[coreboot-gerrit] Patch merged into coreboot/master: gm45: enable setting all vram sizes from cmos

the following patch was just integrated into master:
commit 7afcfe0f9f78ef8d5029e90304a34caf07d14588
Author: Arthur Heymans 
Date:   Thu May 19 15:34:49 2016 +0200

gm45: enable setting all vram sizes from cmos

Setting the size of the preallocated memory for the igd is done
    using a cmos parameter, gfx_uma_size. This was limited to a subset of
    all available sizes, that were already implemented elsewhere
    in the northbridge code.

What this does is change the cmos parameter to 4 bits instead
    of 3 bits to accomodate all vram sizes.
    It also adds a sane default of 32mb that already was in place.
    The northbridge code that reads this cmos parameter is
    also changed for this new cmos settings.

352M is disabled since it causes issues on systems with 4GB or more ram.

TEST: Build, flash target. Clear cmos by corrupting
    the checksum (nvramtool -c something).
    Set a desired value in gfx_uma_size using nvramtool.
    "dmesg | grep stolen" to see what is actually allocated.

Change-Id: Ia6479d03f1abe6d0c94bd7264365505e8f8eaeec
    Signed-off-by: Arthur Heymans 
    Reviewed-on: https://review.coreboot.org/14900
    Tested-by: build bot (Jenkins)
    Reviewed-by: Patrick Rudolph

See https://review.coreboot.org/14900 for details.

-gerrit