[coreboot] Patch merged into coreboot/master: 07e941b Fix MRC cache update delays

the following patch was just integrated into master:
commit 07e941bfd3b775f6f3f03768d886a6b735d73d2d
Author: Stefan Reinauer 
Date:   Wed Jun 6 13:24:32 2012 -0700

Fix MRC cache update delays

When no valid MRC cache area is found, the mrc_cache data structure
    was used without prior initialization. This sometimes caused a long
    delay when booting because compute_ip_checksum would checksum up to
    4GB of memory.

Change-Id: I6a0ca1aa618838bbc3d042be425700fc34b427f2
    Signed-off-by: Stefan Reinauer

Build-Tested: build bot (Jenkins) at Tue Jul 24 03:31:15 2012, giving +1
Reviewed-By: Ronald G. Minnich  at Tue Jul 24 06:55:35 2012, giving +2
See http://review.coreboot.org/1277 for details.

-gerrit