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Marek Vasut926227e2011-11-08 23:18:21 +00001/*
2 * armboot - Startup Code for ARM926EJS CPU-core
3 *
4 * Copyright (c) 2003 Texas Instruments
5 *
6 * ----- Adapted for OMAP1610 OMAP730 from ARM925t code ------
7 *
8 * Copyright (c) 2001 Marius Groger <mag@sysgo.de>
9 * Copyright (c) 2002 Alex Zupke <azu@sysgo.de>
10 * Copyright (c) 2002 Gary Jennejohn <garyj@denx.de>
11 * Copyright (c) 2003 Richard Woodruff <r-woodruff2@ti.com>
12 * Copyright (c) 2003 Kshitij <kshitij@ti.com>
13 * Copyright (c) 2010 Albert Aribaud <albert.u.boot@aribaud.net>
14 *
15 * Change to support call back into iMX28 bootrom
16 * Copyright (c) 2011 Marek Vasut <marek.vasut@gmail.com>
17 * on behalf of DENX Software Engineering GmbH
18 *
19 * See file CREDITS for list of people who contributed to this
20 * project.
21 *
22 * This program is free software; you can redistribute it and/or
23 * modify it under the terms of the GNU General Public License as
24 * published by the Free Software Foundation; either version 2 of
25 * the License, or (at your option) any later version.
26 *
27 * This program is distributed in the hope that it will be useful,
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
30 * GNU General Public License for more details.
31 *
32 * You should have received a copy of the GNU General Public License
33 * along with this program; if not, write to the Free Software
34 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
35 * MA 02111-1307 USA
36 */
37
38#include <asm-offsets.h>
39#include <config.h>
40#include <common.h>
41#include <version.h>
42
Marek Vasut926227e2011-11-08 23:18:21 +000043/*
44 *************************************************************************
45 *
46 * Jump vector table as in table 3.1 in [1]
47 *
48 *************************************************************************
49 */
50
51
52.globl _start
53_start:
54 b reset
Marek Vasut5bf48fb2011-11-08 23:18:23 +000055 b undefined_instruction
56 b software_interrupt
57 b prefetch_abort
58 b data_abort
59 b not_used
60 b irq
61 b fiq
Marek Vasut926227e2011-11-08 23:18:21 +000062
Marek Vasut5bf48fb2011-11-08 23:18:23 +000063/*
64 * Vector table, located at address 0x20.
65 * This table allows the code running AFTER SPL, the U-Boot, to install it's
66 * interrupt handlers here. The problem is that the U-Boot is loaded into RAM,
67 * including it's interrupt vectoring table and the table at 0x0 is still the
68 * SPLs. So if interrupt happens in U-Boot, the SPLs interrupt vectoring table
69 * is still used.
70 */
71_vt_reset:
72 .word _reset
73_vt_undefined_instruction:
74 .word _hang
75_vt_software_interrupt:
76 .word _hang
77_vt_prefetch_abort:
78 .word _hang
79_vt_data_abort:
80 .word _hang
81_vt_not_used:
82 .word _reset
83_vt_irq:
84 .word _hang
85_vt_fiq:
86 .word _hang
Marek Vasut926227e2011-11-08 23:18:21 +000087
Marek Vasut5bf48fb2011-11-08 23:18:23 +000088reset:
89 ldr pc, _vt_reset
90undefined_instruction:
91 ldr pc, _vt_undefined_instruction
92software_interrupt:
93 ldr pc, _vt_software_interrupt
94prefetch_abort:
95 ldr pc, _vt_prefetch_abort
96data_abort:
97 ldr pc, _vt_data_abort
98not_used:
99 ldr pc, _vt_not_used
100irq:
101 ldr pc, _vt_irq
102fiq:
103 ldr pc, _vt_fiq
Marek Vasut926227e2011-11-08 23:18:21 +0000104
Marek Vasut926227e2011-11-08 23:18:21 +0000105 .balignl 16,0xdeadbeef
106
Marek Vasut926227e2011-11-08 23:18:21 +0000107/*
108 *************************************************************************
109 *
110 * Startup Code (reset vector)
111 *
112 * do important init only if we don't start from memory!
113 * setup Memory and board specific bits prior to relocation.
114 * relocate armboot to ram
115 * setup stack
116 *
117 *************************************************************************
118 */
119
120.globl _TEXT_BASE
121_TEXT_BASE:
122 .word CONFIG_SYS_TEXT_BASE
123
124/*
125 * These are defined in the board-specific linker script.
126 * Subtracting _start from them lets the linker put their
127 * relative position in the executable instead of leaving
128 * them null.
129 */
130.globl _bss_start_ofs
131_bss_start_ofs:
132 .word __bss_start - _start
133
134.globl _bss_end_ofs
135_bss_end_ofs:
136 .word __bss_end__ - _start
137
138.globl _end_ofs
139_end_ofs:
140 .word _end - _start
141
142#ifdef CONFIG_USE_IRQ
143/* IRQ stack memory (calculated at run-time) */
144.globl IRQ_STACK_START
145IRQ_STACK_START:
146 .word 0x0badc0de
147
148/* IRQ stack memory (calculated at run-time) */
149.globl FIQ_STACK_START
150FIQ_STACK_START:
151 .word 0x0badc0de
152#endif
153
154/* IRQ stack memory (calculated at run-time) + 8 bytes */
155.globl IRQ_STACK_START_IN
156IRQ_STACK_START_IN:
157 .word 0x0badc0de
158
159/*
160 * the actual reset code
161 */
162
Marek Vasut5bf48fb2011-11-08 23:18:23 +0000163_reset:
Marek Vasut926227e2011-11-08 23:18:21 +0000164 /*
165 * Store all registers on old stack pointer, this will allow us later to
166 * return to the BootROM and let the BootROM load U-Boot into RAM.
167 */
168 push {r0-r12,r14}
169
Matthias Fuchsdcb3a8a2012-02-06 23:32:42 +0000170 /* save control register c1 */
171 mrc p15, 0, r0, c1, c0, 0
172 push {r0}
173
Marek Vasut926227e2011-11-08 23:18:21 +0000174 /*
Matthias Fuchsdcb3a8a2012-02-06 23:32:42 +0000175 * set the cpu to SVC32 mode and store old CPSR register content
Marek Vasut926227e2011-11-08 23:18:21 +0000176 */
177 mrs r0,cpsr
Matthias Fuchsdcb3a8a2012-02-06 23:32:42 +0000178 push {r0}
Marek Vasut926227e2011-11-08 23:18:21 +0000179 bic r0,r0,#0x1f
180 orr r0,r0,#0xd3
181 msr cpsr,r0
182
Marek Vasut926227e2011-11-08 23:18:21 +0000183 bl board_init_ll
184
Matthias Fuchsdcb3a8a2012-02-06 23:32:42 +0000185 /*
186 * restore bootrom's cpu mode (especially FIQ)
187 */
188 pop {r0}
189 msr cpsr,r0
190
191 /*
192 * restore c1 register
193 * (especially set exception vector location back to
194 * bootrom space which is required by bootrom for USB boot)
195 */
196 pop {r0}
197 mcr p15, 0, r0, c1, c0, 0
198
Marek Vasut926227e2011-11-08 23:18:21 +0000199 pop {r0-r12,r14}
200 bx lr
201
Marek Vasut5bf48fb2011-11-08 23:18:23 +0000202_hang:
Marek Vasut926227e2011-11-08 23:18:21 +0000203 ldr sp, _TEXT_BASE /* switch to abort stack */
2041:
205 bl 1b /* hang and never return */