Patch merged into coreboot/master: 7176ac7 Remove CACHE_ROM.

the following patch was just integrated into master:
commit 7176ac78e3d7ad16891b4925ce440bf2a90d0131
Author: Vladimir Serbinenko 
Date:   Wed Feb 5 19:46:45 2014 +0100

Remove CACHE_ROM.

With the recent improvement 3d6ffe76f8a505c2dff5d5c6146da3d63dad6e82,
    speedup by CACHE_ROM is reduced a lot.
    On the other hand this makes coreboot run out of MTRRs depending on
    system configuration, hence screwing up I/O access and cache
    coherency in worst cases.

CACHE_ROM requires the user to sanity check their boot output because
    the feature is brittle. The working configuration is dependent on I/O
    hole size, ram size, and chipset. Because of this the current
    implementation can leave a system configured in an inconsistent state
    leading to unexpected results such as poor performance and/or
    inconsistent cache-coherency

Remove this as a buggy feature until we figure out how to do it properly
    if necessary.

Change-Id: I858d78a907bf042fcc21fdf7a2bf899e9f6b591d
    Signed-off-by: Vladimir Serbinenko

See http://review.coreboot.org/5146 for details.

-gerrit