On modern mainboards with multiple PCI-e devices and a single graphics card the default MMIO hole size of 512M is inadequate, leading to resource-hungry PCI-e devices (such as an external graphics card) being assigned invalid MMIO ranges. This, in turn, causes the entire PCI subsystem to become unavailable, leading to a failure to boot. TEST: Booted KGPE-D16 with NVIDIA 7300LE and verified proper operation of PCI/PCI-e devices, including text mode VGA operation via the add-on card and its VGA option ROM. Change-Id: I8d25f4b19f2d0860644ab1ee002c15041437121f Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com> Reviewed-on: http://review.coreboot.org/10428 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com> Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>