Am Montag 05 Oktober 2009 16:53:24 schrieb Simon Kagstrom:
Hi all,
congratulation and many thanks for the catch :)
Dieter
U-boot for Marvell Kirkwood boards no longer work after the EABI changes introduced in commit f772acf8a584067033eff1e231fcd1fb3a00d3d9. This turns out to be caused by a stack alignment issue. The armv5te instructions ldrd/strd instructions require 8-byte alignment to work properly (otherwise undefined behavior), and start.S gave the stack a 12-byte alignment.
Tested on an OpenRD base board, where both printouts and ubifs stuff now works.
Signed-off-by: Simon Kagstrom simon.kagstrom@netinsight.net
ChangeLog: v2: Update after Andrews comments
- Mask away the low address bits to get 16-byte alignment
cpu/arm926ejs/start.S | 5 ++++- 1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/cpu/arm926ejs/start.S b/cpu/arm926ejs/start.S index 8043322..cd3a6bd 100644 --- a/cpu/arm926ejs/start.S +++ b/cpu/arm926ejs/start.S @@ -171,7 +171,10 @@ stack_setup: #ifdef CONFIG_USE_IRQ sub r0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ) #endif
- sub sp, r0, #12 /* leave 3 words for abort-stack */
- sub r0, r0, #12 /* leave 3 words for abort-stack and */
- mov r1, #7 /* 8-byte align stack for ldrd/strd */
- and r1, r0
- sub sp, r0, r1
clear_bss: ldr r0, _bss_start /* find start of bss segment */