[XS] Change in coreboot[master]: soc/mediatek: Enable scramble feature support on fast-k flow

[Xixi Chen (Code Review)]

Xixi Chen has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/75818?usp=email )

Change subject: soc/mediatek: Enable scramble feature support on fast-k flow
......................................................................

soc/mediatek: Enable scramble feature support on fast-k flow

Originally, scramble feature is only enabled on full-k. For fast-k
flow, needs to add the header config DRAMC_CONFIG_SCRAMBLE.

BUG=b:285474337
TEST=Check the scramble feature is disabled on serial build

Signed-off-by: Xi Chen 
Change-Id: I907bccd4e68e040179e1971db6bf7a57b88dec1b
---
M src/soc/mediatek/common/Kconfig
M src/soc/mediatek/common/memory.c
2 files changed, 3 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/18/75818/1

diff --git a/src/soc/mediatek/common/Kconfig b/src/soc/mediatek/common/Kconfig
index 8092aa7..348b9a5 100644
--- a/src/soc/mediatek/common/Kconfig
+++ b/src/soc/mediatek/common/Kconfig
@@ -32,7 +32,7 @@

config MEDIATEK_DRAM_SCRAMBLE
    bool "Enable DRAM scramble feature"
-	default n
+	default y
    help
      This option enables DRAM data scramble, which can prevent DRAM data from
      being hacked.
diff --git a/src/soc/mediatek/common/memory.c b/src/soc/mediatek/common/memory.c
index b6f7dde..1a627dd 100644
--- a/src/soc/mediatek/common/memory.c
+++ b/src/soc/mediatek/common/memory.c
@@ -202,6 +202,8 @@

printk(BIOS_INFO, "DRAM-K: DRAM calibration data valid pass\n");

+	if (CONFIG(MEDIATEK_DRAM_SCRAMBLE))
+		dparam->header.config |= DRAMC_CONFIG_SCRAMBLE;
    if (CONFIG(MEDIATEK_DRAM_BLOB_FAST_INIT)) {
    	printk(BIOS_INFO, "DRAM-K: Run fast calibration run in blob mode\n");