M4A785T-M: Add support for external GFX.

This commit enables the external graphics card.
In order to work, the internal graphic card has to be
  disabled, that is done in src/device/device.c through:
  vga_onboard->ops->disable(vga_onboard);
  which calls the RS780 disable operation introduced in the following
  commit: "rs780: add .disable pcie_ops"

This commit was tested with and without the following card:
  02:00.0 VGA compatible controller: nVidia Corporation GT218 [GeForce 210] (rev a2)

Thanks Aladyshev for the pointer(in the #coreboot IRC channel on Freenode servers):
  Dec 20 19:43:32 <Aladyshev>	If you list your internal card in devicetree.cb,
  coreboot will distinguish external and internal VGA and choose external one

Change-Id: I92e59dffd158db096a6e99d1ef6e2e248fef933c
Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@no-log.org>
Reviewed-on: http://review.coreboot.org/2067
Tested-by: build bot (Jenkins)
Reviewed-by: Dave Frodin <dave.frodin@se-eng.com>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

0 files changed, 0 insertions, 0 deletions