.h resp.
3677 cpm_8260.h.
wdenk2029f4d2002-11-21 23:11:29 +00003678
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003679- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
3680 CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
3681 CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
3682 CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
3683 CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
3684 CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
3685 CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
3686 CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
Stefan Roese88fbf932010-04-15 16:07:28 +02003687 Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set.
wdenkbf2f8c92003-05-22 22:52:13 +00003688
Dirk Eibach378d1ca2009-02-09 08:18:34 +01003689- CONFIG_PCI_DISABLE_PCIE:
3690 Disable PCI-Express on systems where it is supported but not
3691 required.
3692
Andrew Sharp61d47ca2012-08-29 14:16:32 +00003693- CONFIG_PCI_ENUM_ONLY
3694 Only scan through and get the devices on the busses.
3695 Don't do any setup work, presumably because someone or
3696 something has already done it, and we don't need to do it
3697 a second time. Useful for platforms that are pre-booted
3698 by coreboot or similar.
3699
Kumar Gala8975d7a2010-12-30 12:09:53 -06003700- CONFIG_SYS_SRIO:
3701 Chip has SRIO or not
3702
3703- CONFIG_SRIO1:
3704 Board has SRIO 1 port available
3705
3706- CONFIG_SRIO2:
3707 Board has SRIO 2 port available
3708
3709- CONFIG_SYS_SRIOn_MEM_VIRT:
3710 Virtual Address of SRIO port 'n' memory region
3711
3712- CONFIG_SYS_SRIOn_MEM_PHYS:
3713 Physical Address of SRIO port 'n' memory region
3714
3715- CONFIG_SYS_SRIOn_MEM_SIZE:
3716 Size of SRIO port 'n' memory region
3717
Alex Watermancd6aae32011-05-19 15:08:36 -04003718- CONFIG_SYS_NDFC_16
3719 Defined to tell the NDFC that the NAND chip is using a
3720 16 bit bus.
3721
3722- CONFIG_SYS_NDFC_EBC0_CFG
3723 Sets the EBC0_CFG register for the NDFC. If not defined
3724 a default value will be used.
3725
Ben Warren45657152006-09-07 16:50:54 -04003726- CONFIG_SPD_EEPROM
Wolfgang Denkb240aef2008-03-26 10:40:12 +01003727 Get DDR timing information from an I2C EEPROM. Common
3728 with pluggable memory modules such as SODIMMs
3729
Ben Warren45657152006-09-07 16:50:54 -04003730 SPD_EEPROM_ADDRESS
3731 I2C address of the SPD EEPROM
3732
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003733- CONFIG_SYS_SPD_BUS_NUM
Wolfgang Denkb240aef2008-03-26 10:40:12 +01003734 If SPD EEPROM is on an I2C bus other than the first
3735 one, specify here. Note that the value must resolve
3736 to something your driver can deal with.
Ben Warren45657152006-09-07 16:50:54 -04003737
York Sune73cc042011-06-07 09:42:16 +08003738- CONFIG_SYS_DDR_RAW_TIMING
3739 Get DDR timing information from other than SPD. Common with
3740 soldered DDR chips onboard without SPD. DDR raw timing
3741 parameters are extracted from datasheet and hard-coded into
3742 header files or board specific files.
3743
York Sunbd495cf2011-09-16 13:21:35 -07003744- CONFIG_FSL_DDR_INTERACTIVE
3745 Enable interactive DDR debugging. See doc/README.fsl-ddr.
3746
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003747- CONFIG_SYS_83XX_DDR_USES_CS0
Wolfgang Denkb240aef2008-03-26 10:40:12 +01003748 Only for 83xx systems. If specified, then DDR should
3749 be configured using CS0 and CS1 instead of CS2 and CS3.
Timur Tabi054838e2006-10-31 18:44:42 -06003750
wdenk6203e402004-04-18 10:13:26 +00003751- CONFIG_ETHER_ON_FEC[12]
3752 Define to enable FEC[12] on a 8xx series processor.
3753
3754- CONFIG_FEC[12]_PHY
3755 Define to the hardcoded PHY address which corresponds
wdenk05939202004-04-18 17:39:38 +00003756 to the given FEC; i. e.
3757 #define CONFIG_FEC1_PHY 4
wdenk6203e402004-04-18 10:13:26 +00003758 means that the PHY with address 4 is connected to FEC1
3759
3760 When set to -1, means to probe for first available.
3761
3762- CONFIG_FEC[12]_PHY_NORXERR
3763 The PHY does not have a RXERR line (RMII only).
3764 (so program the FEC to ignore it).
3765
3766- CONFIG_RMII
3767 Enable RMII mode for all FECs.
3768 Note that this is a global option, we can't
3769 have one FEC in standard MII mode and another in RMII mode.
3770
wdenk20c98a62004-04-23 20:32:05 +00003771- CONFIG_CRC32_VERIFY
3772 Add a verify option to the crc32 command.
3773 The syntax is:
3774
3775 => crc32 -v <address> <count> <crc32>
3776
3777 Where address/count indicate a memory area
3778 and crc32 is the correct crc32 which the
3779 area should have.
3780
wdenk64519362004-07-11 17:40:54 +00003781- CONFIG_LOOPW
3782 Add the "loopw" memory command. This only takes effect if
Jon Loeligerc1da5c92007-06-11 19:03:39 -05003783 the memory commands are activated globally (CONFIG_CMD_MEM).
wdenk64519362004-07-11 17:40:54 +00003784
stroesecc3af832004-12-16 18:46:55 +00003785- CONFIG_MX_CYCLIC
3786 Add the "mdc" and "mwc" memory commands. These are cyclic
3787 "md/mw" commands.
3788 Examples:
3789
wdenk07d7e6b2004-12-16 21:44:03 +00003790 => mdc.b 10 4 500
stroesecc3af832004-12-16 18:46:55 +00003791 This command will print 4 bytes (10,11,12,13) each 500 ms.
3792
wdenk07d7e6b2004-12-16 21:44:03 +00003793 => mwc.l 100 12345678 10
stroesecc3af832004-12-16 18:46:55 +00003794 This command will write 12345678 to address 100 all 10 ms.
3795
wdenk07d7e6b2004-12-16 21:44:03 +00003796 This only takes effect if the memory commands are activated
Jon Loeligerc1da5c92007-06-11 19:03:39 -05003797 globally (CONFIG_CMD_MEM).
stroesecc3af832004-12-16 18:46:55 +00003798
wdenk3d3d99f2005-04-04 12:44:11 +00003799- CONFIG_SKIP_LOWLEVEL_INIT
Macpaul Lin1cac36e2011-10-19 20:41:11 +00003800 [ARM, NDS32, MIPS only] If this variable is defined, then certain
Wolfgang Denk302141d2010-11-27 23:30:56 +01003801 low level initializations (like setting up the memory
3802 controller) are omitted and/or U-Boot does not
3803 relocate itself into RAM.
wdenk3d3d99f2005-04-04 12:44:11 +00003804
Wolfgang Denk302141d2010-11-27 23:30:56 +01003805 Normally this variable MUST NOT be defined. The only
3806 exception is when U-Boot is loaded (to RAM) by some
3807 other boot loader or by a debugger which performs
3808 these initializations itself.
wdenk3d3d99f2005-04-04 12:44:11 +00003809
Aneesh V552a3192011-07-13 05:11:07 +00003810- CONFIG_SPL_BUILD
Magnus Lilja1ec96d82009-06-13 20:50:00 +02003811 Modifies the behaviour of start.S when compiling a loader
3812 that is executed before the actual U-Boot. E.g. when
3813 compiling a NAND SPL.
wdenk336b2bc2005-04-02 23:52:25 +00003814
Simon Glass17dabf02013-02-24 17:33:14 +00003815- CONFIG_ARCH_MAP_SYSMEM
3816 Generally U-Boot (and in particular the md command) uses
3817 effective address. It is therefore not necessary to regard
3818 U-Boot address as virtual addresses that need to be translated
3819 to physical addresses. However, sandbox requires this, since
3820 it maintains its own little RAM buffer which contains all
3821 addressable memory. This option causes some memory accesses
3822 to be mapped through map_sysmem() / unmap_sysmem().
3823
Matthias Weisser93416c12011-03-10 21:36:32 +00003824- CONFIG_USE_ARCH_MEMCPY
3825 CONFIG_USE_ARCH_MEMSET
3826 If these options are used a optimized version of memcpy/memset will
3827 be used if available. These functions may be faster under some
3828 conditions but may increase the binary size.
3829
Simon Glassbfb59802013-02-14 04:18:54 +00003830- CONFIG_X86_RESET_VECTOR
3831 If defined, the x86 reset vector code is included. This is not
3832 needed when U-Boot is running from Coreboot.
Gabe Black14f82462012-11-27 21:08:06 +00003833
Gabe Black76ce2492012-11-29 16:23:41 +00003834
Timur Tabi275f4bb2011-11-22 09:21:25 -06003835Freescale QE/FMAN Firmware Support:
3836-----------------------------------
3837
3838The Freescale QUICCEngine (QE) and Frame Manager (FMAN) both support the
3839loading of "firmware", which is encoded in the QE firmware binary format.
3840This firmware often needs to be loaded during U-Boot booting, so macros
3841are used to identify the storage device (NOR flash, SPI, etc) and the address
3842within that device.
3843
3844- CONFIG_SYS_QE_FMAN_FW_ADDR
3845 The address in the storage device where the firmware is located. The
3846 meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro
3847 is also specified.
3848
3849- CONFIG_SYS_QE_FMAN_FW_LENGTH
3850 The maximum possible size of the firmware. The firmware binary format
3851 has a field that specifies the actual size of the firmware, but it
3852 might not be possible to read any part of the firmware unless some
3853 local storage is allocated to hold the entire firmware first.
3854
3855- CONFIG_SYS_QE_FMAN_FW_IN_NOR
3856 Specifies that QE/FMAN firmware is located in NOR flash, mapped as
3857 normal addressable memory via the LBC. CONFIG_SYS_FMAN_FW_ADDR is the
3858 virtual address in NOR flash.
3859
3860- CONFIG_SYS_QE_FMAN_FW_IN_NAND
3861 Specifies that QE/FMAN firmware is located in NAND flash.
3862 CONFIG_SYS_FMAN_FW_ADDR is the offset within NAND flash.
3863
3864- CONFIG_SYS_QE_FMAN_FW_IN_MMC
3865 Specifies that QE/FMAN firmware is located on the primary SD/MMC
3866 device. CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
3867
3868- CONFIG_SYS_QE_FMAN_FW_IN_SPIFLASH
3869 Specifies that QE/FMAN firmware is located on the primary SPI
3870 device. CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
3871
Liu Gang1e084582012-03-08 00:33:18 +00003872- CONFIG_SYS_QE_FMAN_FW_IN_REMOTE
3873 Specifies that QE/FMAN firmware is located in the remote (master)
3874 memory space. CONFIG_SYS_FMAN_FW_ADDR is a virtual address which
Liu Gang357bf5a2012-08-09 05:10:01 +00003875 can be mapped from slave TLB->slave LAW->slave SRIO or PCIE outbound
3876 window->master inbound window->master LAW->the ucode address in
3877 master's memory space.
Timur Tabi275f4bb2011-11-22 09:21:25 -06003878
wdenkc6097192002-11-03 00:24:07 +00003879Building the Software:
3880======================
3881
Wolfgang Denkb240aef2008-03-26 10:40:12 +01003882Building U-Boot has been tested in several native build environments
3883and in many different cross environments. Of course we cannot support
3884all possibly existing versions of cross development tools in all
3885(potentially obsolete) versions. In case of tool chain problems we
3886recommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
3887which is extensively used to build and test U-Boot.
wdenkc6097192002-11-03 00:24:07 +00003888
Wolfgang Denkb240aef2008-03-26 10:40:12 +01003889If you are not using a native environment, it is assumed that you
3890have GNU cross compiling tools available in your path. In this case,
3891you must set the environment variable CROSS_COMPILE in your shell.
3892Note that no changes to the Makefile or any other source files are
3893necessary. For example using the ELDK on a 4xx CPU, please enter:
wdenkc6097192002-11-03 00:24:07 +00003894
Wolfgang Denkb240aef2008-03-26 10:40:12 +01003895 $ CROSS_COMPILE=ppc_4xx-
3896 $ export CROSS_COMPILE
wdenkc6097192002-11-03 00:24:07 +00003897
Peter Tyserb06976d2009-03-13 18:54:51 -05003898Note: If you wish to generate Windows versions of the utilities in
3899 the tools directory you can use the MinGW toolchain
3900 (http://www.mingw.org). Set your HOST tools to the MinGW
3901 toolchain and execute 'make tools'. For example:
3902
3903 $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
3904
3905 Binaries such as tools/mkimage.exe will be created which can
3906 be executed on computers running Windows.
