Change in coreboot[master]: mb/google/dedede/var/metaknight: Set core display clock to 172.8 MHz

[David Wu (Code Review)]

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I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/61327

to look at the new patch set (#2).

Change subject: mb/google/dedede/var/metaknight: Set core display clock to 172.8 MHz
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mb/google/dedede/var/metaknight: Set core display clock to 172.8 MHz

When using the default initial core display clock frequency, Metaknight
has a rare stability issue where the startup of Chrome OS in secure mode
may hang. Slowing the initial core display clock frequency down to
172.8 MHz as per Intel recommendation avoids this problem.

The CdClock=0xff is set in dedede baseboard,and we overwrite it as 0x0
(172.8 MHz) for metaknight.

BUG=None
BRANCH=dedede
TEST=Build firmware and verify on fail DUTs.
     Check the DUTs can boot up in secure mode well.

Change-Id: I987277fec2656fe6f10827bc6685d3d04093235e
Signed-off-by: David Wu 
---
M src/mainboard/google/dedede/variants/metaknight/overridetree.cb
1 file changed, 3 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/27/61327/2