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Startup code for ordinary Rockbox.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8006 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Thom Johansen 2005-11-20 01:58:56 +00:00
parent b363b2f934
commit 118144fb0c
2 changed files with 54 additions and 27 deletions
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4
firmware/boot.lds
View file

@ -82,10 +82,10 @@ SECTIONS
. = (DRAMORIG+16*1024*1024);
.bss : {
_bssstart = .;
_edata = .;
*(.bss);
*(.ibss);
_bssend = . ;
_end = .;
}
}
#else

77
firmware/crt0.S
View file

@ -34,18 +34,62 @@ start:
* Copyright (c) 2005, Bernard Leach <leachbj@bouncycastle.org>
*
*/
.equ PP5002_PROC_ID, 0xc4000000
.equ PP5002COP_CTRL, 0xcf004058
.equ PP5020_PROC_ID, 0x60000000
.equ PP5002_PROC_ID, 0xc4000000
.equ PP5002_COP_CTRL, 0xcf004058
.equ PP5020_PROC_ID, 0x60000000
.equ PP5020_COP_CTRL, 0x60007004
start:
#ifndef BOOTLOADER
/* Zero out IBSS */
ldr r2, =_iedata
ldr r3, =_iend
mov r4, #0
1:
cmp r3, r2
strhi r4, [r2], #4
bhi 1b
/* Copy the IRAM */
ldr r2, =_iramcopy
ldr r3, =_iramstart
ldr r4, =_iramend
1:
cmp r4, r3
ldrhi r5, [r2], #4
strhi r5, [r3], #4
bhi 1b
#endif
/* 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
#ifdef BOOTLOADER
/* TODO: the high part of the address is probably dependent on CONFIG_CPU.
Since we tend to use ifdefs for each chipset target
anyway, we might as well just hardcode it here.
*/
/* get the high part of our execute address */
ldr r0, =0xff000000
and r8, pc, r0 @ r8 is used later
#ifdef BOOTLOADER
#if CONFIG_CPU==PP5002
mov r0, #PP5002_PROC_ID
#else
@ -75,15 +119,6 @@ cop_wake_start:
ldr pc, [r0]
1:
/* setup some stack and munge it with 0xdeadbeef */
ldr sp, =_stackend
mov r3, sp
ldr r2, =_stackbegin
ldr r4, =0xdeadbeef
.mungeloop:
str r4, [r2], #4
cmp r2, r3
bne .mungeloop
/* get the high part of our execute address */
ldr r2, =0xffffff00
@ -103,15 +138,6 @@ cop_wake_start:
ldr pc, =start_loc /* jump to the relocated start_loc: */
start_loc:
/* Initialise bss section to zero */
ldr r3, =_bssstart
ldr r1, =_bssend
mov r2, #0x0
1:
cmp r3, r1
strcc r2, [r3], #4
bcc 1b
/* execute the loader - this will load an image to 0x10000000 */
bl main
@ -158,8 +184,9 @@ boot_table:
/* here comes the boot table, don't move its offset */
.space 400
#else
/* TODO: Implement startup code */
/* Non-bootloader startup code */
ldr r0, =main
mov pc, r0
#endif /* BOOTLOADER (iPod) */
#elif CONFIG_CPU == TCC730