- Explicitly disable the fixed dram extensions bits.

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1697 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
2004-10-21 02:53:25 +00:00 · 2004-10-21 02:53:25 +00:00 · f3aa4707d3
parent 29490a17ce
commit f3aa4707d3
1 changed files with 5 additions and 0 deletions
--- 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