| /* |
| * (C) Copyright 2008-2011 |
| * Graeme Russ, <graeme.russ@gmail.com> |
| * |
| * (C) Copyright 2002 |
| * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se> |
| * |
| * (C) Copyright 2002 |
| * Wolfgang Denk, DENX Software Engineering, <wd@denx.de> |
| * |
| * (C) Copyright 2002 |
| * Sysgo Real-Time Solutions, GmbH <www.elinos.com> |
| * Marius Groeger <mgroeger@sysgo.de> |
| * |
| * See file CREDITS for list of people who contributed to this |
| * project. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of |
| * the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| * MA 02111-1307 USA |
| */ |
| |
| #include <common.h> |
| #include <fdtdec.h> |
| #include <watchdog.h> |
| #include <stdio_dev.h> |
| #include <asm/u-boot-x86.h> |
| #include <asm/relocate.h> |
| #include <asm/processor.h> |
| #include <asm/sections.h> |
| |
| #include <asm/init_helpers.h> |
| #include <asm/init_wrappers.h> |
| |
| /* |
| * Breath some life into the board... |
| * |
| * Getting the board up and running is a three-stage process: |
| * 1) Execute from Flash, SDRAM Uninitialised |
| * At this point, there is a limited amount of non-SDRAM memory |
| * (typically the CPU cache, but can also be SRAM or even a buffer of |
| * of some peripheral). This limited memory is used to hold: |
| * - The initial copy of the Global Data Structure |
| * - A temporary stack |
| * - A temporary x86 Global Descriptor Table |
| * - The pre-console buffer (if enabled) |
| * |
| * The following is performed during this phase of execution: |
| * - Core low-level CPU initialisation |
| * - Console initialisation |
| * - SDRAM initialisation |
| * |
| * 2) Execute from Flash, SDRAM Initialised |
| * At this point we copy Global Data from the initial non-SDRAM |
| * memory and set up the permanent stack in SDRAM. The CPU cache is no |
| * longer being used as temporary memory, so we can now fully enable |
| * it. |
| * |
| * The following is performed during this phase of execution: |
| * - Create final stack in SDRAM |
| * - Copy Global Data from temporary memory to SDRAM |
| * - Enabling of CPU cache(s), |
| * - Copying of U-Boot code and data from Flash to RAM |
| * - Clearing of the BSS |
| * - ELF relocation adjustments |
| * |
| * 3) Execute from SDRAM |
| * The following is performed during this phase of execution: |
| * - All remaining initialisation |
| */ |
| |
| /* |
| * The requirements for any new initalization function is simple: it is |
| * a function with no parameters which returns an integer return code, |
| * where 0 means "continue" and != 0 means "fatal error, hang the system" |
| */ |
| typedef int (init_fnc_t) (void); |
| |
| /* |
| * init_sequence_f is the list of init functions which are run when U-Boot |
| * is executing from Flash with a limited 'C' environment. The following |
| * limitations must be considered when implementing an '_f' function: |
| * - 'static' variables are read-only |
| * - Global Data (gd->xxx) is read/write |
| * - Stack space is limited |
| * |
| * The '_f' sequence must, as a minimum, initialise SDRAM. It _should_ |
| * also initialise the console (to provide early debug output) |
| */ |
| init_fnc_t *init_sequence_f[] = { |
| cpu_init_f, |
| board_early_init_f, |
| #ifdef CONFIG_OF_CONTROL |
| find_fdt, |
| fdtdec_check_fdt, |
| #endif |
| env_init, |
| init_baudrate_f, |
| serial_init, |
| console_init_f, |
| #ifdef CONFIG_OF_CONTROL |
| prepare_fdt, |
| #endif |
| dram_init_f, |
| calculate_relocation_address, |
| |
| NULL, |
| }; |
| |
| /* |
| * init_sequence_f_r is the list of init functions which are run when |
| * U-Boot is executing from Flash with a semi-limited 'C' environment. |
