[coreboot-gerrit] Patch merged into coreboot/master: x86: add standalone verstage support

[gerrit at coreboot.org]

the following patch was just integrated into master:
commit 75c51d9af15dfc599adaf7a8f6e892d452146f9c
Author: Aaron Durbin <adurbin at chromium.org>
Date:   Tue Sep 29 16:31:20 2015 -0500

    x86: add standalone verstage support
    
    To support x86 verstage one needs a working buffer for
    vboot. That buffer resides in the cache-as-ram region
    which persists across verstage and romstage. The current
    assumption is that verstage brings cache-as-ram up
    and romstage tears cache-as-ram down. The timestamp,
    cbmem console, and the vboot work buffer are persistent
    through in both romstage and verstage. The vboot
    work buffer as well as the cbmem console are permanently
    destroyed once cache-as-ram is torn down. The timestamp
    region is migrated. When verstage is enabled the assumption
    is that _start is the romstage entry point. It's currently
    expected that the chipset provides the entry point to
    romstage when verstage is employed. Also, the car_var_*()
    APIs use direct access when in verstage since its expected
    verstage does not tear down cache-as-ram. Lastly, supporting
    files were added to verstage-y such that an x86 verstage
    will build and link.
    
    BUG=chrome-os-partner:44827
    BRANCH=None
    TEST=Built and booted glados using separate verstage.
    
    Change-Id: I097aa0b92f3bb95275205a3fd8b21362c67b97aa
    Signed-off-by: Aaron Durbin <adurbin at chromium.org>
    Reviewed-on: http://review.coreboot.org/11822
    Tested-by: build bot (Jenkins)
    Reviewed-by: Patrick Georgi <pgeorgi at google.com>


See http://review.coreboot.org/11822 for details.

-gerrit