diff options
Diffstat (limited to 'src/northbridge/amd/amdk8/raminit_f.c')
-rw-r--r-- | src/northbridge/amd/amdk8/raminit_f.c | 24 |
1 files changed, 19 insertions, 5 deletions
diff --git a/src/northbridge/amd/amdk8/raminit_f.c b/src/northbridge/amd/amdk8/raminit_f.c index a883fa401d..0dcb0f6821 100644 --- a/src/northbridge/amd/amdk8/raminit_f.c +++ b/src/northbridge/amd/amdk8/raminit_f.c @@ -1656,14 +1656,28 @@ static uint8_t get_exact_divisor(int i, uint8_t divisor) /*15*/ 200, 160, 120, 100, }; - unsigned fid_cur; + int index; - msr_t msr; - msr = rdmsr(0xc0010042); - fid_cur = msr.lo & 0x3f; - index = fid_cur>>1; + /* Check for FID control support */ + struct cpuid_result cpuid1; + cpuid1 = cpuid(0x8000007); + if( cpuid1.edx & 0x02 ) { + /* Use current FID */ + unsigned fid_cur; + msr = rdmsr(0xc0010042); + fid_cur = msr.lo & 0x3f; + + index = fid_cur>>1; + } else { + /* Use startup FID */ + unsigned fid_start; + msr = rdmsr(0xc0010015); + fid_start = (msr.lo & (0x3f << 24)); + + index = fid_start>>25; + } if (index>12) return divisor; |