| * The following limitations must be considered when implementing an |
| * '_f_r' function: |
| * - 'static' variables are read-only |
| * - Global Data (gd->xxx) is read/write |
| * |
| * The '_f_r' sequence must, as a minimum, copy U-Boot to RAM (if |
| * supported). It _should_, if possible, copy global data to RAM and |
| * initialise the CPU caches (to speed up the relocation process) |
| */ |
| init_fnc_t *init_sequence_f_r[] = { |
| init_cache_f_r, |
| copy_uboot_to_ram, |
| copy_fdt_to_ram, |
| clear_bss, |
| do_elf_reloc_fixups, |
| |
| NULL, |
| }; |
| |
| /* |
| * init_sequence_r is the list of init functions which are run when U-Boot |
| * is executing from RAM with a full 'C' environment. There are no longer |
| * any limitations which must be considered when implementing an '_r' |
| * function, (i.e.'static' variables are read/write) |
| * |
| * If not already done, the '_r' sequence must copy global data to RAM and |
| * (should) initialise the CPU caches. |
| */ |
| init_fnc_t *init_sequence_r[] = { |
| set_reloc_flag_r, |
| init_bd_struct_r, |
| mem_malloc_init_r, |
| cpu_init_r, |
| board_early_init_r, |
| dram_init, |
| interrupt_init, |
| timer_init, |
| display_banner, |
| display_dram_config, |
| serial_initialize_r, |
| #ifndef CONFIG_SYS_NO_FLASH |
| flash_init_r, |
| #endif |
| #ifdef CONFIG_PCI |
| pci_init_r, |
| #endif |
| #ifdef CONFIG_SPI |
| init_func_spi, |
| #endif |
| env_relocate_r, |
| stdio_init, |
| jumptable_init_r, |
| console_init_r, |
| #ifdef CONFIG_MISC_INIT_R |
| misc_init_r, |
| #endif |
| #if defined(CONFIG_CMD_KGDB) |
| kgdb_init_r, |
| #endif |
| enable_interrupts_r, |
| #ifdef CONFIG_STATUS_LED |
| status_led_set_r, |
| #endif |
| set_load_addr_r, |
| #if defined(CONFIG_CMD_IDE) |
| ide_init_r, |
| #endif |
| #if defined(CONFIG_CMD_SCSI) |
| scsi_init_r, |
| #endif |
| #if defined(CONFIG_CMD_DOC) |
| doc_init_r, |
| #endif |
| #ifdef CONFIG_BITBANGMII |
| bb_miiphy_init_r, |
| #endif |
| #if defined(CONFIG_CMD_NET) |
| eth_initialize_r, |
| #ifdef CONFIG_RESET_PHY_R |
| reset_phy_r, |
| #endif |
| #endif |
| #ifdef CONFIG_LAST_STAGE_INIT |
| last_stage_init, |
| #endif |
| NULL, |
| }; |
| |
| static void do_init_loop(init_fnc_t **init_fnc_ptr) |
| { |
| for (; *init_fnc_ptr; ++init_fnc_ptr) { |
| WATCHDOG_RESET(); |
| if ((*init_fnc_ptr)() != 0) |
| hang(); |
| } |
| } |
| |
| void board_init_f(ulong boot_flags) |
| { |
| gd->fdt_blob = gd->new_fdt = NULL; |
| gd->flags = boot_flags; |
| |
| do_init_loop(init_sequence_f); |
| |
| /* |
| * SDRAM and console are now initialised. The final stack can now |
| * be setup in SDRAM. Code execution will continue in Flash, but |
| * with the stack in SDRAM and Global Data in temporary memory |
| * (CPU cache) |
| */ |
| board_init_f_r_trampoline(gd->start_addr_sp); |
| |
| /* NOTREACHED - board_init_f_r_trampoline() does not return */ |
| while (1) |
| ; |
| } |
| |
| void board_init_f_r(void) |
| { |
| do_init_loop(init_sequence_f_r); |
| |
| /* |
| * U-Boot has been copied into SDRAM, the BSS has been cleared etc. |
| * Transfer execution from Flash to RAM by calculating the address |
| * of the in-RAM copy of board_init_r() and calling it |
| */ |
| (board_init_r + gd->reloc_off)(gd, gd->relocaddr); |
| |
| /* NOTREACHED - board_init_r() does not return */ |
| while (1) |
| ; |
| } |
| |
| void board_init_r(gd_t *id, ulong dest_addr) |
| { |
| do_init_loop(init_sequence_r); |
| |
| /* main_loop() can return to retry autoboot, if so just run it again. */ |
| for (;;) |
| main_loop(); |
| |
| /* NOTREACHED - no way out of command loop except booting */ |
| } |
| |
| void hang(void) |
| { |
| puts("### ERROR ### Please RESET the board ###\n"); |
| for (;;) |
| ; |
| } |