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

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

The idea is to create more space inside FW_RW_A/B to accommodate
multiple blobs to boot google/rex with different Intel MTL SoC stepping.

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 <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74229
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

0 files changed, 0 insertions, 0 deletions