3907
Wolfgang Denkb240aef2008-03-26 10:40:12 +01003908U-Boot is intended to be simple to build. After installing the
3909sources you must configure U-Boot for one specific board type. This
wdenkc6097192002-11-03 00:24:07 +00003910is done by typing:
3911
3912 make NAME_config
3913
Wolfgang Denkb240aef2008-03-26 10:40:12 +01003914where "NAME_config" is the name of one of the existing configu-
Michael Jones5a7fb6f2012-03-15 22:48:10 +00003915rations; see boards.cfg for supported names.
wdenk2f0812d2003-10-08 22:45:44 +00003916
wdenk6c59edc2004-05-03 20:45:30 +00003917Note: for some board special configuration names may exist; check if
3918 additional information is available from the board vendor; for
3919 instance, the TQM823L systems are available without (standard)
3920 or with LCD support. You can select such additional "features"
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02003921 when choosing the configuration, i. e.
wdenkc6097192002-11-03 00:24:07 +00003922
wdenk6c59edc2004-05-03 20:45:30 +00003923 make TQM823L_config
3924 - will configure for a plain TQM823L, i. e. no LCD support
wdenkc6097192002-11-03 00:24:07 +00003925
wdenk6c59edc2004-05-03 20:45:30 +00003926 make TQM823L_LCD_config
3927 - will configure for a TQM823L with U-Boot console on LCD
wdenkc6097192002-11-03 00:24:07 +00003928
wdenk6c59edc2004-05-03 20:45:30 +00003929 etc.
wdenkc6097192002-11-03 00:24:07 +00003930
wdenkc6097192002-11-03 00:24:07 +00003931
wdenk6c59edc2004-05-03 20:45:30 +00003932Finally, type "make all", and you should get some working U-Boot
3933images ready for download to / installation on your system:
wdenkc6097192002-11-03 00:24:07 +00003934
wdenk6c59edc2004-05-03 20:45:30 +00003935- "u-boot.bin" is a raw binary image
3936- "u-boot" is an image in ELF binary format
3937- "u-boot.srec" is in Motorola S-Record format
wdenkc6097192002-11-03 00:24:07 +00003938
Marian Balakowiczefe063f2006-09-07 17:25:40 +02003939By default the build is performed locally and the objects are saved
3940in the source directory. One of the two methods can be used to change
3941this behavior and build U-Boot to some external directory:
3942
39431. Add O= to the make command line invocations:
3944
3945 make O=/tmp/build distclean
3946 make O=/tmp/build NAME_config
3947 make O=/tmp/build all
3948
39492. Set environment variable BUILD_DIR to point to the desired location:
3950
3951 export BUILD_DIR=/tmp/build
3952 make distclean
3953 make NAME_config
3954 make all
3955
3956Note that the command line "O=" setting overrides the BUILD_DIR environment
3957variable.
3958
wdenkc6097192002-11-03 00:24:07 +00003959
wdenk6c59edc2004-05-03 20:45:30 +00003960Please be aware that the Makefiles assume you are using GNU make, so
3961for instance on NetBSD you might need to use "gmake" instead of
3962native "make".
wdenkc6097192002-11-03 00:24:07 +00003963
wdenkc6097192002-11-03 00:24:07 +00003964
wdenk6c59edc2004-05-03 20:45:30 +00003965If the system board that you have is not listed, then you will need
3966to port U-Boot to your hardware platform. To do this, follow these
3967steps:
wdenkc6097192002-11-03 00:24:07 +00003968
wdenk6c59edc2004-05-03 20:45:30 +000039691. Add a new configuration option for your board to the toplevel
Michael Jones5a7fb6f2012-03-15 22:48:10 +00003970 "boards.cfg" file, using the existing entries as examples.
3971 Follow the instructions there to keep the boards in order.
wdenk6c59edc2004-05-03 20:45:30 +000039722. Create a new directory to hold your board specific code. Add any
3973 files you need. In your board directory, you will need at least
3974 the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
39753. Create a new configuration file "include/configs/<board>.h" for
3976 your board
39773. If you're porting U-Boot to a new CPU, then also create a new
3978 directory to hold your CPU specific code. Add any files you need.
39794. Run "make <board>_config" with your new name.
39805. Type "make", and you should get a working "u-boot.srec" file
3981 to be installed on your target system.
39826. Debug and solve any problems that might arise.
3983 [Of course, this last step is much harder than it sounds.]
wdenkc6097192002-11-03 00:24:07 +00003984
wdenkc6097192002-11-03 00:24:07 +00003985
wdenk6c59edc2004-05-03 20:45:30 +00003986Testing of U-Boot Modifications, Ports to New Hardware, etc.:
3987==============================================================
wdenkc6097192002-11-03 00:24:07 +00003988
Wolfgang Denkb240aef2008-03-26 10:40:12 +01003989If you have modified U-Boot sources (for instance added a new board
3990or support for new devices, a new CPU, etc.) you are expected to
wdenk6c59edc2004-05-03 20:45:30 +00003991provide feedback to the other developers. The feedback normally takes
3992the form of a "patch", i. e. a context diff against a certain (latest
Wolfgang Denkb240aef2008-03-26 10:40:12 +01003993official or latest in the git repository) version of U-Boot sources.
wdenkc6097192002-11-03 00:24:07 +00003994
Wolfgang Denkb240aef2008-03-26 10:40:12 +01003995But before you submit such a patch, please verify that your modifi-
3996cation did not break existing code. At least make sure that *ALL* of
wdenk6c59edc2004-05-03 20:45:30 +00003997the supported boards compile WITHOUT ANY compiler warnings. To do so,
3998just run the "MAKEALL" script, which will configure and build U-Boot
Wolfgang Denkb240aef2008-03-26 10:40:12 +01003999for ALL supported system. Be warned, this will take a while. You can
4000select which (cross) compiler to use by passing a `CROSS_COMPILE'
4001environment variable to the script, i. e. to use the ELDK cross tools
4002you can type
wdenkc6097192002-11-03 00:24:07 +00004003
wdenk6c59edc2004-05-03 20:45:30 +00004004 CROSS_COMPILE=ppc_8xx- MAKEALL
wdenkc6097192002-11-03 00:24:07 +00004005
wdenk6c59edc2004-05-03 20:45:30 +00004006or to build on a native PowerPC system you can type
wdenkc6097192002-11-03 00:24:07 +00004007
wdenk6c59edc2004-05-03 20:45:30 +00004008 CROSS_COMPILE=' ' MAKEALL
wdenkc6097192002-11-03 00:24:07 +00004009
Wolfgang Denkb240aef2008-03-26 10:40:12 +01004010When using the MAKEALL script, the default behaviour is to build
4011U-Boot in the source directory. This location can be changed by
4012setting the BUILD_DIR environment variable. Also, for each target
4013built, the MAKEALL script saves two log files (<target>.ERR and
4014<target>.MAKEALL) in the <source dir>/LOG directory. This default
4015location can be changed by setting the MAKEALL_LOGDIR environment
4016variable. For example:
Marian Balakowiczefe063f2006-09-07 17:25:40 +02004017
4018 export BUILD_DIR=/tmp/build
4019 export MAKEALL_LOGDIR=/tmp/log
4020 CROSS_COMPILE=ppc_8xx- MAKEALL
4021
Wolfgang Denkb240aef2008-03-26 10:40:12 +01004022With the above settings build objects are saved in the /tmp/build,
4023log files are saved in the /tmp/log and the source tree remains clean
4024during the whole build process.
Marian Balakowiczefe063f2006-09-07 17:25:40 +02004025
4026
wdenk6c59edc2004-05-03 20:45:30 +00004027See also "U-Boot Porting Guide" below.
wdenkc6097192002-11-03 00:24:07 +00004028
wdenkc6097192002-11-03 00:24:07 +00004029
wdenk6c59edc2004-05-03 20:45:30 +00004030Monitor Commands - Overview:
4031============================
wdenkc6097192002-11-03 00:24:07 +00004032
wdenk6c59edc2004-05-03 20:45:30 +00004033go - start application at address 'addr'
4034run - run commands in an environment variable
4035bootm - boot application image from memory
4036bootp - boot image via network using BootP/TFTP protocol
Marek Vasutcf41a9b2012-03-14 21:52:45 +00004037bootz - boot zImage from memory
wdenk6c59edc2004-05-03 20:45:30 +00004038tftpboot- boot image via network using TFTP protocol
4039 and env variables "ipaddr" and "serverip"
4040 (and eventually "gatewayip")
Simon Glass6a398d22011-10-24 18:00:07 +00004041tftpput - upload a file via network using TFTP protocol
wdenk6c59edc2004-05-03 20:45:30 +00004042rarpboot- boot image via network using RARP/TFTP protocol
4043diskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd'
4044loads - load S-Record file over serial line
4045loadb - load binary file over serial line (kermit mode)
4046md - memory display
4047mm - memory modify (auto-incrementing)
4048nm - memory modify (constant address)
4049mw - memory write (fill)
4050cp - memory copy
4051cmp - memory compare
4052crc32 - checksum calculation
Peter Tyser469cde42009-04-18 22:34:03 -05004053i2c - I2C sub-system
wdenk6c59edc2004-05-03 20:45:30 +00004054sspi - SPI utility commands
4055base - print or set address offset
4056printenv- print environment variables
4057setenv - set environment variables
4058saveenv - save environment variables to persistent storage
4059protect - enable or disable FLASH write protection
4060erase - erase FLASH memory
4061flinfo - print FLASH memory information
Karl O. Pinc4baf03d2012-08-03 05:57:21 +00004062nand - NAND memory operations (see doc/README.nand)
wdenk6c59edc2004-05-03 20:45:30 +00004063bdinfo - print Board Info structure
4064iminfo - print header information for application image
4065coninfo - print console devices and informations
4066ide - IDE sub-system
4067loop - infinite loop on address range
wdenk64519362004-07-11 17:40:54 +00004068loopw - infinite write loop on address range
wdenk6c59edc2004-05-03 20:45:30 +00004069mtest - simple RAM test
4070icache - enable or disable instruction cache
4071dcache - enable or disable data cache
4072reset - Perform RESET of the CPU
4073echo - echo args to console
4074version - print monitor version
4075help - print online help
4076? - alias for 'help'
wdenkc6097192002-11-03 00:24:07 +00004077
wdenkc6097192002-11-03 00:24:07 +00004078
wdenk6c59edc2004-05-03 20:45:30 +00004079Monitor Commands - Detailed Description:
4080========================================
wdenkc6097192002-11-03 00:24:07 +00004081
wdenk6c59edc2004-05-03 20:45:30 +00004082TODO.
wdenkc6097192002-11-03 00:24:07 +00004083
wdenk6c59edc2004-05-03 20:45:30 +00004084For now: just type "help <command>".
wdenkc6097192002-11-03 00:24:07 +00004085
4086
wdenk6c59edc2004-05-03 20:45:30 +00004087Environment Variables:
4088======================
wdenkc6097192002-11-03 00:24:07 +00004089
wdenk6c59edc2004-05-03 20:45:30 +00004090U-Boot supports user configuration using Environment Variables which
4091can be made persistent by saving to Flash memory.
wdenkc6097192002-11-03 00:24:07 +00004092
wdenk6c59edc2004-05-03 20:45:30 +00004093Environment Variables are set using "setenv", printed using
4094"printenv", and saved to Flash using "saveenv". Using "setenv"
4095without a value can be used to delete a variable from the
4096environment. As long as you don't save the environment you are
4097working with an in-memory copy. In case the Flash area containing the
4098environment is erased by accident, a default environment is provided.
wdenkc6097192002-11-03 00:24:07 +00004099
Wolfgang Denkb233bd72010-01-17 23:55:53 +01004100Some configuration options can be set using Environment Variables.
4101
4102List of environment variables (most likely not complete):
wdenkc6097192002-11-03 00:24:07 +00004103
wdenk6c59edc2004-05-03 20:45:30 +00004104 baudrate - see CONFIG_BAUDRATE
wdenkc6097192002-11-03 00:24:07 +00004105
wdenk6c59edc2004-05-03 20:45:30 +00004106 bootdelay - see CONFIG_BOOTDELAY
wdenkc6097192002-11-03 00:24:07 +00004107
wdenk6c59edc2004-05-03 20:45:30 +00004108 bootcmd - see CONFIG_BOOTCOMMAND
wdenkc6097192002-11-03 00:24:07 +00004109
wdenk6c59edc2004-05-03 20:45:30 +00004110 bootargs - Boot arguments when booting an RTOS image
wdenkc6097192002-11-03 00:24:07 +00004111
wdenk6c59edc2004-05-03 20:45:30 +00004112 bootfile - Name of the image to load with TFTP
wdenkc6097192002-11-03 00:24:07 +00004113
Bartlomiej Siekac5648c82008-04-14 15:44:16 +02004114 bootm_low - Memory range available for image processing in the bootm
4115 command can be restricted. This variable is given as
4116 a hexadecimal number and defines lowest address allowed
4117 for use by the bootm command. See also "bootm_size"
4118 environment variable. Address defined by "bootm_low" is
4119 also the base of the initial memory mapping for the Linux
Grant Likely26396382011-03-28 09:58:43 +00004120 kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and
4121 bootm_mapsize.
4122
Wolfgang Denk092ae952011-10-26 10:21:21 +00004123 bootm_mapsize - Size of the initial memory mapping for the Linux kernel.
Grant Likely26396382011-03-28 09:58:43 +00004124 This variable is given as a hexadecimal number and it
4125 defines the size of the memory region starting at base
4126 address bootm_low that is accessible by the Linux kernel
4127 during early boot. If unset, CONFIG_SYS_BOOTMAPSZ is used
4128 as the default value if it is defined, and bootm_size is
4129 used otherwise.
