[U-Boot] [NEXT PATCH v1 1/7] ARM: Fix start.S when used with SPL in arm1136

Stefano Babic
2012-09-06T08:04:54Z

This patch modifies start.S for the arm1136 to make it
conform to start.S in armv7 architecture, to make it
usable if the SPL framework is used.

Signed-off-by: Stefano Babic <sbabic@denx.de>
---
arch/arm/cpu/arm1136/start.S | 31 ++++++++++++++++++++-----------
1 file changed, 20 insertions(+), 11 deletions(-)

diff --git a/arch/arm/cpu/arm1136/start.S b/arch/arm/cpu/arm1136/start.S
index 3752af9..5d3b4c2 100644
--- a/arch/arm/cpu/arm1136/start.S
+++ b/arch/arm/cpu/arm1136/start.S
@@ -100,6 +100,10 @@ _TEXT_BASE:
_bss_start_ofs:
.word __bss_start - _start

+.global _image_copy_end_ofs
+_image_copy_end_ofs:
+ .word __image_copy_end - _start
+
.globl _bss_end_ofs
_bss_end_ofs:
.word __bss_end__ - _start
@@ -193,7 +197,7 @@ stack_setup:
moveq r9, #0 /* no relocation. relocation offset(r9) = 0 */
beq clear_bss /* skip relocation */
mov r1, r6 /* r1 <- scratch for copy_loop */
- ldr r3, _bss_start_ofs
+ ldr r3, _image_copy_end_ofs
add r2, r0, r3 /* r2 <- source end address */

copy_loop:
@@ -241,15 +245,28 @@ fixnext:
add r2, r2, #8 /* each rel.dyn entry is 8 bytes */
cmp r2, r3
blo fixloop
+ b clear_bss
+
+_rel_dyn_start_ofs:
+ .word __rel_dyn_start - _start
+_rel_dyn_end_ofs:
+ .word __rel_dyn_end - _start
+_dynsym_start_ofs:
+ .word __dynsym_start - _start
#endif

clear_bss:
-#ifndef CONFIG_SPL_BUILD
+#ifdef CONFIG_SPL_BUILD
+ /* No relocation for SPL */
+ ldr r0, =__bss_start
+ ldr r1, =__bss_end__
+#else
ldr r0, _bss_start_ofs
ldr r1, _bss_end_ofs
mov r4, r6 /* reloc addr */
add r0, r0, r4
add r1, r1, r4
+#endif
mov r2, #0x00000000 /* clear */

clbss_l:cmp r0, r1 /* clear loop... */
@@ -258,7 +275,6 @@ clbss_l:cmp r0, r1 /* clear loop... */
add r0, r0, #4
b clbss_l
clbss_e:
-#endif /* #ifndef CONFIG_SPL_BUILD */

/*
* We are done. Do not return, instead branch to second part of board
@@ -273,7 +289,7 @@ _nand_boot_ofs:
#else
jump_2_ram:
ldr r0, _board_init_r_ofs
- ldr r1, _TEXT_BASE
+ adr r1, _start
add lr, r0, r1
add lr, lr, r9
/* setup parameters for board_init_r */
@@ -286,13 +302,6 @@ _board_init_r_ofs:
.word board_init_r - _start
#endif

-_rel_dyn_start_ofs:
- .word __rel_dyn_start - _start
-_rel_dyn_end_ofs:
- .word __rel_dyn_end - _start
-_dynsym_start_ofs:
- .word __dynsym_start - _start
-
/*
*************************************************************************
*
--
1.7.9.5