Patch merged into coreboot/master: a09760e libpayload: add x86 ROM variable MTRR support

the following patch was just integrated into master:
commit a09760eb451466c7972614ef9d73752e16a1bf69
Author: Aaron Durbin 
Date:   Tue Mar 26 13:34:37 2013 -0500

libpayload: add x86 ROM variable MTRR support

On x86, coreboot may allocate a variable range MTRR for enabling caching
    of the system ROM. Add the ability to parse this structure and add the
    result to the sysinfo structure.

An example usage implementation would be to obtain the variable MTRR
    index that covers the ROM from the sysinfo structure. Then one would
    disable caching and change the MTRR type from uncacheable to
    write-protect and enable caching. The opposite sequence is required
    to tearn down the caching.

Change-Id: I3bfe2028d8574d3adb1d85292abf8f1372cf97fa
    Signed-off-by: Aaron Durbin 
    Reviewed-on: http://review.coreboot.org/2920
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer

Build-Tested: build bot (Jenkins) at Fri Mar 29 15:02:19 2013, giving +1
Reviewed-By: Stefan Reinauer  at Fri Mar 29 20:10:14 2013, giving +2
See http://review.coreboot.org/2920 for details.

-gerrit