[S] Change in coreboot[master]: soc/intel/xeon_sp/spr: Add RMT config

[Felix Held (Code Review)]

Felix Held has submitted this change. ( https://review.coreboot.org/c/coreboot/+/75416?usp=email )

Change subject: soc/intel/xeon_sp/spr: Add RMT config
......................................................................

soc/intel/xeon_sp/spr: Add RMT config

This commit adds a configuration option to enable RMT in the coreboot
build for the Intel Xeon SP SPR platform.

Signed-off-by: Naresh Solanki 
Change-Id: I9b9276116c22cfbbec132d7a1b0026a52a51398a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75416
Tested-by: build bot (Jenkins) 
Reviewed-by: Lean Sheng Tan 
Reviewed-by: Felix Singer 
---
M src/soc/intel/xeon_sp/spr/Kconfig
M src/soc/intel/xeon_sp/spr/romstage.c
2 files changed, 13 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Lean Sheng Tan: Looks good to me, approved
  Felix Singer: Looks good to me, approved

diff --git a/src/soc/intel/xeon_sp/spr/Kconfig b/src/soc/intel/xeon_sp/spr/Kconfig
index 308ec2d..f666ab5 100644
--- a/src/soc/intel/xeon_sp/spr/Kconfig
+++ b/src/soc/intel/xeon_sp/spr/Kconfig
@@ -182,4 +182,10 @@
      ASPM. This option is intended for debugging and validation and
      should normally be disabled.

+config ENABLE_RMT
+	bool "Enable RMT"
+	default n
+	help
+	  Enable Rank Margining Tool. This option is intended for debugging and
+	  validation and should normally be disabled.
 endif
diff --git a/src/soc/intel/xeon_sp/spr/romstage.c b/src/soc/intel/xeon_sp/spr/romstage.c
index 8f4e98e..fef4d94 100644
--- a/src/soc/intel/xeon_sp/spr/romstage.c
+++ b/src/soc/intel/xeon_sp/spr/romstage.c
@@ -217,6 +217,13 @@
    	mupd->FspmConfig.KtiLinkL1En = 0;
    	mupd->FspmConfig.KtiLinkL0pEn = 0;
    }
+
+	if (CONFIG(ENABLE_RMT)) {
+		printk(BIOS_INFO, "RMT Enabled.\n");
+		mupd->FspmConfig.EnableRMT = 0x1;
+		/* Set FSP debug message to Max for RMT logs */
+		mupd->FspmConfig.serialDebugMsgLvl = 0x3;
+	}
 }

static uint8_t get_error_correction_type(const uint8_t RasModesEnabled)