From f3aa4707d3bef9f529a70a204dbc648968cf7c20 Mon Sep 17 00:00:00 2001
From: Eric Biederman <ebiederm@xmission.com>
Date: Thu, 21 Oct 2004 02:53:25 +0000
Subject: - Explicitly disable the fixed dram extensions bits.

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1697 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
---
 src/cpu/amd/mtrr/amd_mtrr.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src/cpu/amd/mtrr/amd_mtrr.c')

diff --git a/src/cpu/amd/mtrr/amd_mtrr.c b/src/cpu/amd/mtrr/amd_mtrr.c
index 7c8d50ae68..ab6bc2bbee 100644
--- a/src/cpu/amd/mtrr/amd_mtrr.c
+++ b/src/cpu/amd/mtrr/amd_mtrr.c
@@ -24,6 +24,11 @@ void amd_setup_mtrrs(void)
 	device_t dev;
 	msr_t msr;
 
+	/* Disable the access to AMD RdDram and WrDram extension bits */
+	msr = rdmsr(SYSCFG_MSR);
+	msr.lo &= ~SYSCFG_MSR_MtrrFixDramModEn;
+	wrmsr(SYSCFG_MSR, msr);
+
 	x86_setup_mtrrs();
 
 	/* Except for the PCI MMIO hole just before 4GB there are no
-- 
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