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arm926ejs: 8-byte align stack to avoid LDRD/STRD problems

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U-boot for Marvell Kirkwood boards no longer work after the EABI changes
introduced in commit f772acf8a5. 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).

Tested on an OpenRD base board, where both printouts and ubifs stuff now
works.

Signed-off-by: Simon Kagstrom <simon.kagstrom@netinsight.net>
This commit is contained in:
Simon Kagstrom 2009-10-06 08:44:22 +02:00 • committed by Tom Rix
parent e63e5904b4
commit 8003c361de
1 changed files with 1 additions and 0 deletions
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cpu/arm926ejs/start.S
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@ -172,6 +172,7 @@ stack_setup:
sub r0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ)
#endif
sub sp, r0, #12 /* leave 3 words for abort-stack */
bic sp, r0, #7 /* 8-byte align stack for ABI compliance */
clear_bss:
ldr r0, _bss_start /* find start of bss segment */