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-rw-r--r--src/cpu/amd/mtrr/amd_mtrr.c5
1 files changed, 5 insertions, 0 deletions
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