[M] Change in coreboot[master]: mb/google/rex: Update Rex Flash Layout to fit WP_RO within 4MB

[Subrata Banik (Code Review)]

Attention is currently required from: Tarun Tuli, Paul Menzel, Kapil Porwal.

Hello build bot (Jenkins), Tarun Tuli, Kapil Porwal,

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

https://review.coreboot.org/c/coreboot/+/74229

to look at the new patch set (#3).

Change subject: mb/google/rex: Update Rex Flash Layout to fit WP_RO within 4MB
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mb/google/rex: Update Rex Flash Layout to fit WP_RO within 4MB

This patch updates the Rex flash layout to optimize WP_RO to 4MB.

Changes for chromeos.fmd:

SI_BIOS:
     RW_SECTION_A/B: Reduce to 7MB.
     RW_LEGACY: Reduce to 1MB.
     RW_MISC: Increased to 1MB.
     RW_UNUSED: 3MB (reserved)
     WP_RO: Reduce to 4MB

Additionally, ensure RW_SECTION_B region starts at 16MB boundary in the
SPI Flash.

BUG=b:277143384
TEST=Able to build and boot google/rex with FSP release and debug image.

Change-Id: Iccf83b7bb66d0d5503e0ff9e9a819051296c6724
Signed-off-by: Subrata Banik 
---
M src/mainboard/google/rex/chromeos.fmd
1 file changed, 49 insertions(+), 15 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/29/74229/3