x4x/gma.c: Add VESA native resolution mode

This patch implements native resolution, VESA mode, on the VGA output of
x4x.

It relies on EDID to modeset, but has a fallback-mode (640 x 480 @
60Hz) if this is no EDID could be found. This fallback mode only works
in textmode since in VESA mode some payloads (grub2) rely on VBE info,
which is being generated from an EDID.

Change-Id: I247ea7171ba3c5dc3b209d00e4dcb2d2069abd75
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/16498
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

0 files changed, 0 insertions, 0 deletions