Patch merged into coreboot/master: 716738a x86: add cache-as-ram migration option

the following patch was just integrated into master:
commit 716738a6b84535f731ee9749f161505945eab93c
Author: Aaron Durbin 
Date:   Fri May 10 00:33:32 2013 -0500

x86: add cache-as-ram migration option

There are some boards that do a significant amount of
    work after cache-as-ram is torn down but before ramstage
    is loaded. For example, using vboot to verify the ramstage
    is one such operation. However, there are pieces of code
    that are executed that reference global variables that
    are linked in the cache-as-ram region. If those variables
    are referenced after cache-as-ram is torn down then the
    values observed will most likely be incorrect.

Therefore provide a Kconfig option to select cache-as-ram
    migration to memory using cbmem. This option is named
    CAR_MIGRATION. When enabled, the address of cache-as-ram
    variables may be obtained dynamically. Additionally,
    when cache-as-ram migration occurs the cache-as-ram
    data region for global variables is copied into cbmem.
    There are also automatic callbacks for other modules
    to perform their own migration, if necessary.

Change-Id: I2e77219647c2bd2b1aa845b262be3b2543f1fcb7
    Signed-off-by: Aaron Durbin 
    Reviewed-on: http://review.coreboot.org/3232
    Reviewed-by: Paul Menzel 
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer

See http://review.coreboot.org/3232 for details.

-gerrit