/*************************************************************************** * __________ __ ___. * 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 * */ #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. NB: On the D2 TCCBOOT currently only works in USB boot mode (via tcctool) When flashed to the device, the OF will boot as normal - but holding a key to boot Rockbox results in a blank screen and crashed player. 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 COWON_D2 /* 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 COWON_D2 ldr r0, =0xf005a000 ldr r0, [r0, #0x40] /* Read GPIO B */ tst r0, #0x4 ldreq pc, [pc, #-28] /* Jump to original firmware if keypad 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, #0x22000000 sub 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 /* Enable MMU & caches. At present this is just doing what the OF does. Ensure TCMs are enabled before copying the exception vectors to 0x0. */ mov r1, #0xf7000000 /* Virtual MMU Table base */ ldr r0, =0x1fe0c /* Region 0: 0x00000000-0xffffffff (4Gb) */ str r0, [r1] /* AP: 3 EN: 1 DO: 0 CACHE_ALL */ ldr r0, =0x2801ae24 /* Region 1: 0x28000000-0x2fffffff (128Mb) */ str r0, [r1,#4] /* AP: 3 EN: 1 DO: 1 BUFFERED */ ldr r0, =0x13e44 /* Region 2: 0x00000000-0x000fffff (1Mb) */ str r0, [r1,#8] /* AP: 3 EN: 1 DO: 2 BUFFERED */ ldr r0, =0x4001ce60 /* Region 3: 0x40000000-0x5fffffff (512Mb) */ str r0, [r1,#0xc] /* AP: 3 EN: 1 DO: 3 CACHE_NONE */ ldr r0, =0x6001be80 /* Region 4: 0x60000000-0x6fffffff (256Mb) */ str r0, [r1,#0x10] /* AP: 3 EN: 1 DO: 4 CACHE_NONE */ ldr r0, =0x3801aea4 /* Region 5: 0x38000000-0x3fffffff (128Mb) */ str r0, [r1,#0x14] /* AP: 3 EN: 1 DO: 5 BUFFERED */ ldr r0, =0x8001eec0 /* Region 6: 0x80000000-0xffffffff (2Gb) */ str r0, [r1,#0x18] /* AP: 3 EN: 1 DO: 6 CACHE_NONE */ ldr r0, =0x1001aee0 /* Region 7: 0x10000000-0x17ffffff (128Mb) */ str r0, [r1,#0x1c] /* AP: 3 EN: 1 DO: 7 CACHE_NONE */ add r1, r1, #0x8000 mcr p15, 0, r1, c2, c0, 0 /* Set TTBR = TABBASE (Virtual TLB) */ ldr r0, =0x55555555 mcr p15, 0, r0, c3, c0, 0 /* Domain access d0-d15 = 'client' */ ldr r0, =0xa0000011 mcr p15, 0, r0, c9, c1, 0 /* Data TCM: 0xA0000000-0xA00001fff (8Kb) */ mov r0, #0xd mcr p15, 0, r0, c9, c1, 1 /* Instr. TCM: 0x00000000-0x00000fff (4Kb) */ mov r0, #0 mcr p15, 0, r0, c7, c5, 0 /* Invalidate Icache */ ldr r2, =0x5507d mcr p15, 0, r2, c1, c0, 0 /* Enable MMU, I & D caches */ mcr p15, 0, r0, c7, c6, 0 /* Invalidate Dcache */ mcr p15, 0, r1, c8, c7, 0 /* Invalidate TLB */ #if !defined(BOOTLOADER) && !defined(STUB) /* Copy exception handler code to address 0 */ ldr r2, =_vectorsstart ldr r3, =_vectorsend ldr r4, =_vectorscopy 1: cmp r3, r2 ldrhi r5, [r4], #4 strhi r5, [r2], #4 bhi 1b /* Copy the IRAM (SRAM) */ ldr r2, =_iramcopy ldr r3, =_iramstart ldr r4, =_iramend 1: cmp r4, r3 ldrhi r5, [r2], #4 strhi r5, [r3], #4 bhi 1b /* Zero out IBSS */ ldr r2, =_iedata ldr r3, =_iend mov r4, #0 1: cmp r3, r2 strhi r4, [r2], #4 bhi 1b /* Copy the ITCM */ ldr r2, =_itcmcopy ldr r3, =_itcmstart ldr r4, =_itcmend 1: cmp r4, r3 ldrhi r5, [r2], #4 strhi r5, [r3], #4 bhi 1b /* Copy the DTCM */ ldr r2, =_dtcmcopy ldr r3, =_dtcmstart ldr r4, =_dtcmend 1: cmp r4, r3 ldrhi r5, [r2], #4 strhi r5, [r3], #4 bhi 1b #endif /* !BOOTLOADER,!STUB */ /* 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 /* Exception handlers. Will be copied to address 0 after memory remapping */ .section .vectors,"aw" ldr pc, [pc, #24] ldr pc, [pc, #24] ldr pc, [pc, #24] ldr pc, [pc, #24] ldr pc, [pc, #24] ldr pc, [pc, #24] ldr pc, [pc, #24] ldr pc, [pc, #24] /* Exception vectors */ .global vectors vectors: .word start .word undef_instr_handler .word software_int_handler .word prefetch_abort_handler .word data_abort_handler .word reserved_handler .word irq_handler .word fiq_handler .text #if !defined(STUB) .global irq .global fiq .global UIE #endif /* All illegal exceptions call into UIE with exception address as first parameter. This is calculated differently depending on which exception we're in. Second parameter is exception number, used for a string lookup in UIE. */ undef_instr_handler: mov r0, lr mov r1, #0 b UIE /* We run supervisor mode most of the time, and should never see a software exception being thrown. Perhaps make it illegal and call UIE? */ software_int_handler: reserved_handler: movs pc, lr prefetch_abort_handler: sub r0, lr, #4 mov r1, #1 b UIE data_abort_handler: sub r0, lr, #8 mov r1, #2 b UIE #if defined(STUB) UIE: b UIE #endif /* We don't use interrupts in the bootloader */ /* Align stacks to cache line boundary */ .balign 16 /* 256 words of IRQ stack */ .space 256*4 irq_stack: /* 256 words of FIQ stack */ .space 256*4 fiq_stack: #endif