Tristan Corrick uploaded patch set #3 to this change.

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nb/intel/haswell/gma: Support boards that have DDI E connected

On an ASRock H81M-HDS neither libgfxinit, nor Linux, is able to
initialise the display when lanes are not configured to be shared
between DDI A and DDI E.

Intel's reference manual [1] states that the decision to share lanes
between DDI A and DDI E is "based on board configuration". Hence, add a
new field to the devicetree that boards can set. All existing Haswell
boards have this unset, thus taking a value of 0, so there is no change
to existing behaviour.

[1]: Intel Open Source Graphics Programmer's Reference Manual (PRM)
Volume 2c: Command Reference: Registers (Haswell)

Change-Id: I6f7832293215d2b53e31b0a5c985e6098eb72f1b
Signed-off-by: Tristan Corrick <>
M src/northbridge/intel/haswell/chip.h
M src/northbridge/intel/haswell/gma.c
2 files changed, 6 insertions(+), 1 deletion(-)

git pull ssh:// refs/changes/85/29385/3

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Gerrit-Project: coreboot
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I6f7832293215d2b53e31b0a5c985e6098eb72f1b
Gerrit-Change-Number: 29385
Gerrit-PatchSet: 3
Gerrit-Owner: Tristan Corrick <>
Gerrit-Reviewer: Nico Huber <>
Gerrit-Reviewer: Tristan Corrick <>
Gerrit-Reviewer: build bot (Jenkins) <>