Marc Jones ([email protected]) just uploaded a new patch set to gerrit, which 
you can find at http://review.coreboot.org/240

-gerrit

commit f58d203a35b5a75feb3a17319a83d41385852a9f
Author: Marc Jones <[email protected]>
Date:   Thu Oct 6 16:38:35 2011 -0600

    Don't do a call as the first instruction in libpayload.
    
    Doing a call before the payload has set up its stack is risky. The stack 
may not be in a favorable location. Normally this is not an issue with coreboot 
or other well behaved callers.
    
    Change-Id: Ie6f6748a471324b29ebad045c807dfc9f4b92034
    Signed-off-by: Marc Jones <[email protected]>
---
 payloads/libpayload/arch/i386/head.S |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/payloads/libpayload/arch/i386/head.S 
b/payloads/libpayload/arch/i386/head.S
index 88db412..3dd6133 100644
--- a/payloads/libpayload/arch/i386/head.S
+++ b/payloads/libpayload/arch/i386/head.S
@@ -38,10 +38,7 @@
  * change anything.
  */
 _entry:
-       call _init
-
-       /* We're back - go back to the bootloader. */
-       ret
+       jmp _init
 
        .align 4
 
@@ -66,6 +63,9 @@ _init:
        /* No interrupts, please. */
        cli
 
+       /* There is a bunch of stuff missing here to take arguments on the stack
+        * See http://www.coreboot.org/Payload_API and exec.S.
+        */
        /* Store current stack pointer. */
        movl %esp, %esi
 

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