Bartlomiej Siekac5648c82008-04-14 15:44:16 +02004130
4131 bootm_size - Memory range available for image processing in the bootm
4132 command can be restricted. This variable is given as
4133 a hexadecimal number and defines the size of the region
4134 allowed for use by the bootm command. See also "bootm_low"
4135 environment variable.
4136
Bartlomiej Siekae273e9f2008-10-01 15:26:31 +02004137 updatefile - Location of the software update file on a TFTP server, used
4138 by the automatic software update feature. Please refer to
4139 documentation in doc/README.update for more details.
4140
wdenk6c59edc2004-05-03 20:45:30 +00004141 autoload - if set to "no" (any string beginning with 'n'),
4142 "bootp" will just load perform a lookup of the
4143 configuration from the BOOTP server, but not try to
4144 load any image using TFTP
wdenkc6097192002-11-03 00:24:07 +00004145
wdenk6c59edc2004-05-03 20:45:30 +00004146 autostart - if set to "yes", an image loaded using the "bootp",
4147 "rarpboot", "tftpboot" or "diskboot" commands will
4148 be automatically started (by internally calling
4149 "bootm")
wdenkc6097192002-11-03 00:24:07 +00004150
wdenk6c59edc2004-05-03 20:45:30 +00004151 If set to "no", a standalone image passed to the
4152 "bootm" command will be copied to the load address
4153 (and eventually uncompressed), but NOT be started.
4154 This can be used to load and uncompress arbitrary
4155 data.
wdenkc6097192002-11-03 00:24:07 +00004156
David A. Longd558a4e2011-07-09 16:40:19 -04004157 fdt_high - if set this restricts the maximum address that the
4158 flattened device tree will be copied into upon boot.
Shawn Guo0ca9e982012-01-09 21:54:08 +00004159 For example, if you have a system with 1 GB memory
4160 at physical address 0x10000000, while Linux kernel
4161 only recognizes the first 704 MB as low memory, you
4162 may need to set fdt_high as 0x3C000000 to have the
4163 device tree blob be copied to the maximum address
4164 of the 704 MB low memory, so that Linux kernel can
4165 access it during the boot procedure.
4166
David A. Longd558a4e2011-07-09 16:40:19 -04004167 If this is set to the special value 0xFFFFFFFF then
4168 the fdt will not be copied at all on boot. For this
4169 to work it must reside in writable memory, have
4170 sufficient padding on the end of it for u-boot to
4171 add the information it needs into it, and the memory
4172 must be accessible by the kernel.
4173
Simon Glassdc6fa642011-10-24 19:15:34 +00004174 fdtcontroladdr- if set this is the address of the control flattened
4175 device tree used by U-Boot when CONFIG_OF_CONTROL is
4176 defined.
4177
wdenk0e2bd9c2004-06-06 21:51:03 +00004178 i2cfast - (PPC405GP|PPC405EP only)
4179 if set to 'y' configures Linux I2C driver for fast
4180 mode (400kHZ). This environment variable is used in
4181 initialization code. So, for changes to be effective
4182 it must be saved and board must be reset.
4183
wdenk6c59edc2004-05-03 20:45:30 +00004184 initrd_high - restrict positioning of initrd images:
4185 If this variable is not set, initrd images will be
4186 copied to the highest possible address in RAM; this
4187 is usually what you want since it allows for
4188 maximum initrd size. If for some reason you want to
4189 make sure that the initrd image is loaded below the
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02004190 CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
wdenk6c59edc2004-05-03 20:45:30 +00004191 variable to a value of "no" or "off" or "0".
4192 Alternatively, you can set it to a maximum upper
4193 address to use (U-Boot will still check that it
4194 does not overwrite the U-Boot stack and data).
wdenkc6097192002-11-03 00:24:07 +00004195
wdenk6c59edc2004-05-03 20:45:30 +00004196 For instance, when you have a system with 16 MB
4197 RAM, and want to reserve 4 MB from use by Linux,
4198 you can do this by adding "mem=12M" to the value of
4199 the "bootargs" variable. However, now you must make
4200 sure that the initrd image is placed in the first
4201 12 MB as well - this can be done with
wdenkc6097192002-11-03 00:24:07 +00004202
wdenk6c59edc2004-05-03 20:45:30 +00004203 setenv initrd_high 00c00000
wdenkc6097192002-11-03 00:24:07 +00004204
wdenk6c59edc2004-05-03 20:45:30 +00004205 If you set initrd_high to 0xFFFFFFFF, this is an
4206 indication to U-Boot that all addresses are legal
4207 for the Linux kernel, including addresses in flash
4208 memory. In this case U-Boot will NOT COPY the
4209 ramdisk at all. This may be useful to reduce the
4210 boot time on your system, but requires that this
4211 feature is supported by your Linux kernel.
wdenk3f9ab982003-04-12 23:38:12 +00004212
wdenk6c59edc2004-05-03 20:45:30 +00004213 ipaddr - IP address; needed for tftpboot command
wdenkc6097192002-11-03 00:24:07 +00004214
wdenk6c59edc2004-05-03 20:45:30 +00004215 loadaddr - Default load address for commands like "bootp",
4216 "rarpboot", "tftpboot", "loadb" or "diskboot"
wdenkc6097192002-11-03 00:24:07 +00004217
wdenk6c59edc2004-05-03 20:45:30 +00004218 loads_echo - see CONFIG_LOADS_ECHO
wdenkc6097192002-11-03 00:24:07 +00004219
wdenk6c59edc2004-05-03 20:45:30 +00004220 serverip - TFTP server IP address; needed for tftpboot command
wdenk6f770ed2003-05-23 23:18:21 +00004221
wdenk6c59edc2004-05-03 20:45:30 +00004222 bootretry - see CONFIG_BOOT_RETRY_TIME
wdenkc6097192002-11-03 00:24:07 +00004223
wdenk6c59edc2004-05-03 20:45:30 +00004224 bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR
wdenkc6097192002-11-03 00:24:07 +00004225
wdenk6c59edc2004-05-03 20:45:30 +00004226 bootstopkey - see CONFIG_AUTOBOOT_STOP_STR
wdenkc6097192002-11-03 00:24:07 +00004227
Mike Frysingera23230c2011-10-02 10:01:27 +00004228 ethprime - controls which interface is used first.
wdenkc6097192002-11-03 00:24:07 +00004229
Mike Frysingera23230c2011-10-02 10:01:27 +00004230 ethact - controls which interface is currently active.
4231 For example you can do the following
wdenkc6097192002-11-03 00:24:07 +00004232
Heiko Schocherc5e84052010-07-20 17:45:02 +02004233 => setenv ethact FEC
4234 => ping 192.168.0.1 # traffic sent on FEC
4235 => setenv ethact SCC
4236 => ping 10.0.0.1 # traffic sent on SCC
wdenkc6097192002-11-03 00:24:07 +00004237
Matthias Fuchs204f0ec2008-01-17 07:45:05 +01004238 ethrotate - When set to "no" U-Boot does not go through all
4239 available network interfaces.
4240 It just stays at the currently selected interface.
4241
Wolfgang Denkb233bd72010-01-17 23:55:53 +01004242 netretry - When set to "no" each network operation will
wdenk6c59edc2004-05-03 20:45:30 +00004243 either succeed or fail without retrying.
4244 When set to "once" the network operation will
4245 fail when all the available network interfaces
4246 are tried once without success.
4247 Useful on scripts which control the retry operation
4248 themselves.
wdenkc6097192002-11-03 00:24:07 +00004249
Jean-Christophe PLAGNIOL-VILLARD1948d6c2009-01-31 09:53:39 +01004250 npe_ucode - set load address for the NPE microcode
Jean-Christophe PLAGNIOL-VILLARDd2164ef2008-01-07 08:41:34 +01004251
Wolfgang Denk227b5192005-09-24 23:25:46 +02004252 tftpsrcport - If this is set, the value is used for TFTP's
Wolfgang Denke3cfce52005-09-24 22:37:32 +02004253 UDP source port.
4254
Wolfgang Denk227b5192005-09-24 23:25:46 +02004255 tftpdstport - If this is set, the value is used for TFTP's UDP
4256 destination port instead of the Well Know Port 69.
4257
Wolfgang Denkb233bd72010-01-17 23:55:53 +01004258 tftpblocksize - Block size to use for TFTP transfers; if not set,
4259 we use the TFTP server's default block size
4260
4261 tftptimeout - Retransmission timeout for TFTP packets (in milli-
4262 seconds, minimum value is 1000 = 1 second). Defines
4263 when a packet is considered to be lost so it has to
4264 be retransmitted. The default is 5000 = 5 seconds.
4265 Lowering this value may make downloads succeed
4266 faster in networks with high packet loss rates or
4267 with unreliable TFTP servers.
4268
4269 vlan - When set to a value < 4095 the traffic over
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02004270 Ethernet is encapsulated/received over 802.1q
wdenk6c59edc2004-05-03 20:45:30 +00004271 VLAN tagged frames.
wdenk145d2c12004-04-15 21:48:45 +00004272
Jason Hobbse3fe08e2011-08-31 05:37:28 +00004273The following image location variables contain the location of images
4274used in booting. The "Image" column gives the role of the image and is
4275not an environment variable name. The other columns are environment
4276variable names. "File Name" gives the name of the file on a TFTP
4277server, "RAM Address" gives the location in RAM the image will be
4278loaded to, and "Flash Location" gives the image's address in NOR
4279flash or offset in NAND flash.
4280
4281*Note* - these variables don't have to be defined for all boards, some
4282boards currenlty use other variables for these purposes, and some
4283boards use these variables for other purposes.
4284
Wolfgang Denk092ae952011-10-26 10:21:21 +00004285Image File Name RAM Address Flash Location
4286----- --------- ----------- --------------
4287u-boot u-boot u-boot_addr_r u-boot_addr
4288Linux kernel bootfile kernel_addr_r kernel_addr
4289device tree blob fdtfile fdt_addr_r fdt_addr
4290ramdisk ramdiskfile ramdisk_addr_r ramdisk_addr
Jason Hobbse3fe08e2011-08-31 05:37:28 +00004291
wdenk6c59edc2004-05-03 20:45:30 +00004292The following environment variables may be used and automatically
4293updated by the network boot commands ("bootp" and "rarpboot"),
4294depending the information provided by your boot server:
wdenk145d2c12004-04-15 21:48:45 +00004295
wdenk6c59edc2004-05-03 20:45:30 +00004296 bootfile - see above
4297 dnsip - IP address of your Domain Name Server
4298 dnsip2 - IP address of your secondary Domain Name Server
4299 gatewayip - IP address of the Gateway (Router) to use
4300 hostname - Target hostname
4301 ipaddr - see above
4302 netmask - Subnet Mask
4303 rootpath - Pathname of the root filesystem on the NFS server
4304 serverip - see above
wdenk145d2c12004-04-15 21:48:45 +00004305
wdenk145d2c12004-04-15 21:48:45 +00004306
wdenk6c59edc2004-05-03 20:45:30 +00004307There are two special Environment Variables:
wdenkc6097192002-11-03 00:24:07 +00004308
wdenk6c59edc2004-05-03 20:45:30 +00004309 serial# - contains hardware identification information such
4310 as type string and/or serial number
4311 ethaddr - Ethernet address
wdenkc6097192002-11-03 00:24:07 +00004312
wdenk6c59edc2004-05-03 20:45:30 +00004313These variables can be set only once (usually during manufacturing of
4314the board). U-Boot refuses to delete or overwrite these variables
4315once they have been set once.
wdenkc6097192002-11-03 00:24:07 +00004316
4317
wdenk6c59edc2004-05-03 20:45:30 +00004318Further special Environment Variables:
wdenkc6097192002-11-03 00:24:07 +00004319
wdenk6c59edc2004-05-03 20:45:30 +00004320 ver - Contains the U-Boot version string as printed
4321 with the "version" command. This variable is
4322 readonly (see CONFIG_VERSION_VARIABLE).
wdenkc6097192002-11-03 00:24:07 +00004323
wdenkc6097192002-11-03 00:24:07 +00004324
wdenk6c59edc2004-05-03 20:45:30 +00004325Please note that changes to some configuration parameters may take
4326only effect after the next boot (yes, that's just like Windoze :-).
stroeseb9c17c52003-04-04 15:53:41 +00004327
stroeseb9c17c52003-04-04 15:53:41 +00004328
Joe Hershberger60fd3ad2012-12-11 22:16:24 -06004329Callback functions for environment variables:
4330---------------------------------------------
4331
4332For some environment variables, the behavior of u-boot needs to change
4333when their values are changed. This functionailty allows functions to
4334be associated with arbitrary variables. On creation, overwrite, or
4335deletion, the callback will provide the opportunity for some side
4336effect to happen or for the change to be rejected.
4337
4338The callbacks are named and associated with a function using the
4339U_BOOT_ENV_CALLBACK macro in your board or driver code.
4340
4341These callbacks are associated with variables in one of two ways. The
4342static list can be added to by defining CONFIG_ENV_CALLBACK_LIST_STATIC
4343in the board configuration to a string that defines a list of
4344associations. The list must be in the following format:
4345
4346 entry = variable_name[:callback_name]
4347 list = entry[,list]
4348
4349If the callback name is not specified, then the callback is deleted.
4350Spaces are also allowed anywhere in the list.
4351
4352Callbacks can also be associated by defining the ".callbacks" variable
4353with the same list format above. Any association in ".callbacks" will
4354override any association in the static list. You can define
4355CONFIG_ENV_CALLBACK_LIST_DEFAULT to a list (string) to define the
4356".callbacks" envirnoment variable in the default or embedded environment.
