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authorSubrata Banik <subrata.banik@intel.com>2019-11-25 11:57:28 +0530
committerSubrata Banik <subrata.banik@intel.com>2019-11-26 11:55:10 +0000
commit24ab1c5db6a48f27d1541f8f356127a14111358e (patch)
treec063631796d2955bd3821802fb2cf457b12e6574 /src/soc/intel/apollolake
parent0d2dbcab5f08329567c2acbf54bcb7bd9ad5a8f6 (diff)
downloadcoreboot-24ab1c5db6a48f27d1541f8f356127a14111358e.tar.xz
soc/intel/{apl,cnl,dnv,skl}: Skip ucode loading by FSP-T
It is a requirement for Firmware to have Firmware Interface Table (FIT), which contains pointers to each microcode update. The microcode update is loaded for all logical processors before reset vector. FSPT_UPD.MicrocodeRegionBase and FSPT_UPD.MicrocodeRegionLength are input parameters to TempRamInit API. If these values are 0, FSP will not attempt to update microcode. Since Gen-4 all IA-SoC has FIT loading ucode even before cpu reset in place hence skipping FSP-T loading ucode after CPU reset options. Also removed unused kconfig CONFIG_CPU_MICROCODE_CBFS_LOC and CONFIG_CPU_MICROCODE_CBFS_LEN Change-Id: I3a406fa0e2e62e3363c2960e173dc5f5f5ca0455 Signed-off-by: Subrata Banik <subrata.banik@intel.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/37187 Reviewed-by: Arthur Heymans <arthur@aheymans.xyz> Reviewed-by: David Guckian Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/soc/intel/apollolake')
-rw-r--r--src/soc/intel/apollolake/fspcar.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/src/soc/intel/apollolake/fspcar.c b/src/soc/intel/apollolake/fspcar.c
index 8b1089f397..a284116bac 100644
--- a/src/soc/intel/apollolake/fspcar.c
+++ b/src/soc/intel/apollolake/fspcar.c
@@ -25,6 +25,17 @@ const FSPT_UPD temp_ram_init_params = {
.FsptCommonUpd = {
.Revision = 0,
.Reserved = {0},
+ /*
+ * It is a requirement for firmware to have Firmware Interface Table
+ * (FIT), which contains pointers to each microcode update.
+ * The microcode update is loaded for all logical processors before
+ * cpu reset vector.
+ *
+ * All SoC since Gen-4 has above mechanism in place to load microcode
+ * even before hitting CPU reset vector. Hence skipping FSP-T loading
+ * microcode after CPU reset by passing '0' value to
+ * FSPT_UPD.MicrocodeRegionBase and FSPT_UPD.MicrocodeRegionLength.
+ */
.MicrocodeRegionBase = 0,
.MicrocodeRegionLength = 0,
.CodeRegionBase =