[U-Boot] [PATCH 2/9] arm926ejs: add nand_spl boot support

John Rigby
2010-01-13T04:43:54Z

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>
---
cpu/arm926ejs/start.S | 42 +++++++++++++++++++++++++++++++++++++++++-
1 files changed, 41 insertions(+), 1 deletions(-)

diff --git a/cpu/arm926ejs/start.S b/cpu/arm926ejs/start.S
index 4421b6a..3b81151 100644
--- a/cpu/arm926ejs/start.S
+++ b/cpu/arm926ejs/start.S
@@ -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 */
--
1.6.4.2.236.gf324c