4357
4358
wdenk6c59edc2004-05-03 20:45:30 +00004359Command Line Parsing:
4360=====================
stroeseb9c17c52003-04-04 15:53:41 +00004361
wdenk6c59edc2004-05-03 20:45:30 +00004362There are two different command line parsers available with U-Boot:
4363the old "simple" one, and the much more powerful "hush" shell:
wdenkc6097192002-11-03 00:24:07 +00004364
wdenk6c59edc2004-05-03 20:45:30 +00004365Old, simple command line parser:
4366--------------------------------
wdenkc6097192002-11-03 00:24:07 +00004367
wdenk6c59edc2004-05-03 20:45:30 +00004368- supports environment variables (through setenv / saveenv commands)
4369- several commands on one line, separated by ';'
Wolfgang Denk86eb3b72005-11-20 21:40:11 +01004370- variable substitution using "... ${name} ..." syntax
wdenk6c59edc2004-05-03 20:45:30 +00004371- special characters ('$', ';') can be escaped by prefixing with '\',
4372 for example:
Wolfgang Denk86eb3b72005-11-20 21:40:11 +01004373 setenv bootcmd bootm \${address}
wdenk6c59edc2004-05-03 20:45:30 +00004374- You can also escape text by enclosing in single apostrophes, for example:
4375 setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
wdenkc6097192002-11-03 00:24:07 +00004376
wdenk6c59edc2004-05-03 20:45:30 +00004377Hush shell:
4378-----------
wdenkf4688a22003-05-28 08:06:31 +00004379
wdenk6c59edc2004-05-03 20:45:30 +00004380- similar to Bourne shell, with control structures like
4381 if...then...else...fi, for...do...done; while...do...done,
4382 until...do...done, ...
4383- supports environment ("global") variables (through setenv / saveenv
4384 commands) and local shell variables (through standard shell syntax
4385 "name=value"); only environment variables can be used with "run"
4386 command
wdenkf4688a22003-05-28 08:06:31 +00004387
wdenk6c59edc2004-05-03 20:45:30 +00004388General rules:
4389--------------
wdenkf4688a22003-05-28 08:06:31 +00004390
wdenk6c59edc2004-05-03 20:45:30 +00004391(1) If a command line (or an environment variable executed by a "run"
4392 command) contains several commands separated by semicolon, and
4393 one of these commands fails, then the remaining commands will be
4394 executed anyway.
wdenkf4688a22003-05-28 08:06:31 +00004395
wdenk6c59edc2004-05-03 20:45:30 +00004396(2) If you execute several variables with one call to run (i. e.
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02004397 calling run with a list of variables as arguments), any failing
wdenk6c59edc2004-05-03 20:45:30 +00004398 command will cause "run" to terminate, i. e. the remaining
4399 variables are not executed.
wdenkf4688a22003-05-28 08:06:31 +00004400
wdenk6c59edc2004-05-03 20:45:30 +00004401Note for Redundant Ethernet Interfaces:
4402=======================================
wdenkf4688a22003-05-28 08:06:31 +00004403
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02004404Some boards come with redundant Ethernet interfaces; U-Boot supports
wdenk6c59edc2004-05-03 20:45:30 +00004405such configurations and is capable of automatic selection of a
4406"working" interface when needed. MAC assignment works as follows:
wdenkf4688a22003-05-28 08:06:31 +00004407
wdenk6c59edc2004-05-03 20:45:30 +00004408Network interfaces are numbered eth0, eth1, eth2, ... Corresponding
4409MAC addresses can be stored in the environment as "ethaddr" (=>eth0),
4410"eth1addr" (=>eth1), "eth2addr", ...
wdenkf4688a22003-05-28 08:06:31 +00004411
wdenk6c59edc2004-05-03 20:45:30 +00004412If the network interface stores some valid MAC address (for instance
4413in SROM), this is used as default address if there is NO correspon-
4414ding setting in the environment; if the corresponding environment
4415variable is set, this overrides the settings in the card; that means:
wdenkf4688a22003-05-28 08:06:31 +00004416
wdenk6c59edc2004-05-03 20:45:30 +00004417o If the SROM has a valid MAC address, and there is no address in the
4418 environment, the SROM's address is used.
wdenkc6097192002-11-03 00:24:07 +00004419
wdenk6c59edc2004-05-03 20:45:30 +00004420o If there is no valid address in the SROM, and a definition in the
4421 environment exists, then the value from the environment variable is
4422 used.
wdenkc6097192002-11-03 00:24:07 +00004423
wdenk6c59edc2004-05-03 20:45:30 +00004424o If both the SROM and the environment contain a MAC address, and
4425 both addresses are the same, this MAC address is used.
wdenkc6097192002-11-03 00:24:07 +00004426
wdenk6c59edc2004-05-03 20:45:30 +00004427o If both the SROM and the environment contain a MAC address, and the
4428 addresses differ, the value from the environment is used and a
4429 warning is printed.
wdenkc6097192002-11-03 00:24:07 +00004430
wdenk6c59edc2004-05-03 20:45:30 +00004431o If neither SROM nor the environment contain a MAC address, an error
4432 is raised.
wdenkc6097192002-11-03 00:24:07 +00004433
Ben Warren6db991a2010-04-26 11:11:46 -07004434If Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses
Wolfgang Denk092ae952011-10-26 10:21:21 +00004435will be programmed into hardware as part of the initialization process. This
Ben Warren6db991a2010-04-26 11:11:46 -07004436may be skipped by setting the appropriate 'ethmacskip' environment variable.
4437The naming convention is as follows:
4438"ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc.
wdenkc6097192002-11-03 00:24:07 +00004439
wdenk6c59edc2004-05-03 20:45:30 +00004440Image Formats:
4441==============
wdenkc6097192002-11-03 00:24:07 +00004442
Marian Balakowicz18710b82008-03-12 12:13:13 +01004443U-Boot is capable of booting (and performing other auxiliary operations on)
4444images in two formats:
4445
4446New uImage format (FIT)
4447-----------------------
4448
4449Flexible and powerful format based on Flattened Image Tree -- FIT (similar
4450to Flattened Device Tree). It allows the use of images with multiple
4451components (several kernels, ramdisks, etc.), with contents protected by
4452SHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
4453
4454
4455Old uImage format
4456-----------------
4457
4458Old image format is based on binary files which can be basically anything,
4459preceded by a special header; see the definitions in include/image.h for
4460details; basically, the header defines the following image properties:
wdenkc6097192002-11-03 00:24:07 +00004461
wdenk6c59edc2004-05-03 20:45:30 +00004462* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
4463 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
Peter Tyser56b8dd12008-09-08 14:56:49 -05004464 LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
4465 Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
4466 INTEGRITY).
Wolfgang Denk83c15852006-10-24 14:21:16 +02004467* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
Macpaul Lin1cac36e2011-10-19 20:41:11 +00004468 IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
4469 Currently supported: ARM, AVR32, Intel x86, MIPS, NDS32, Nios II, PowerPC).
wdenk6c59edc2004-05-03 20:45:30 +00004470* Compression Type (uncompressed, gzip, bzip2)
4471* Load Address
4472* Entry Point
4473* Image Name
4474* Image Timestamp
wdenkc6097192002-11-03 00:24:07 +00004475
wdenk6c59edc2004-05-03 20:45:30 +00004476The header is marked by a special Magic Number, and both the header
4477and the data portions of the image are secured against corruption by
4478CRC32 checksums.
wdenkc6097192002-11-03 00:24:07 +00004479
wdenkc6097192002-11-03 00:24:07 +00004480
wdenk6c59edc2004-05-03 20:45:30 +00004481Linux Support:
4482==============
wdenkc6097192002-11-03 00:24:07 +00004483
wdenk6c59edc2004-05-03 20:45:30 +00004484Although U-Boot should support any OS or standalone application
4485easily, the main focus has always been on Linux during the design of
4486U-Boot.
wdenkc6097192002-11-03 00:24:07 +00004487
wdenk6c59edc2004-05-03 20:45:30 +00004488U-Boot includes many features that so far have been part of some
4489special "boot loader" code within the Linux kernel. Also, any
4490"initrd" images to be used are no longer part of one big Linux image;
4491instead, kernel and "initrd" are separate images. This implementation
4492serves several purposes:
wdenkc6097192002-11-03 00:24:07 +00004493
wdenk6c59edc2004-05-03 20:45:30 +00004494- the same features can be used for other OS or standalone
4495 applications (for instance: using compressed images to reduce the
4496 Flash memory footprint)
wdenkc6097192002-11-03 00:24:07 +00004497
wdenk6c59edc2004-05-03 20:45:30 +00004498- it becomes much easier to port new Linux kernel versions because
4499 lots of low-level, hardware dependent stuff are done by U-Boot
wdenkc6097192002-11-03 00:24:07 +00004500
wdenk6c59edc2004-05-03 20:45:30 +00004501- the same Linux kernel image can now be used with different "initrd"
4502 images; of course this also means that different kernel images can
4503 be run with the same "initrd". This makes testing easier (you don't
4504 have to build a new "zImage.initrd" Linux image when you just
4505 change a file in your "initrd"). Also, a field-upgrade of the
4506 software is easier now.
wdenkc6097192002-11-03 00:24:07 +00004507
wdenkc6097192002-11-03 00:24:07 +00004508
wdenk6c59edc2004-05-03 20:45:30 +00004509Linux HOWTO:
4510============
wdenkc6097192002-11-03 00:24:07 +00004511
wdenk6c59edc2004-05-03 20:45:30 +00004512Porting Linux to U-Boot based systems:
4513---------------------------------------
wdenkc6097192002-11-03 00:24:07 +00004514
wdenk6c59edc2004-05-03 20:45:30 +00004515U-Boot cannot save you from doing all the necessary modifications to
4516configure the Linux device drivers for use with your target hardware
4517(no, we don't intend to provide a full virtual machine interface to
4518Linux :-).
wdenkc6097192002-11-03 00:24:07 +00004519
Stefan Roese88fbf932010-04-15 16:07:28 +02004520But now you can ignore ALL boot loader code (in arch/powerpc/mbxboot).
wdenkc6097192002-11-03 00:24:07 +00004521
wdenk6c59edc2004-05-03 20:45:30 +00004522Just make sure your machine specific header file (for instance
4523include/asm-ppc/tqm8xx.h) includes the same definition of the Board
Markus Heidelberg47167572008-09-07 20:18:27 +02004524Information structure as we define in include/asm-<arch>/u-boot.h,
4525and make sure that your definition of IMAP_ADDR uses the same value
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02004526as your U-Boot configuration in CONFIG_SYS_IMMR.
wdenkc6097192002-11-03 00:24:07 +00004527
wdenkc6097192002-11-03 00:24:07 +00004528
wdenk6c59edc2004-05-03 20:45:30 +00004529Configuring the Linux kernel:
4530-----------------------------
wdenkc6097192002-11-03 00:24:07 +00004531
wdenk6c59edc2004-05-03 20:45:30 +00004532No specific requirements for U-Boot. Make sure you have some root
4533device (initial ramdisk, NFS) for your target system.
wdenkc6097192002-11-03 00:24:07 +00004534
wdenkc6097192002-11-03 00:24:07 +00004535
wdenk6c59edc2004-05-03 20:45:30 +00004536Building a Linux Image:
4537-----------------------
wdenkc6097192002-11-03 00:24:07 +00004538
wdenk6c59edc2004-05-03 20:45:30 +00004539With U-Boot, "normal" build targets like "zImage" or "bzImage" are
4540not used. If you use recent kernel source, a new build target
4541"uImage" will exist which automatically builds an image usable by
4542U-Boot. Most older kernels also have support for a "pImage" target,
4543which was introduced for our predecessor project PPCBoot and uses a
4544100% compatible format.
wdenkc6097192002-11-03 00:24:07 +00004545
wdenk6c59edc2004-05-03 20:45:30 +00004546Example:
wdenkc6097192002-11-03 00:24:07 +00004547
wdenk6c59edc2004-05-03 20:45:30 +00004548 make TQM850L_config
4549 make oldconfig
4550 make dep
4551 make uImage
wdenkc6097192002-11-03 00:24:07 +00004552
wdenk6c59edc2004-05-03 20:45:30 +00004553The "uImage" build target uses a special tool (in 'tools/mkimage') to
4554encapsulate a compressed Linux kernel image with header information,
4555CRC32 checksum etc. for use with U-Boot. This is what we are doing:
wdenkc6097192002-11-03 00:24:07 +00004556
wdenk6c59edc2004-05-03 20:45:30 +00004557* build a standard "vmlinux" kernel image (in ELF binary format):
wdenkc6097192002-11-03 00:24:07 +00004558
wdenk6c59edc2004-05-03 20:45:30 +00004559* convert the kernel into a raw binary image:
wdenkc6097192002-11-03 00:24:07 +00004560
wdenk6c59edc2004-05-03 20:45:30 +00004561 ${CROSS_COMPILE}-objcopy -O binary \
4562 -R .note -R .comment \
4563 -S vmlinux linux.bin
wdenk24ee89b2002-11-03 17:56:27 +00004564
wdenk6c59edc2004-05-03 20:45:30 +00004565* compress the binary image:
wdenk24ee89b2002-11-03 17:56:27 +00004566
wdenk6c59edc2004-05-03 20:45:30 +00004567 gzip -9 linux.bin
wdenk24ee89b2002-11-03 17:56:27 +00004568
wdenk6c59edc2004-05-03 20:45:30 +00004569* package compressed binary image for U-Boot:
wdenk24ee89b2002-11-03 17:56:27 +00004570
wdenk6c59edc2004-05-03 20:45:30 +00004571 mkimage -A ppc -O linux -T kernel -C gzip \
4572 -a 0 -e 0 -n "Linux Kernel Image" \
4573 -d linux.bin.gz uImage
wdenkc6097192002-11-03 00:24:07 +00004574
wdenkc6097192002-11-03 00:24:07 +00004575
wdenk6c59edc2004-05-03 20:45:30 +00004576The "mkimage" tool can also be used to create ramdisk images for use
4577with U-Boot, either separated from the Linux kernel image, or
4578combined into one file. "mkimage" encapsulates the images with a 64
4579byte header containing information about target architecture,
4580operating system, image type, compression method, entry points, time
4581stamp, CRC32 checksums, etc.
