Stefan Reinauer ([email protected]) just uploaded a new patch set to 
gerrit, which you can find at http://review.coreboot.org/1780

-gerrit

commit f40f8bd001eb0222e7536cd63600c47a057a5f09
Author: Stefan Reinauer <[email protected]>
Date:   Mon Oct 15 13:39:00 2012 -0700

    Reduce default stack size to 4K
    
    coreboot uses about 2K of stack on the BSP, and about 1K of stack on the
    APs. No reason to use an overdimensonal stack of 32k per core/thread.
    
    Change-Id: I734c240b992d40e1e35db3df5437c36da0a755cf
    Signed-off-by: Stefan Reinauer <[email protected]>
---
 src/arch/x86/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/arch/x86/Kconfig b/src/arch/x86/Kconfig
index 0233f1e..ec52d0e 100644
--- a/src/arch/x86/Kconfig
+++ b/src/arch/x86/Kconfig
@@ -25,7 +25,7 @@ config RAMTOP
 
 config STACK_SIZE
        hex
-       default 0x8000
+       default 0x1000
 
 # Maximum reboot count
 # TODO: Improve description.

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