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nb/intel/sandybridge/raminit: Only write register on Ivy Bridge

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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>
This commit is contained in:
Patrick Rudolph 2023-12-21 14:49:36 +01:00 committed by Felix Held
parent d81324eb74
commit 220bd26b6e
1 changed files with 2 additions and 2 deletions
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4
src/northbridge/intel/sandybridge/raminit_common.c
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@ -2809,8 +2809,8 @@ void final_registers(ramctr_timing *ctrl)
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 = {