wdenkc6097192002-11-03 00:24:07 +00004582
wdenk6c59edc2004-05-03 20:45:30 +00004583"mkimage" can be called in two ways: to verify existing images and
4584print the header information, or to build new images.
wdenk24ee89b2002-11-03 17:56:27 +00004585
wdenk6c59edc2004-05-03 20:45:30 +00004586In the first form (with "-l" option) mkimage lists the information
4587contained in the header of an existing U-Boot image; this includes
4588checksum verification:
wdenk24ee89b2002-11-03 17:56:27 +00004589
wdenk6c59edc2004-05-03 20:45:30 +00004590 tools/mkimage -l image
4591 -l ==> list image header information
wdenk24ee89b2002-11-03 17:56:27 +00004592
wdenk6c59edc2004-05-03 20:45:30 +00004593The second form (with "-d" option) is used to build a U-Boot image
4594from a "data file" which is used as image payload:
wdenk24ee89b2002-11-03 17:56:27 +00004595
wdenk6c59edc2004-05-03 20:45:30 +00004596 tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
4597 -n name -d data_file image
4598 -A ==> set architecture to 'arch'
4599 -O ==> set operating system to 'os'
4600 -T ==> set image type to 'type'
4601 -C ==> set compression type 'comp'
4602 -a ==> set load address to 'addr' (hex)
4603 -e ==> set entry point to 'ep' (hex)
4604 -n ==> set image name to 'name'
4605 -d ==> use image data from 'datafile'
wdenk24ee89b2002-11-03 17:56:27 +00004606
wdenkcd914452004-05-29 16:53:29 +00004607Right now, all Linux kernels for PowerPC systems use the same load
4608address (0x00000000), but the entry point address depends on the
4609kernel version:
wdenkc6097192002-11-03 00:24:07 +00004610
wdenk6c59edc2004-05-03 20:45:30 +00004611- 2.2.x kernels have the entry point at 0x0000000C,
4612- 2.3.x and later kernels have the entry point at 0x00000000.
wdenkc6097192002-11-03 00:24:07 +00004613
wdenk6c59edc2004-05-03 20:45:30 +00004614So a typical call to build a U-Boot image would read:
wdenkc6097192002-11-03 00:24:07 +00004615
wdenk6c59edc2004-05-03 20:45:30 +00004616 -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
4617 > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
Stefan Roese88fbf932010-04-15 16:07:28 +02004618 > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \
wdenk6c59edc2004-05-03 20:45:30 +00004619 > examples/uImage.TQM850L
4620 Image Name: 2.4.4 kernel for TQM850L
4621 Created: Wed Jul 19 02:34:59 2000
4622 Image Type: PowerPC Linux Kernel Image (gzip compressed)
4623 Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
4624 Load Address: 0x00000000
4625 Entry Point: 0x00000000
wdenkc6097192002-11-03 00:24:07 +00004626
wdenk6c59edc2004-05-03 20:45:30 +00004627To verify the contents of the image (or check for corruption):
wdenkc6097192002-11-03 00:24:07 +00004628
wdenk6c59edc2004-05-03 20:45:30 +00004629 -> tools/mkimage -l examples/uImage.TQM850L
4630 Image Name: 2.4.4 kernel for TQM850L
4631 Created: Wed Jul 19 02:34:59 2000
4632 Image Type: PowerPC Linux Kernel Image (gzip compressed)
4633 Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
4634 Load Address: 0x00000000
4635 Entry Point: 0x00000000
wdenkc6097192002-11-03 00:24:07 +00004636
wdenk6c59edc2004-05-03 20:45:30 +00004637NOTE: for embedded systems where boot time is critical you can trade
4638speed for memory and install an UNCOMPRESSED image instead: this
4639needs more space in Flash, but boots much faster since it does not
4640need to be uncompressed:
wdenkc6097192002-11-03 00:24:07 +00004641
Stefan Roese88fbf932010-04-15 16:07:28 +02004642 -> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz
wdenk6c59edc2004-05-03 20:45:30 +00004643 -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
4644 > -A ppc -O linux -T kernel -C none -a 0 -e 0 \
Stefan Roese88fbf932010-04-15 16:07:28 +02004645 > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \
wdenk6c59edc2004-05-03 20:45:30 +00004646 > examples/uImage.TQM850L-uncompressed
4647 Image Name: 2.4.4 kernel for TQM850L
4648 Created: Wed Jul 19 02:34:59 2000
4649 Image Type: PowerPC Linux Kernel Image (uncompressed)
4650 Data Size: 792160 Bytes = 773.59 kB = 0.76 MB
4651 Load Address: 0x00000000
4652 Entry Point: 0x00000000
wdenkc6097192002-11-03 00:24:07 +00004653
wdenkc6097192002-11-03 00:24:07 +00004654
wdenk6c59edc2004-05-03 20:45:30 +00004655Similar you can build U-Boot images from a 'ramdisk.image.gz' file
4656when your kernel is intended to use an initial ramdisk:
wdenkc6097192002-11-03 00:24:07 +00004657
wdenk6c59edc2004-05-03 20:45:30 +00004658 -> tools/mkimage -n 'Simple Ramdisk Image' \
4659 > -A ppc -O linux -T ramdisk -C gzip \
4660 > -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
4661 Image Name: Simple Ramdisk Image
4662 Created: Wed Jan 12 14:01:50 2000
4663 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
4664 Data Size: 566530 Bytes = 553.25 kB = 0.54 MB
4665 Load Address: 0x00000000
4666 Entry Point: 0x00000000
wdenkc6097192002-11-03 00:24:07 +00004667
wdenkc6097192002-11-03 00:24:07 +00004668
wdenk6c59edc2004-05-03 20:45:30 +00004669Installing a Linux Image:
4670-------------------------
wdenkc6097192002-11-03 00:24:07 +00004671
wdenk6c59edc2004-05-03 20:45:30 +00004672To downloading a U-Boot image over the serial (console) interface,
4673you must convert the image to S-Record format:
wdenkc6097192002-11-03 00:24:07 +00004674
wdenk6c59edc2004-05-03 20:45:30 +00004675 objcopy -I binary -O srec examples/image examples/image.srec
wdenkc6097192002-11-03 00:24:07 +00004676
wdenk6c59edc2004-05-03 20:45:30 +00004677The 'objcopy' does not understand the information in the U-Boot
4678image header, so the resulting S-Record file will be relative to
4679address 0x00000000. To load it to a given address, you need to
4680specify the target address as 'offset' parameter with the 'loads'
4681command.
wdenkc6097192002-11-03 00:24:07 +00004682
wdenk6c59edc2004-05-03 20:45:30 +00004683Example: install the image to address 0x40100000 (which on the
4684TQM8xxL is in the first Flash bank):
wdenkc6097192002-11-03 00:24:07 +00004685
wdenk6c59edc2004-05-03 20:45:30 +00004686 => erase 40100000 401FFFFF
wdenkc6097192002-11-03 00:24:07 +00004687
wdenk6c59edc2004-05-03 20:45:30 +00004688 .......... done
4689 Erased 8 sectors
wdenkc6097192002-11-03 00:24:07 +00004690
wdenk6c59edc2004-05-03 20:45:30 +00004691 => loads 40100000
4692 ## Ready for S-Record download ...
4693 ~>examples/image.srec
4694 1 2 3 4 5 6 7 8 9 10 11 12 13 ...
4695 ...
4696 15989 15990 15991 15992
4697 [file transfer complete]
4698 [connected]
4699 ## Start Addr = 0x00000000
wdenkc6097192002-11-03 00:24:07 +00004700
wdenkc6097192002-11-03 00:24:07 +00004701
wdenk6c59edc2004-05-03 20:45:30 +00004702You can check the success of the download using the 'iminfo' command;
Wolfgang Denkb240aef2008-03-26 10:40:12 +01004703this includes a checksum verification so you can be sure no data
wdenk6c59edc2004-05-03 20:45:30 +00004704corruption happened:
wdenkc6097192002-11-03 00:24:07 +00004705
wdenk6c59edc2004-05-03 20:45:30 +00004706 => imi 40100000
wdenkc6097192002-11-03 00:24:07 +00004707
wdenk6c59edc2004-05-03 20:45:30 +00004708 ## Checking Image at 40100000 ...
4709 Image Name: 2.2.13 for initrd on TQM850L
4710 Image Type: PowerPC Linux Kernel Image (gzip compressed)
4711 Data Size: 335725 Bytes = 327 kB = 0 MB
4712 Load Address: 00000000
4713 Entry Point: 0000000c
4714 Verifying Checksum ... OK
wdenkc6097192002-11-03 00:24:07 +00004715
4716
wdenk6c59edc2004-05-03 20:45:30 +00004717Boot Linux:
4718-----------
wdenkc6097192002-11-03 00:24:07 +00004719
wdenk6c59edc2004-05-03 20:45:30 +00004720The "bootm" command is used to boot an application that is stored in
4721memory (RAM or Flash). In case of a Linux kernel image, the contents
4722of the "bootargs" environment variable is passed to the kernel as
4723parameters. You can check and modify this variable using the
4724"printenv" and "setenv" commands:
wdenkc6097192002-11-03 00:24:07 +00004725
wdenkc6097192002-11-03 00:24:07 +00004726
wdenk6c59edc2004-05-03 20:45:30 +00004727 => printenv bootargs
4728 bootargs=root=/dev/ram
wdenkc6097192002-11-03 00:24:07 +00004729
wdenk6c59edc2004-05-03 20:45:30 +00004730 => setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
wdenkc6097192002-11-03 00:24:07 +00004731
wdenk6c59edc2004-05-03 20:45:30 +00004732 => printenv bootargs
4733 bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
wdenkc6097192002-11-03 00:24:07 +00004734
wdenk6c59edc2004-05-03 20:45:30 +00004735 => bootm 40020000
4736 ## Booting Linux kernel at 40020000 ...
4737 Image Name: 2.2.13 for NFS on TQM850L
4738 Image Type: PowerPC Linux Kernel Image (gzip compressed)
4739 Data Size: 381681 Bytes = 372 kB = 0 MB
4740 Load Address: 00000000
4741 Entry Point: 0000000c
4742 Verifying Checksum ... OK
4743 Uncompressing Kernel Image ... OK
4744 Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:35:17 MEST 2000
4745 Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
4746 time_init: decrementer frequency = 187500000/60
4747 Calibrating delay loop... 49.77 BogoMIPS
4748 Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
4749 ...
wdenkc6097192002-11-03 00:24:07 +00004750
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02004751If you want to boot a Linux kernel with initial RAM disk, you pass
wdenk6c59edc2004-05-03 20:45:30 +00004752the memory addresses of both the kernel and the initrd image (PPBCOOT
4753format!) to the "bootm" command:
wdenkc6097192002-11-03 00:24:07 +00004754
wdenk6c59edc2004-05-03 20:45:30 +00004755 => imi 40100000 40200000
wdenkc6097192002-11-03 00:24:07 +00004756
wdenk6c59edc2004-05-03 20:45:30 +00004757 ## Checking Image at 40100000 ...
4758 Image Name: 2.2.13 for initrd on TQM850L
4759 Image Type: PowerPC Linux Kernel Image (gzip compressed)
4760 Data Size: 335725 Bytes = 327 kB = 0 MB
4761 Load Address: 00000000
4762 Entry Point: 0000000c
4763 Verifying Checksum ... OK
wdenkc6097192002-11-03 00:24:07 +00004764
wdenk6c59edc2004-05-03 20:45:30 +00004765 ## Checking Image at 40200000 ...
4766 Image Name: Simple Ramdisk Image
4767 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
4768 Data Size: 566530 Bytes = 553 kB = 0 MB
4769 Load Address: 00000000
4770 Entry Point: 00000000
4771 Verifying Checksum ... OK
wdenkc6097192002-11-03 00:24:07 +00004772
wdenk6c59edc2004-05-03 20:45:30 +00004773 => bootm 40100000 40200000
4774 ## Booting Linux kernel at 40100000 ...
4775 Image Name: 2.2.13 for initrd on TQM850L
4776 Image Type: PowerPC Linux Kernel Image (gzip compressed)
4777 Data Size: 335725 Bytes = 327 kB = 0 MB
4778 Load Address: 00000000
4779 Entry Point: 0000000c
4780 Verifying Checksum ... OK
4781 Uncompressing Kernel Image ... OK
4782 ## Loading RAMDisk Image at 40200000 ...
