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ppc: unused memory region too close to current stack pointer

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This avoids a possible overwrite of the (end of) ramdisk by u-boot.
The unused memory region for ppc boot currently starts 1k below the
do_bootm->bootm_start->arch_lmb_reserve stack ptr. This isn't enough since
do_bootm->do_bootm_linux->boot_relocate_fdt calls printf which may
very well use more than 1k stack space.

Signed-off-by: Norbert van Bolhuis <nvbolhuis@aimvalley.nl>
This commit is contained in:
Norbert van Bolhuis 2010-03-19 15:34:25 +01:00 committed by Wolfgang Denk
parent 4b42c9059e
commit 3882d7a5a5
1 changed files with 2 additions and 2 deletions
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4
arch/powerpc/lib/bootm.c
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@ -163,8 +163,8 @@ void arch_lmb_reserve(struct lmb *lmb)
sp = get_sp();
debug ("## Current stack ends at 0x%08lx\n", sp);
/* adjust sp by 1K to be safe */
sp -= 1024;
/* adjust sp by 4K to be safe */
sp -= 4096;
lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + get_effective_memsize() - sp));
return ;