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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Linus Nielsen Feltzing
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
/* Arm bootloader and startup code based on startup.s from the iPodLinux loader
*
* Copyright (c) 2003, Daniel Palffy (dpalffy (at) rainstorm.org)
* Copyright (c) 2005, Bernard Leach <leachbj@bouncycastle.org>
*
*/
#include "config.h"
#include "cpu.h"
.section .init.text,"ax",%progbits
.global start
/* Telechips firmware files start with a 32-byte header, as part of the code. */
start:
#ifdef TCCBOOT
/* Add -DTCCBOOT to EXTRA_DEFINES in the bootloader Makefile to
enable building the bootloader to be appended to the end of the
original firmware, dual-booting based on a key-press.
The following two values are filled in by mktccboot.
*/
.word 0 /* Saved entrypoint of original firmware*/
.word 0 /* Location in RAM of the start of our bootloader */
#else
ldr pc, =start_loc /* jump to the main entry point */
.word 0xffff0601 /* Unknown magic */
.word 0x3a726556 /* "Ver:" */
.word 0x31373030 /* "0071" */
.word 0 /* First CRC32 */
.word 0 /* Unknown - always 0 */
.word 0 /* Second CRC32 */
.word 0 /* length of firmware file */
#ifdef LOGIK_DAX
/* Some original firmwares have 0x40 bytes of zeroes here - we
don't know why, but err on the side of caution and include it
here. */
.space 0x40
#endif
#endif
start_loc:
#ifdef BOOTLOADER
#ifdef TCCBOOT
#ifdef LOGIK_DAX
mov r0, #0x80000000
ldr r0, [r0, #0x300] /* Read GPIO A */
tst r0, #0x2
ldrne pc, [pc, #-28] /* Jump to original firmware if HOLD button not pressed */
#else
#error No bootup key detection implemented for this target
#endif
/* Copy bootloader to safe area - 0x21000000 (DRAM) */
/* TODO: Adjust this for other targets - DRAM + DRAMSIZE - 0x100000 */
ldr r0, [pc, #-28]
mov r1, #0x20000000
add r1, r1, #0x100000
ldr r2, =_dataend
1:
cmp r2, r1
ldrhi r3, [r0], #4
strhi r3, [r1], #4
bhi 1b
ldr pc, =copied_start /* jump to the relocated start_loc: */
copied_start:
#endif
#else
/* We don't use interrupts in the bootloader */
/* Set up stack for IRQ mode */
mov r0,#0xd2
msr cpsr, r0
ldr sp, =irq_stack
/* Set up stack for FIQ mode */
mov r0,#0xd1
msr cpsr, r0
ldr sp, =fiq_stack
/* Let abort and undefined modes use IRQ stack */
mov r0,#0xd7
msr cpsr, r0
ldr sp, =irq_stack
mov r0,#0xdb
msr cpsr, r0
ldr sp, =irq_stack
#endif
/* Switch to supervisor mode */
mov r0,#0xd3
msr cpsr, r0
ldr sp, =stackend
/* Initialise bss section to zero */
ldr r2, =_edata
ldr r3, =_end
mov r4, #0
1:
cmp r3, r2
strhi r4, [r2], #4
bhi 1b
/* Set up some stack and munge it with 0xdeadbeef */
ldr sp, =stackend
mov r3, sp
ldr r2, =stackbegin
ldr r4, =0xdeadbeef
1:
cmp r3, r2
strhi r4, [r2], #4
bhi 1b
bl main
/* main() should never return */
#ifndef BOOTLOADER
/* We don't use interrupts in the bootloader */
/* 256 words of IRQ stack */
.space 256*4
irq_stack:
/* 256 words of FIQ stack */
.space 256*4
fiq_stack:
#endif
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