diff options
Diffstat (limited to 'src/cpu/k8/earlymtrr.c')
| -rw-r--r-- | src/cpu/k8/earlymtrr.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/src/cpu/k8/earlymtrr.c b/src/cpu/k8/earlymtrr.c index 5fb63d2e7d..2138e3fefe 100644 --- a/src/cpu/k8/earlymtrr.c +++ b/src/cpu/k8/earlymtrr.c @@ -27,13 +27,24 @@ static void early_mtrr_init(void) msr_t msr; const unsigned long *msr_addr; + /* Enable the access to AMD RdDram and WrDram extension bits */ + msr = rdmsr(SYSCFG_MSR); + msr.lo |= SYSCFG_MSR_MtrrFixDramModEn; + wrmsr(msr); + /* Inialize all of the relevant msrs to 0 */ msr.lo = 0; msr.hi = 0; - for(msr_addr = mtrr_msrs; *msr_addr; msr_addr++) { + + for (msr_addr = mtrr_msrs; *msr_addr; msr_addr++) { wrmsr(*msr_addr, msr); } + /* Disable the access to AMD RdDram and WrDram extension bits */ + msr = rdmsr(SYSCFG_MSR); + msr.lo &= ~SYSCFG_MSR_MtrrFixDramModEn; + wrmsr(msr); + /* Enable memory access for 0 - 1MB using top_mem */ msr.hi = 0; msr.lo = ((CONFIG_LB_MEM_TOPK << 10) + TOP_MEM_MASK) & ~TOP_MEM_MASK; |