nb/intel/sandybridge/raminit: Only write register on Ivy Bridge
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 <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79761
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
diff --git a/src/northbridge/intel/sandybridge/raminit_common.c b/src/northbridge/intel/sandybridge/raminit_common.c
index d6d545c..fea3ca4 100644
--- a/src/northbridge/intel/sandybridge/raminit_common.c
+++ b/src/northbridge/intel/sandybridge/raminit_common.c
@@ -2809,8 +2809,8 @@
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 = {