cpu/intel/sandybridge: Put stage cache into TSEG
TSEG is not accessible in ring 0 after it is locked in ramstage, in
contrast with cbmem which remains accessible. Assuming SMM does not
touch the cache this is a good region to cache stages.
The code is mostly copied from src/cpu/intel/haswell.
TESTED on Thinkpad X220: on a cold boot the stage cache gets created
and on S3 the cached ramstage gets properly used.
Change-Id: Ifd8f939416b1712f6e5c74f544a5828745f8c2f2
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/23592
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
diff --git a/src/northbridge/intel/sandybridge/sandybridge.h b/src/northbridge/intel/sandybridge/sandybridge.h
index a3b4faa..46ebfc3 100644
--- a/src/northbridge/intel/sandybridge/sandybridge.h
+++ b/src/northbridge/intel/sandybridge/sandybridge.h
@@ -40,7 +40,8 @@
#define IVB_STEP_D0 (BASE_REV_IVB + 6)
/* Intel Enhanced Debug region must be 4MB */
-#define IED_SIZE 0x400000
+
+#define IED_SIZE CONFIG_IED_REGION_SIZE
/* Northbridge BARs */
#define DEFAULT_PCIEXBAR CONFIG_MMCONF_BASE_ADDRESS /* 4 KB per PCIe device */