tree bec707a268e4b03e65234428b03f2637e601e205
parent 04abc869ae32ab3f638620c6f7f1f49d738dacb9
author Subrata Banik <subratabanik@google.com> 1678206862 +0000
committer Subrata Banik <subratabanik@google.com> 1684991012 +0000

mb/google/rex: Enable SaGv

This patch overrides `SaGv` FSP-M UPD to enable SaGv feature to be
able to train memory (DIMM) at different frequencies.

On all latest Intel based platforms SaGv is expected to be enabled
to support dynamic switching of memory operating frequency.

BUG=b:267879107
TEST=Able to verify SaGv is enabled with 3 work point (0, 1 and 2)
and MRC retraining takes around ~20ms extra compared to SaGv being
disabled.

Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: Ic680bfeab4dd285c0d3916ba5e917cc12bae3284
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73534
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Reviewed-by: Sridhar Siricilla <sridhar.siricilla@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>