[XS] Change in coreboot[main]: nb/intel/sandybridge/raminit: Only write register on IvyBridge

[Patrick Rudolph (Code Review)]

Attention is currently required from: Angel Pons.

Patrick Rudolph has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/79761?usp=email )

Change subject: nb/intel/sandybridge/raminit: Only write register on IvyBridge
......................................................................

nb/intel/sandybridge/raminit: Only write register on IvyBridge

Only write register WMM_READ_CONFIG on Ivy Bridge as it's
reserved on Sandy Bridge.

Tested on Lenovo X220: Still boots and runs fine.

Change-Id: Ie14ea06d744b1a8368d32803c6c1ccfb1262532e
Signed-off-by: Patrick Rudolph 
---
M src/northbridge/intel/sandybridge/raminit_common.c
1 file changed, 2 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/61/79761/1

diff --git a/src/northbridge/intel/sandybridge/raminit_common.c b/src/northbridge/intel/sandybridge/raminit_common.c
index c62e1cd..50c0fb4 100644
--- a/src/northbridge/intel/sandybridge/raminit_common.c
+++ b/src/northbridge/intel/sandybridge/raminit_common.c
@@ -2815,8 +2815,8 @@
    int t3_ns;
    u32 r32;

-	/* FIXME: This register only exists on Ivy Bridge */
-	mchbar_write32(WMM_READ_CONFIG, 0x46);
+	if (IS_IVY_CPU(ctrl->cpu))
+		mchbar_write32(WMM_READ_CONFIG, 0x46);

FOR_ALL_CHANNELS {
    	union tc_othp_reg tc_othp = {