Stefan Reinauer ([email protected]) just uploaded a new patch set to 
gerrit, which you can find at http://review.coreboot.org/314

-gerrit

commit d1f0250388d73127f4db35d03d2b3753d1e6b552
Author: Stefan Reinauer <[email protected]>
Date:   Fri Oct 21 14:37:52 2011 -0700

    Fix CMOS checksum calculation in libpayload.
    
    Change-Id: I64ea53fa098fbcfc76e0ebd5f049a2ee3d0a1024
    Signed-off-by: Stefan Reinauer <[email protected]>
---
 payloads/libpayload/drivers/options.c |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)

diff --git a/payloads/libpayload/drivers/options.c 
b/payloads/libpayload/drivers/options.c
index fdb4be3..394c792 100644
--- a/payloads/libpayload/drivers/options.c
+++ b/payloads/libpayload/drivers/options.c
@@ -41,7 +41,6 @@ static int options_checksum_valid(void)
        for(i = range_start; i <= range_end; i++) {
                checksum += nvram_read(i);
        }
-       checksum = (~checksum)&0xffff;
 
        checksum_old = ((nvram_read(checksum_location)<<8) | 
nvram_read(checksum_location+1));
 
@@ -59,7 +58,6 @@ void fix_options_checksum(void)
        for(i = range_start; i <= range_end; i++) {
                checksum += nvram_read(i);
        }
-       checksum = (~checksum)&0xffff;
 
        nvram_write((checksum >> 8), checksum_location);
        nvram_write((checksum & 0xff), checksum_location + 1);

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