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