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arm926ejs: add nand_spl boot support 

Add CONFIG_PRELOADER/CONFIG_NAND_SPL support for nand booting
to arm926ejs/start.S

This is derived from CONFIG_PRELOADER support in arm1136/start.S

Signed-off-by: John Rigby <jcrigby@gmail.com>
CC: Scott Wood <scottwood@freescale.com>
This commit is contained in:
John Rigby 2010-01-25 23:12:52 -07:00 committed by Scott Wood
parent 15b86c3d6c
commit ef22b50370
1 changed files with 41 additions and 1 deletions
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42
cpu/arm926ejs/start.S
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@ -53,6 +53,27 @@
.globl _start
_start:
b reset
#ifdef CONFIG_PRELOADER
/* No exception handlers in preloader */
ldr pc, _hang
ldr pc, _hang
ldr pc, _hang
ldr pc, _hang
ldr pc, _hang
ldr pc, _hang
ldr pc, _hang
_hang:
.word do_hang
/* pad to 64 byte boundary */
.word 0x12345678
.word 0x12345678
.word 0x12345678
.word 0x12345678
.word 0x12345678
.word 0x12345678
.word 0x12345678
#else
ldr pc, _undefined_instruction
ldr pc, _software_interrupt
ldr pc, _prefetch_abort
@ -76,6 +97,7 @@ _irq:
_fiq:
.word fiq
#endif /* CONFIG_PRELOADER */
.balignl 16,0xdeadbeef
@ -150,7 +172,6 @@ relocate: /* relocate U-Boot to RAM */
ldr r1, _TEXT_BASE /* test if we run from flash or RAM */
cmp r0, r1 /* don't reloc during debug */
beq stack_setup
ldr r2, _armboot_start
ldr r3, _bss_start
sub r2, r3, r2 /* r2 <- size of armboot */
@ -166,11 +187,14 @@ copy_loop:
/* Set up the stack */
stack_setup:
ldr r0, _TEXT_BASE /* upper 128 KiB: relocated uboot */
sub sp, r0, #128 /* leave 32 words for abort-stack */
#ifndef CONFIG_PRELOADER
sub r0, r0, #CONFIG_SYS_MALLOC_LEN /* malloc area */
sub r0, r0, #CONFIG_SYS_GBL_DATA_SIZE /* bdinfo */
#ifdef CONFIG_USE_IRQ
sub r0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ)
#endif
#endif /* CONFIG_PRELOADER */
sub sp, r0, #12 /* leave 3 words for abort-stack */
bic sp, r0, #7 /* 8-byte align stack for ABI compliance */
@ -179,6 +203,7 @@ clear_bss:
ldr r1, _bss_end /* stop here */
mov r2, #0x00000000 /* clear */
#ifndef CONFIG_PRELOADER
clbss_l:str r2, [r0] /* clear loop... */
add r0, r0, #4
cmp r0, r1
@ -186,11 +211,16 @@ clbss_l:str r2, [r0] /* clear loop... */
bl coloured_LED_init
bl red_LED_on
#endif /* CONFIG_PRELOADER */
ldr pc, _start_armboot
_start_armboot:
#ifdef CONFIG_NAND_SPL
.word nand_boot
#else
.word start_armboot
#endif /* CONFIG_NAND_SPL */
/*
@ -231,6 +261,7 @@ cpu_init_crit:
mov pc, lr /* back to my caller */
#endif /* CONFIG_SKIP_LOWLEVEL_INIT */
#ifndef CONFIG_PRELOADER
/*
*************************************************************************
*
@ -332,10 +363,18 @@ cpu_init_crit:
.macro get_fiq_stack @ setup FIQ stack
ldr sp, FIQ_STACK_START
.endm
#endif /* CONFIG_PRELOADER */
/*
* exception handlers
*/
#ifdef CONFIG_PRELOADER
.align 5
do_hang:
ldr sp, _TEXT_BASE /* switch to abort stack */
1:
bl 1b /* hang and never return */
#else /* !CONFIG_PRELOADER */
.align 5
undefined_instruction:
get_bad_stack
@ -398,3 +437,4 @@ fiq:
bl do_fiq
#endif
#endif /* CONFIG_PRELOADER */