mb/purism/librem_cnl: Use FMAP-based SPD cache

Use a FMAP region to cache SPD data, providing improvements in boot
time and detection of change in DIMM population (which FSP will
sometimes fail to detect / fail to invalidate the MRC cache).

Adapted from implementation used in google/hatch.

Test: build/boot Librem Mini v2, verify SPD cache used, changes
in DIMM population properly detected.

Change-Id: I15cb9aa8b00d39d098a0f901aee026bac1161a80
Signed-off-by: Matt DeVillier <matt.devillier@puri.sm>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48549
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

0 files changed, 0 insertions, 0 deletions