4783 Image Name: Simple Ramdisk Image
4784 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
4785 Data Size: 566530 Bytes = 553 kB = 0 MB
4786 Load Address: 00000000
4787 Entry Point: 00000000
4788 Verifying Checksum ... OK
4789 Loading Ramdisk ... OK
4790 Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:32:08 MEST 2000
4791 Boot arguments: root=/dev/ram
4792 time_init: decrementer frequency = 187500000/60
4793 Calibrating delay loop... 49.77 BogoMIPS
4794 ...
4795 RAMDISK: Compressed image found at block 0
4796 VFS: Mounted root (ext2 filesystem).
wdenkc6097192002-11-03 00:24:07 +00004797
wdenk6c59edc2004-05-03 20:45:30 +00004798 bash#
wdenkc6097192002-11-03 00:24:07 +00004799
Matthew McClintockefae4ca2006-06-28 10:41:37 -05004800Boot Linux and pass a flat device tree:
4801-----------
4802
4803First, U-Boot must be compiled with the appropriate defines. See the section
4804titled "Linux Kernel Interface" above for a more in depth explanation. The
4805following is an example of how to start a kernel and pass an updated
4806flat device tree:
4807
4808=> print oftaddr
4809oftaddr=0x300000
4810=> print oft
4811oft=oftrees/mpc8540ads.dtb
4812=> tftp $oftaddr $oft
4813Speed: 1000, full duplex
4814Using TSEC0 device
4815TFTP from server 192.168.1.1; our IP address is 192.168.1.101
4816Filename 'oftrees/mpc8540ads.dtb'.
4817Load address: 0x300000
4818Loading: #
4819done
4820Bytes transferred = 4106 (100a hex)
4821=> tftp $loadaddr $bootfile
4822Speed: 1000, full duplex
4823Using TSEC0 device
4824TFTP from server 192.168.1.1; our IP address is 192.168.1.2
4825Filename 'uImage'.
4826Load address: 0x200000
4827Loading:############
4828done
4829Bytes transferred = 1029407 (fb51f hex)
4830=> print loadaddr
4831loadaddr=200000
4832=> print oftaddr
4833oftaddr=0x300000
4834=> bootm $loadaddr - $oftaddr
4835## Booting image at 00200000 ...
Wolfgang Denk018147d2006-11-27 15:32:42 +01004836 Image Name: Linux-2.6.17-dirty
4837 Image Type: PowerPC Linux Kernel Image (gzip compressed)
4838 Data Size: 1029343 Bytes = 1005.2 kB
Matthew McClintockefae4ca2006-06-28 10:41:37 -05004839 Load Address: 00000000
Wolfgang Denk018147d2006-11-27 15:32:42 +01004840 Entry Point: 00000000
Matthew McClintockefae4ca2006-06-28 10:41:37 -05004841 Verifying Checksum ... OK
4842 Uncompressing Kernel Image ... OK
4843Booting using flat device tree at 0x300000
4844Using MPC85xx ADS machine description
4845Memory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
4846[snip]
4847
4848
wdenk6c59edc2004-05-03 20:45:30 +00004849More About U-Boot Image Types:
4850------------------------------
wdenkc6097192002-11-03 00:24:07 +00004851
wdenk6c59edc2004-05-03 20:45:30 +00004852U-Boot supports the following image types:
wdenkc6097192002-11-03 00:24:07 +00004853
wdenk6c59edc2004-05-03 20:45:30 +00004854 "Standalone Programs" are directly runnable in the environment
4855 provided by U-Boot; it is expected that (if they behave
4856 well) you can continue to work in U-Boot after return from
4857 the Standalone Program.
4858 "OS Kernel Images" are usually images of some Embedded OS which
4859 will take over control completely. Usually these programs
4860 will install their own set of exception handlers, device
4861 drivers, set up the MMU, etc. - this means, that you cannot
4862 expect to re-enter U-Boot except by resetting the CPU.
4863 "RAMDisk Images" are more or less just data blocks, and their
4864 parameters (address, size) are passed to an OS kernel that is
4865 being started.
4866 "Multi-File Images" contain several images, typically an OS
4867 (Linux) kernel image and one or more data images like
4868 RAMDisks. This construct is useful for instance when you want
4869 to boot over the network using BOOTP etc., where the boot
4870 server provides just a single image file, but you want to get
4871 for instance an OS kernel and a RAMDisk image.
wdenkc6097192002-11-03 00:24:07 +00004872
wdenk6c59edc2004-05-03 20:45:30 +00004873 "Multi-File Images" start with a list of image sizes, each
4874 image size (in bytes) specified by an "uint32_t" in network
4875 byte order. This list is terminated by an "(uint32_t)0".
4876 Immediately after the terminating 0 follow the images, one by
4877 one, all aligned on "uint32_t" boundaries (size rounded up to
4878 a multiple of 4 bytes).
wdenkc6097192002-11-03 00:24:07 +00004879
wdenk6c59edc2004-05-03 20:45:30 +00004880 "Firmware Images" are binary images containing firmware (like
4881 U-Boot or FPGA images) which usually will be programmed to
4882 flash memory.
wdenk4fc95692003-02-28 00:49:47 +00004883
wdenk6c59edc2004-05-03 20:45:30 +00004884 "Script files" are command sequences that will be executed by
4885 U-Boot's command interpreter; this feature is especially
4886 useful when you configure U-Boot to use a real shell (hush)
4887 as command interpreter.
wdenk4fc95692003-02-28 00:49:47 +00004888
Marek Vasutcf41a9b2012-03-14 21:52:45 +00004889Booting the Linux zImage:
4890-------------------------
4891
4892On some platforms, it's possible to boot Linux zImage. This is done
4893using the "bootz" command. The syntax of "bootz" command is the same
4894as the syntax of "bootm" command.
4895
Marek Vasut28850d02012-03-18 11:47:58 +00004896Note, defining the CONFIG_SUPPORT_INITRD_RAW allows user to supply
4897kernel with raw initrd images. The syntax is slightly different, the
4898address of the initrd must be augmented by it's size, in the following
4899format: "<initrd addres>:<initrd size>".
4900
stroeseb9c17c52003-04-04 15:53:41 +00004901
wdenk6c59edc2004-05-03 20:45:30 +00004902Standalone HOWTO:
4903=================
stroeseb9c17c52003-04-04 15:53:41 +00004904
wdenk6c59edc2004-05-03 20:45:30 +00004905One of the features of U-Boot is that you can dynamically load and
4906run "standalone" applications, which can use some resources of
4907U-Boot like console I/O functions or interrupt services.
stroeseb9c17c52003-04-04 15:53:41 +00004908
wdenk6c59edc2004-05-03 20:45:30 +00004909Two simple examples are included with the sources:
wdenk4fc95692003-02-28 00:49:47 +00004910
wdenk6c59edc2004-05-03 20:45:30 +00004911"Hello World" Demo:
4912-------------------
wdenkc6097192002-11-03 00:24:07 +00004913
wdenk6c59edc2004-05-03 20:45:30 +00004914'examples/hello_world.c' contains a small "Hello World" Demo
4915application; it is automatically compiled when you build U-Boot.
4916It's configured to run at address 0x00040004, so you can play with it
4917like that:
wdenkc6097192002-11-03 00:24:07 +00004918
wdenk6c59edc2004-05-03 20:45:30 +00004919 => loads
4920 ## Ready for S-Record download ...
4921 ~>examples/hello_world.srec
4922 1 2 3 4 5 6 7 8 9 10 11 ...
4923 [file transfer complete]
4924 [connected]
4925 ## Start Addr = 0x00040004
wdenkc6097192002-11-03 00:24:07 +00004926
wdenk6c59edc2004-05-03 20:45:30 +00004927 => go 40004 Hello World! This is a test.
4928 ## Starting application at 0x00040004 ...
4929 Hello World
4930 argc = 7
4931 argv[0] = "40004"
4932 argv[1] = "Hello"
4933 argv[2] = "World!"
4934 argv[3] = "This"
4935 argv[4] = "is"
4936 argv[5] = "a"
4937 argv[6] = "test."
4938 argv[7] = "<NULL>"
4939 Hit any key to exit ...
wdenkc6097192002-11-03 00:24:07 +00004940
wdenk6c59edc2004-05-03 20:45:30 +00004941 ## Application terminated, rc = 0x0
wdenkc6097192002-11-03 00:24:07 +00004942
wdenk6c59edc2004-05-03 20:45:30 +00004943Another example, which demonstrates how to register a CPM interrupt
4944handler with the U-Boot code, can be found in 'examples/timer.c'.
4945Here, a CPM timer is set up to generate an interrupt every second.
4946The interrupt service routine is trivial, just printing a '.'
4947character, but this is just a demo program. The application can be
4948controlled by the following keys:
wdenkc6097192002-11-03 00:24:07 +00004949
wdenk6c59edc2004-05-03 20:45:30 +00004950 ? - print current values og the CPM Timer registers
4951 b - enable interrupts and start timer
4952 e - stop timer and disable interrupts
4953 q - quit application
wdenkc6097192002-11-03 00:24:07 +00004954
wdenk6c59edc2004-05-03 20:45:30 +00004955 => loads
4956 ## Ready for S-Record download ...
4957 ~>examples/timer.srec
4958 1 2 3 4 5 6 7 8 9 10 11 ...
4959 [file transfer complete]
4960 [connected]
4961 ## Start Addr = 0x00040004
wdenkc6097192002-11-03 00:24:07 +00004962
wdenk6c59edc2004-05-03 20:45:30 +00004963 => go 40004
4964 ## Starting application at 0x00040004 ...
4965 TIMERS=0xfff00980
4966 Using timer 1
4967 tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
wdenkc6097192002-11-03 00:24:07 +00004968
wdenk6c59edc2004-05-03 20:45:30 +00004969Hit 'b':
4970 [q, b, e, ?] Set interval 1000000 us
4971 Enabling timer
4972Hit '?':
4973 [q, b, e, ?] ........
4974 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
4975Hit '?':
4976 [q, b, e, ?] .
4977 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
4978Hit '?':
4979 [q, b, e, ?] .
4980 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
4981Hit '?':
4982 [q, b, e, ?] .
4983 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
4984Hit 'e':
4985 [q, b, e, ?] ...Stopping timer
4986Hit 'q':
4987 [q, b, e, ?] ## Application terminated, rc = 0x0
wdenkc6097192002-11-03 00:24:07 +00004988
wdenkc6097192002-11-03 00:24:07 +00004989
wdenk6c59edc2004-05-03 20:45:30 +00004990Minicom warning:
4991================
wdenkc6097192002-11-03 00:24:07 +00004992
wdenk6c59edc2004-05-03 20:45:30 +00004993Over time, many people have reported problems when trying to use the
4994"minicom" terminal emulation program for serial download. I (wd)
4995consider minicom to be broken, and recommend not to use it. Under
4996Unix, I recommend to use C-Kermit for general purpose use (and
4997especially for kermit binary protocol download ("loadb" command), and
Karl O. Pinca0189bb2012-10-01 05:11:56 +00004998use "cu" for S-Record download ("loads" command). See
4999http://www.denx.de/wiki/view/DULG/SystemSetup#Section_4.3.
5000for help with kermit.
5001
wdenkc6097192002-11-03 00:24:07 +00005002
wdenk6c59edc2004-05-03 20:45:30 +00005003Nevertheless, if you absolutely want to use it try adding this
5004configuration to your "File transfer protocols" section:
wdenkc6097192002-11-03 00:24:07 +00005005
wdenk6c59edc2004-05-03 20:45:30 +00005006 Name Program Name U/D FullScr IO-Red. Multi
5007 X kermit /usr/bin/kermit -i -l %l -s Y U Y N N
5008 Y kermit /usr/bin/kermit -i -l %l -r N D Y N N
wdenk8dba0502003-03-31 16:34:49 +00005009
wdenk8dba0502003-03-31 16:34:49 +00005010
wdenk6c59edc2004-05-03 20:45:30 +00005011NetBSD Notes:
5012=============
wdenkc6097192002-11-03 00:24:07 +00005013
wdenk6c59edc2004-05-03 20:45:30 +00005014Starting at version 0.9.2, U-Boot supports NetBSD both as host
5015(build U-Boot) and target system (boots NetBSD/mpc8xx).
wdenk88e72a32003-06-19 23:04:19 +00005016
wdenk6c59edc2004-05-03 20:45:30 +00005017Building requires a cross environment; it is known to work on
5018NetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
5019need gmake since the Makefiles are not compatible with BSD make).
