From 3882d7a5a57eb8d1f41570522445bab61c628e6f Mon Sep 17 00:00:00 2001
From: Norbert van Bolhuis <nvbolhuis@aimvalley.nl>
Date: Fri, 19 Mar 2010 15:34:25 +0100
Subject: [PATCH] ppc: unused memory region too close to current stack pointer
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>
---
arch/powerpc/lib/bootm.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/lib/bootm.c b/arch/powerpc/lib/bootm.c
index 0685a9331c..6702df51a5 100644
--- a/arch/powerpc/lib/bootm.c
+++ b/arch/powerpc/lib/bootm.c
@@ -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 ;
--
2.39.5