Patch merged into coreboot/master: nb/intel/sandybridge: increase MMCONF_BASE_ADDRESS

the following patch was just integrated into master:
commit 5c10abeb734d8adee217bc5ed1edcb042064d239
Author: Patrick Rudolph 
Date:   Tue Mar 15 07:44:49 2016 +0100

nb/intel/sandybridge: increase MMCONF_BASE_ADDRESS

Set MMCONF_BASE_ADDRESS to 0xf8000000.
    It was already done for some boards, but not all.

The sandybridge chipset code assumes 64 pci buses behind MMCONF.
    Therefore, only 64MiB of physical address space is required.

Increasing the address allows to use additional 128MiB of MMIO
    space and to use the Intel IGD and a PEG at the same time.

Previously it wasn't possible to use both at the same time,
    as two 256MiB areas won't fit into MMIO space.

Test system:
     * Gigabyte GA-B75M-D3H
     * Intel Pentium CPU G2130
     * Onboard GPU Intel IvyBridge Desktop
     * PEG GPU AMD RV770

Change-Id: I3bf72439056c8089ada6899bb0605e5cd9d89cd6
    Signed-off-by: Patrick Rudolph 
    Reviewed-on: https://review.coreboot.org/14096
    Tested-by: build bot (Jenkins)
    Reviewed-by: Aaron Durbin 
    Reviewed-by: Philipp Deppenwiese

See https://review.coreboot.org/14096 for details.

-gerrit