Gaggery Tsai has uploaded this change for review.

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soc/intel/common/block/cpu/car: Enable caching before FSP-T

This patch is required for Boot Guard enabled platform. Enable caching
before entering FSP-T.

TEST=Stitch boot guard ACM with signed KM and BPM &&
Enable FSP-T and boot all the way to the OS &&
Read MSR 0x13a and esnure boot guard verified boot and
measured boot are enabled.

Change-Id: Ie1def754f7b0024725638fcea481fd3273ef3d24
M src/soc/intel/common/block/cpu/car/cache_as_ram_fsp.S
1 file changed, 6 insertions(+), 0 deletions(-)

git pull ssh:// refs/changes/52/38252/1
diff --git a/src/soc/intel/common/block/cpu/car/cache_as_ram_fsp.S b/src/soc/intel/common/block/cpu/car/cache_as_ram_fsp.S
index 091fc4a..fd22903 100644
--- a/src/soc/intel/common/block/cpu/car/cache_as_ram_fsp.S
+++ b/src/soc/intel/common/block/cpu/car/cache_as_ram_fsp.S
@@ -35,6 +35,12 @@

+ /* Enable caching */
+ mov %cr0, %eax
+ and $~(CR0_CD | CR0_NW), %eax
+ invd
+ mov %eax, %cr0
/* find fsp in cbfs */
lea fsp_name, %esi
mov $1f, %esp

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Gerrit-Project: coreboot
Gerrit-Branch: master
Gerrit-Change-Id: Ie1def754f7b0024725638fcea481fd3273ef3d24
Gerrit-Change-Number: 38252
Gerrit-PatchSet: 1
Gerrit-Owner: Gaggery Tsai <>
Gerrit-MessageType: newchange