5020Note that the cross-powerpc package does not install include files;
5021attempting to build U-Boot will fail because <machine/ansi.h> is
5022missing. This file has to be installed and patched manually:
wdenk88e72a32003-06-19 23:04:19 +00005023
wdenk6c59edc2004-05-03 20:45:30 +00005024 # cd /usr/pkg/cross/powerpc-netbsd/include
5025 # mkdir powerpc
5026 # ln -s powerpc machine
5027 # cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
5028 # ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST
wdenk88e72a32003-06-19 23:04:19 +00005029
wdenk6c59edc2004-05-03 20:45:30 +00005030Native builds *don't* work due to incompatibilities between native
5031and U-Boot include files.
wdenkc6097192002-11-03 00:24:07 +00005032
wdenk6c59edc2004-05-03 20:45:30 +00005033Booting assumes that (the first part of) the image booted is a
5034stage-2 loader which in turn loads and then invokes the kernel
5035proper. Loader sources will eventually appear in the NetBSD source
5036tree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
wdenkd0245fc2005-04-13 10:02:42 +00005037meantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
wdenkc6097192002-11-03 00:24:07 +00005038
wdenkc6097192002-11-03 00:24:07 +00005039
wdenk6c59edc2004-05-03 20:45:30 +00005040Implementation Internals:
5041=========================
wdenkc6097192002-11-03 00:24:07 +00005042
wdenk6c59edc2004-05-03 20:45:30 +00005043The following is not intended to be a complete description of every
5044implementation detail. However, it should help to understand the
5045inner workings of U-Boot and make it easier to port it to custom
5046hardware.
wdenkc6097192002-11-03 00:24:07 +00005047
wdenkc6097192002-11-03 00:24:07 +00005048
wdenk6c59edc2004-05-03 20:45:30 +00005049Initial Stack, Global Data:
5050---------------------------
wdenkc6097192002-11-03 00:24:07 +00005051
wdenk6c59edc2004-05-03 20:45:30 +00005052The implementation of U-Boot is complicated by the fact that U-Boot
5053starts running out of ROM (flash memory), usually without access to
5054system RAM (because the memory controller is not initialized yet).
5055This means that we don't have writable Data or BSS segments, and BSS
5056is not initialized as zero. To be able to get a C environment working
5057at all, we have to allocate at least a minimal stack. Implementation
5058options for this are defined and restricted by the CPU used: Some CPU
5059models provide on-chip memory (like the IMMR area on MPC8xx and
5060MPC826x processors), on others (parts of) the data cache can be
5061locked as (mis-) used as memory, etc.
wdenkc6097192002-11-03 00:24:07 +00005062
Wolfgang Denkb240aef2008-03-26 10:40:12 +01005063 Chris Hallinan posted a good summary of these issues to the
Wolfgang Denk290ae6b2008-12-30 22:56:11 +01005064 U-Boot mailing list:
wdenkc6097192002-11-03 00:24:07 +00005065
wdenk6c59edc2004-05-03 20:45:30 +00005066 Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
5067 From: "Chris Hallinan" <clh@net1plus.com>
5068 Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
5069 ...
wdenkc6097192002-11-03 00:24:07 +00005070
wdenk6c59edc2004-05-03 20:45:30 +00005071 Correct me if I'm wrong, folks, but the way I understand it
5072 is this: Using DCACHE as initial RAM for Stack, etc, does not
5073 require any physical RAM backing up the cache. The cleverness
5074 is that the cache is being used as a temporary supply of
5075 necessary storage before the SDRAM controller is setup. It's
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02005076 beyond the scope of this list to explain the details, but you
wdenk6c59edc2004-05-03 20:45:30 +00005077 can see how this works by studying the cache architecture and
5078 operation in the architecture and processor-specific manuals.
wdenkc6097192002-11-03 00:24:07 +00005079
wdenk6c59edc2004-05-03 20:45:30 +00005080 OCM is On Chip Memory, which I believe the 405GP has 4K. It
5081 is another option for the system designer to use as an
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02005082 initial stack/RAM area prior to SDRAM being available. Either
wdenk6c59edc2004-05-03 20:45:30 +00005083 option should work for you. Using CS 4 should be fine if your
5084 board designers haven't used it for something that would
5085 cause you grief during the initial boot! It is frequently not
5086 used.
wdenkc6097192002-11-03 00:24:07 +00005087
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02005088 CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
wdenk6c59edc2004-05-03 20:45:30 +00005089 with your processor/board/system design. The default value
5090 you will find in any recent u-boot distribution in
Stefan Roese3e1f1b32005-08-01 16:49:12 +02005091 walnut.h should work for you. I'd set it to a value larger
wdenk6c59edc2004-05-03 20:45:30 +00005092 than your SDRAM module. If you have a 64MB SDRAM module, set
5093 it above 400_0000. Just make sure your board has no resources
5094 that are supposed to respond to that address! That code in
5095 start.S has been around a while and should work as is when
5096 you get the config right.
wdenk4a5c8a72003-03-06 00:02:04 +00005097
wdenk6c59edc2004-05-03 20:45:30 +00005098 -Chris Hallinan
5099 DS4.COM, Inc.
wdenk4a5c8a72003-03-06 00:02:04 +00005100
wdenk6c59edc2004-05-03 20:45:30 +00005101It is essential to remember this, since it has some impact on the C
5102code for the initialization procedures:
wdenk4a5c8a72003-03-06 00:02:04 +00005103
wdenk6c59edc2004-05-03 20:45:30 +00005104* Initialized global data (data segment) is read-only. Do not attempt
5105 to write it.
wdenk4a5c8a72003-03-06 00:02:04 +00005106
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02005107* Do not use any uninitialized global data (or implicitely initialized
wdenk6c59edc2004-05-03 20:45:30 +00005108 as zero data - BSS segment) at all - this is undefined, initiali-
5109 zation is performed later (when relocating to RAM).
wdenk4a5c8a72003-03-06 00:02:04 +00005110
wdenk6c59edc2004-05-03 20:45:30 +00005111* Stack space is very limited. Avoid big data buffers or things like
5112 that.
wdenk4a5c8a72003-03-06 00:02:04 +00005113
wdenk6c59edc2004-05-03 20:45:30 +00005114Having only the stack as writable memory limits means we cannot use
5115normal global data to share information beween the code. But it
5116turned out that the implementation of U-Boot can be greatly
5117simplified by making a global data structure (gd_t) available to all
5118functions. We could pass a pointer to this data as argument to _all_
5119functions, but this would bloat the code. Instead we use a feature of
5120the GCC compiler (Global Register Variables) to share the data: we
5121place a pointer (gd) to the global data into a register which we
5122reserve for this purpose.
wdenkc6097192002-11-03 00:24:07 +00005123
wdenk6c59edc2004-05-03 20:45:30 +00005124When choosing a register for such a purpose we are restricted by the
5125relevant (E)ABI specifications for the current architecture, and by
5126GCC's implementation.
wdenkc6097192002-11-03 00:24:07 +00005127
wdenk6c59edc2004-05-03 20:45:30 +00005128For PowerPC, the following registers have specific use:
5129 R1: stack pointer
Wolfgang Denk69c09642008-02-14 22:43:22 +01005130 R2: reserved for system use
wdenk6c59edc2004-05-03 20:45:30 +00005131 R3-R4: parameter passing and return values
5132 R5-R10: parameter passing
5133 R13: small data area pointer
5134 R30: GOT pointer
5135 R31: frame pointer
wdenkc6097192002-11-03 00:24:07 +00005136
Joakim Tjernlund693c0c12010-01-19 14:41:58 +01005137 (U-Boot also uses R12 as internal GOT pointer. r12
5138 is a volatile register so r12 needs to be reset when
5139 going back and forth between asm and C)
wdenkc6097192002-11-03 00:24:07 +00005140
Wolfgang Denk69c09642008-02-14 22:43:22 +01005141 ==> U-Boot will use R2 to hold a pointer to the global data
wdenkc6097192002-11-03 00:24:07 +00005142
wdenk6c59edc2004-05-03 20:45:30 +00005143 Note: on PPC, we could use a static initializer (since the
5144 address of the global data structure is known at compile time),
5145 but it turned out that reserving a register results in somewhat
5146 smaller code - although the code savings are not that big (on
5147 average for all boards 752 bytes for the whole U-Boot image,
5148 624 text + 127 data).
wdenkc6097192002-11-03 00:24:07 +00005149
Robin Getz2773d5f2009-08-17 15:23:02 +00005150On Blackfin, the normal C ABI (except for P3) is followed as documented here:
Mike Frysinger60f09302008-02-04 19:26:54 -05005151 http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
5152
Robin Getz2773d5f2009-08-17 15:23:02 +00005153 ==> U-Boot will use P3 to hold a pointer to the global data
Mike Frysinger60f09302008-02-04 19:26:54 -05005154
wdenk6c59edc2004-05-03 20:45:30 +00005155On ARM, the following registers are used:
wdenkc6097192002-11-03 00:24:07 +00005156
wdenk6c59edc2004-05-03 20:45:30 +00005157 R0: function argument word/integer result
5158 R1-R3: function argument word
5159 R9: GOT pointer
5160 R10: stack limit (used only if stack checking if enabled)
5161 R11: argument (frame) pointer
5162 R12: temporary workspace
5163 R13: stack pointer
5164 R14: link register
5165 R15: program counter
wdenkc6097192002-11-03 00:24:07 +00005166
wdenk6c59edc2004-05-03 20:45:30 +00005167 ==> U-Boot will use R8 to hold a pointer to the global data
wdenkc6097192002-11-03 00:24:07 +00005168
Thomas Chou8fa38582010-05-21 11:08:03 +08005169On Nios II, the ABI is documented here:
5170 http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf
5171
5172 ==> U-Boot will use gp to hold a pointer to the global data
5173
5174 Note: on Nios II, we give "-G0" option to gcc and don't use gp
5175 to access small data sections, so gp is free.
5176
Macpaul Lin1cac36e2011-10-19 20:41:11 +00005177On NDS32, the following registers are used:
5178
5179 R0-R1: argument/return
5180 R2-R5: argument
5181 R15: temporary register for assembler
5182 R16: trampoline register
5183 R28: frame pointer (FP)
5184 R29: global pointer (GP)
5185 R30: link register (LP)
5186 R31: stack pointer (SP)
5187 PC: program counter (PC)
5188
5189 ==> U-Boot will use R10 to hold a pointer to the global data
5190
Wolfgang Denk6405a152006-03-31 18:32:53 +02005191NOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
5192or current versions of GCC may "optimize" the code too much.
wdenkc6097192002-11-03 00:24:07 +00005193
wdenk6c59edc2004-05-03 20:45:30 +00005194Memory Management:
5195------------------
wdenkc6097192002-11-03 00:24:07 +00005196
wdenk6c59edc2004-05-03 20:45:30 +00005197U-Boot runs in system state and uses physical addresses, i.e. the
5198MMU is not used either for address mapping nor for memory protection.
wdenkc6097192002-11-03 00:24:07 +00005199
wdenk6c59edc2004-05-03 20:45:30 +00005200The available memory is mapped to fixed addresses using the memory
5201controller. In this process, a contiguous block is formed for each
5202memory type (Flash, SDRAM, SRAM), even when it consists of several
5203physical memory banks.
wdenkc6097192002-11-03 00:24:07 +00005204
wdenk6c59edc2004-05-03 20:45:30 +00005205U-Boot is installed in the first 128 kB of the first Flash bank (on
5206TQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
5207booting and sizing and initializing DRAM, the code relocates itself
5208to the upper end of DRAM. Immediately below the U-Boot code some
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02005209memory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
wdenk6c59edc2004-05-03 20:45:30 +00005210configuration setting]. Below that, a structure with global Board
5211Info data is placed, followed by the stack (growing downward).
wdenkc6097192002-11-03 00:24:07 +00005212
wdenk6c59edc2004-05-03 20:45:30 +00005213Additionally, some exception handler code is copied to the low 8 kB
5214of DRAM (0x00000000 ... 0x00001FFF).
wdenkc6097192002-11-03 00:24:07 +00005215
wdenk6c59edc2004-05-03 20:45:30 +00005216So a typical memory configuration with 16 MB of DRAM could look like
5217this:
wdenkc6097192002-11-03 00:24:07 +00005218
wdenk6c59edc2004-05-03 20:45:30 +00005219 0x0000 0000 Exception Vector code
5220 :
5221 0x0000 1FFF
5222 0x0000 2000 Free for Application Use
5223 :
5224 :
wdenkc6097192002-11-03 00:24:07 +00005225
wdenk6c59edc2004-05-03 20:45:30 +00005226 :
5227 :
5228 0x00FB FF20 Monitor Stack (Growing downward)
5229 0x00FB FFAC Board Info Data and permanent copy of global data
5230 0x00FC 0000 Malloc Arena
5231 :
5232 0x00FD FFFF
5233 0x00FE 0000 RAM Copy of Monitor Code
5234 ... eventually: LCD or video framebuffer
5235 ... eventually: pRAM (Protected RAM - unchanged by reset)
5236 0x00FF FFFF [End of RAM]
wdenkc6097192002-11-03 00:24:07 +00005237
wdenkc6097192002-11-03 00:24:07 +00005238
wdenk6c59edc2004-05-03 20:45:30 +00005239System Initialization:
5240----------------------
wdenkc6097192002-11-03 00:24:07 +00005241
wdenk6c59edc2004-05-03 20:45:30 +00005242In the reset configuration, U-Boot starts at the reset entry point
Marcel Ziswilerabd8dcb2008-07-09 08:17:15 +02005243(on most PowerPC systems at address 0x00000100). Because of the reset
wdenk6c59edc2004-05-03 20:45:30 +00005244configuration for CS0# this is a mirror of the onboard Flash memory.
5245To be able to re-map memory U-Boot then jumps to its link address.
5246To be able to implement the initialization code in C, a (small!)
