[S] Change in coreboot[master]: mb/google/skyrim/var/frostflow: Override SPI flash bus speed

[Frank Wu (Code Review)]

Attention is currently required from: Jason Nien, Martin Roth.

Hello Jason Nien, Martin Roth,

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

https://review.coreboot.org/c/coreboot/+/72694

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

Change subject: mb/google/skyrim/var/frostflow: Override SPI flash bus speed
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mb/google/skyrim/var/frostflow: Override SPI flash bus speed

Add configuration to bump up the SPI flash bus speed from 66 MHz to 100
MHz starting the board version of the current phase.

BUG=b:260127676
TEST=Build and boot to OS in Frostflow with 100 MHz SPI bus speed.
Observe that the boot time improved by 100 ms compared to 66 MHz SPI
flash bus speed.

firmware log:
SPI fast read speed: 100 MHz
At 66 MHz:
Total Time: 1,563,384
At 100 MHz:
Total Time: 1,462,570

Change-Id: I9435f4ad0d3541b040703dc9a453badbd080dc09
Signed-off-by: Frank Wu 
---
M src/mainboard/google/skyrim/Kconfig
1 file changed, 26 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/94/72694/2