5247initial stack is set up in the internal Dual Ported RAM (in case CPUs
5248which provide such a feature like MPC8xx or MPC8260), or in a locked
5249part of the data cache. After that, U-Boot initializes the CPU core,
5250the caches and the SIU.
wdenkc6097192002-11-03 00:24:07 +00005251
wdenk6c59edc2004-05-03 20:45:30 +00005252Next, all (potentially) available memory banks are mapped using a
5253preliminary mapping. For example, we put them on 512 MB boundaries
5254(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
5255on 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
5256programmed for SDRAM access. Using the temporary configuration, a
5257simple memory test is run that determines the size of the SDRAM
5258banks.
wdenkc6097192002-11-03 00:24:07 +00005259
wdenk6c59edc2004-05-03 20:45:30 +00005260When there is more than one SDRAM bank, and the banks are of
5261different size, the largest is mapped first. For equal size, the first
5262bank (CS2#) is mapped first. The first mapping is always for address
52630x00000000, with any additional banks following immediately to create
5264contiguous memory starting from 0.
wdenkc6097192002-11-03 00:24:07 +00005265
wdenk6c59edc2004-05-03 20:45:30 +00005266Then, the monitor installs itself at the upper end of the SDRAM area
5267and allocates memory for use by malloc() and for the global Board
5268Info data; also, the exception vector code is copied to the low RAM
5269pages, and the final stack is set up.
wdenkc6097192002-11-03 00:24:07 +00005270
wdenk6c59edc2004-05-03 20:45:30 +00005271Only after this relocation will you have a "normal" C environment;
5272until that you are restricted in several ways, mostly because you are
5273running from ROM, and because the code will have to be relocated to a
5274new address in RAM.
wdenkc6097192002-11-03 00:24:07 +00005275
wdenkc6097192002-11-03 00:24:07 +00005276
wdenk6c59edc2004-05-03 20:45:30 +00005277U-Boot Porting Guide:
5278----------------------
wdenkc6097192002-11-03 00:24:07 +00005279
wdenk6c59edc2004-05-03 20:45:30 +00005280[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
5281list, October 2002]
wdenkc6097192002-11-03 00:24:07 +00005282
wdenkc6097192002-11-03 00:24:07 +00005283
Jerry Van Barenba0687c2009-07-15 20:42:59 -04005284int main(int argc, char *argv[])
wdenk6c59edc2004-05-03 20:45:30 +00005285{
5286 sighandler_t no_more_time;
wdenkc6097192002-11-03 00:24:07 +00005287
Jerry Van Barenba0687c2009-07-15 20:42:59 -04005288 signal(SIGALRM, no_more_time);
5289 alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
wdenkc6097192002-11-03 00:24:07 +00005290
wdenk6c59edc2004-05-03 20:45:30 +00005291 if (available_money > available_manpower) {
Jerry Van Barenba0687c2009-07-15 20:42:59 -04005292 Pay consultant to port U-Boot;
wdenk6c59edc2004-05-03 20:45:30 +00005293 return 0;
5294 }
wdenkc6097192002-11-03 00:24:07 +00005295
wdenk6c59edc2004-05-03 20:45:30 +00005296 Download latest U-Boot source;
wdenk34b613e2002-12-17 01:51:00 +00005297
Wolfgang Denk290ae6b2008-12-30 22:56:11 +01005298 Subscribe to u-boot mailing list;
wdenkc6097192002-11-03 00:24:07 +00005299
Jerry Van Barenba0687c2009-07-15 20:42:59 -04005300 if (clueless)
5301 email("Hi, I am new to U-Boot, how do I get started?");
wdenkc6097192002-11-03 00:24:07 +00005302
wdenk6c59edc2004-05-03 20:45:30 +00005303 while (learning) {
5304 Read the README file in the top level directory;
Jerry Van Barenba0687c2009-07-15 20:42:59 -04005305 Read http://www.denx.de/twiki/bin/view/DULG/Manual;
5306 Read applicable doc/*.README;
wdenk6c59edc2004-05-03 20:45:30 +00005307 Read the source, Luke;
Jerry Van Barenba0687c2009-07-15 20:42:59 -04005308 /* find . -name "*.[chS]" | xargs grep -i <keyword> */
wdenk6c59edc2004-05-03 20:45:30 +00005309 }
wdenkc6097192002-11-03 00:24:07 +00005310
Jerry Van Barenba0687c2009-07-15 20:42:59 -04005311 if (available_money > toLocalCurrency ($2500))
5312 Buy a BDI3000;
5313 else
wdenk6c59edc2004-05-03 20:45:30 +00005314 Add a lot of aggravation and time;
wdenkc6097192002-11-03 00:24:07 +00005315
Jerry Van Barenba0687c2009-07-15 20:42:59 -04005316 if (a similar board exists) { /* hopefully... */
5317 cp -a board/<similar> board/<myboard>
5318 cp include/configs/<similar>.h include/configs/<myboard>.h
5319 } else {
5320 Create your own board support subdirectory;
5321 Create your own board include/configs/<myboard>.h file;
5322 }
5323 Edit new board/<myboard> files
5324 Edit new include/configs/<myboard>.h
wdenkc6097192002-11-03 00:24:07 +00005325
Jerry Van Barenba0687c2009-07-15 20:42:59 -04005326 while (!accepted) {
5327 while (!running) {
5328 do {
5329 Add / modify source code;
5330 } until (compiles);
5331 Debug;
5332 if (clueless)
5333 email("Hi, I am having problems...");
5334 }
5335 Send patch file to the U-Boot email list;
5336 if (reasonable critiques)
5337 Incorporate improvements from email list code review;
5338 else
5339 Defend code as written;
wdenk634d2f72004-04-15 23:14:49 +00005340 }
wdenkc6097192002-11-03 00:24:07 +00005341
wdenk6c59edc2004-05-03 20:45:30 +00005342 return 0;
5343}
wdenkc6097192002-11-03 00:24:07 +00005344
wdenk6c59edc2004-05-03 20:45:30 +00005345void no_more_time (int sig)
5346{
5347 hire_a_guru();
5348}
wdenkc6097192002-11-03 00:24:07 +00005349
wdenkc6097192002-11-03 00:24:07 +00005350
wdenk6c59edc2004-05-03 20:45:30 +00005351Coding Standards:
5352-----------------
wdenkc6097192002-11-03 00:24:07 +00005353
wdenk6c59edc2004-05-03 20:45:30 +00005354All contributions to U-Boot should conform to the Linux kernel
Detlev Zundelaa63d482006-09-01 15:39:02 +02005355coding style; see the file "Documentation/CodingStyle" and the script
Wolfgang Denk20bd2a62011-07-27 10:59:55 +00005356"scripts/Lindent" in your Linux kernel source directory.
Detlev Zundelaa63d482006-09-01 15:39:02 +02005357
5358Source files originating from a different project (for example the
5359MTD subsystem) are generally exempt from these guidelines and are not
5360reformated to ease subsequent migration to newer versions of those
5361sources.
wdenkc6097192002-11-03 00:24:07 +00005362
Detlev Zundelaa63d482006-09-01 15:39:02 +02005363Please note that U-Boot is implemented in C (and to some small parts in
5364Assembler); no C++ is used, so please do not use C++ style comments (//)
5365in your code.
wdenkad276f22004-01-04 16:28:35 +00005366
wdenk6c59edc2004-05-03 20:45:30 +00005367Please also stick to the following formatting rules:
5368- remove any trailing white space
Wolfgang Denk20bd2a62011-07-27 10:59:55 +00005369- use TAB characters for indentation and vertical alignment, not spaces
wdenk6c59edc2004-05-03 20:45:30 +00005370- make sure NOT to use DOS '\r\n' line feeds
Wolfgang Denk20bd2a62011-07-27 10:59:55 +00005371- do not add more than 2 consecutive empty lines to source files
wdenk6c59edc2004-05-03 20:45:30 +00005372- do not add trailing empty lines to source files
wdenkc6097192002-11-03 00:24:07 +00005373
wdenk6c59edc2004-05-03 20:45:30 +00005374Submissions which do not conform to the standards may be returned
5375with a request to reformat the changes.
wdenkc6097192002-11-03 00:24:07 +00005376
wdenkc6097192002-11-03 00:24:07 +00005377
wdenk6c59edc2004-05-03 20:45:30 +00005378Submitting Patches:
5379-------------------
wdenkc6097192002-11-03 00:24:07 +00005380
wdenk6c59edc2004-05-03 20:45:30 +00005381Since the number of patches for U-Boot is growing, we need to
5382establish some rules. Submissions which do not conform to these rules
5383may be rejected, even when they contain important and valuable stuff.
wdenkc6097192002-11-03 00:24:07 +00005384
Magnus Liljaf3b287b2008-08-06 19:32:33 +02005385Please see http://www.denx.de/wiki/U-Boot/Patches for details.
Wolfgang Denkb240aef2008-03-26 10:40:12 +01005386
Wolfgang Denk290ae6b2008-12-30 22:56:11 +01005387Patches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
5388see http://lists.denx.de/mailman/listinfo/u-boot
5389
wdenk6c59edc2004-05-03 20:45:30 +00005390When you send a patch, please include the following information with
5391it:
wdenkc6097192002-11-03 00:24:07 +00005392
wdenk6c59edc2004-05-03 20:45:30 +00005393* For bug fixes: a description of the bug and how your patch fixes
5394 this bug. Please try to include a way of demonstrating that the
5395 patch actually fixes something.
wdenkc6097192002-11-03 00:24:07 +00005396
wdenk6c59edc2004-05-03 20:45:30 +00005397* For new features: a description of the feature and your
5398 implementation.
wdenkc6097192002-11-03 00:24:07 +00005399
wdenk6c59edc2004-05-03 20:45:30 +00005400* A CHANGELOG entry as plaintext (separate from the patch)
wdenkc6097192002-11-03 00:24:07 +00005401
wdenk6c59edc2004-05-03 20:45:30 +00005402* For major contributions, your entry to the CREDITS file
wdenkc6097192002-11-03 00:24:07 +00005403
wdenk6c59edc2004-05-03 20:45:30 +00005404* When you add support for a new board, don't forget to add this
Wolfgang Denk20bd2a62011-07-27 10:59:55 +00005405 board to the MAINTAINERS file, too.
wdenkc6097192002-11-03 00:24:07 +00005406
wdenk6c59edc2004-05-03 20:45:30 +00005407* If your patch adds new configuration options, don't forget to
5408 document these in the README file.
wdenkc6097192002-11-03 00:24:07 +00005409
Wolfgang Denkb240aef2008-03-26 10:40:12 +01005410* The patch itself. If you are using git (which is *strongly*
5411 recommended) you can easily generate the patch using the
Wolfgang Denk20bd2a62011-07-27 10:59:55 +00005412 "git format-patch". If you then use "git send-email" to send it to
Wolfgang Denkb240aef2008-03-26 10:40:12 +01005413 the U-Boot mailing list, you will avoid most of the common problems
5414 with some other mail clients.
wdenkca9bc762003-07-15 07:45:49 +00005415
Wolfgang Denkb240aef2008-03-26 10:40:12 +01005416 If you cannot use git, use "diff -purN OLD NEW". If your version of
5417 diff does not support these options, then get the latest version of
5418 GNU diff.
wdenkc6097192002-11-03 00:24:07 +00005419
Wolfgang Denkb240aef2008-03-26 10:40:12 +01005420 The current directory when running this command shall be the parent
5421 directory of the U-Boot source tree (i. e. please make sure that
5422 your patch includes sufficient directory information for the
5423 affected files).
5424
5425 We prefer patches as plain text. MIME attachments are discouraged,
5426 and compressed attachments must not be used.
wdenk88e72a32003-06-19 23:04:19 +00005427
wdenk6c59edc2004-05-03 20:45:30 +00005428* If one logical set of modifications affects or creates several
5429 files, all these changes shall be submitted in a SINGLE patch file.
wdenk57b2d802003-06-27 21:31:46 +00005430
wdenk6c59edc2004-05-03 20:45:30 +00005431* Changesets that contain different, unrelated modifications shall be
5432 submitted as SEPARATE patches, one patch per changeset.
wdenk88e72a32003-06-19 23:04:19 +00005433
wdenkc6097192002-11-03 00:24:07 +00005434
wdenk6c59edc2004-05-03 20:45:30 +00005435Notes:
wdenkc6097192002-11-03 00:24:07 +00005436
wdenk6c59edc2004-05-03 20:45:30 +00005437* Before sending the patch, run the MAKEALL script on your patched
5438 source tree and make sure that no errors or warnings are reported
5439 for any of the boards.
5440
5441* Keep your modifications to the necessary minimum: A patch
5442 containing several unrelated changes or arbitrary reformats will be
5443 returned with a request to re-formatting / split it.
wdenkc6097192002-11-03 00:24:07 +00005444
wdenk6c59edc2004-05-03 20:45:30 +00005445* If you modify existing code, make sure that your new code does not
5446 add to the memory footprint of the code ;-) Small is beautiful!
5447 When adding new features, these should compile conditionally only
5448 (using #ifdef), and the resulting code with the new feature
5449 disabled must not need more memory than the old code without your
5450 modification.
wdenkcbc49a52005-05-03 14:12:25 +00005451
Wolfgang Denk290ae6b2008-12-30 22:56:11 +01005452* Remember that there is a size limit of 100 kB per message on the
5453 u-boot mailing list. Bigger patches will be moderated. If they are
5454 reasonable and not too big, they will be acknowledged. But patches
5455 bigger than the size limit should be avoided.