diff options
| author | Dan Lykowski <lykowdk@gmail.com> | 2009-01-15 02:21:27 +0000 |
|---|---|---|
| committer | Peter Stuge <peter@stuge.se> | 2009-01-15 02:21:27 +0000 |
| commit | 0f502c7537707c82e4cea124df53eb76a3ddd807 (patch) | |
| tree | a2794ea6f0148072b40b53fc28d0e9a21d4b92b1 /src/northbridge | |
| parent | 884e1cbeebeefa2d38f95339545781a8c503a46d (diff) | |
amdk8: This patch fixes ram init problems when using the 9W Sempron part.
Trying to read the FIDVID register when the processor does not support FIDVID
control causes a GP Fault. This patch reads the startup FID from a different
MSR. I have verified this patch to work on the dbm690t platform.
Signed-off-by: Dan Lykowski <lykowdk@gmail.com>
Acked-by: Peter Stuge <peter@stuge.se>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3863 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'src/northbridge')
| -rw-r--r-- | src/northbridge/amd/amdk8/raminit_f.c | 24 | ||||
| -rw-r--r-- | src/northbridge/amd/amdk8/raminit_f_dqs.c | 23 |
2 files changed, 37 insertions, 10 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; diff --git a/src/northbridge/amd/amdk8/raminit_f_dqs.c b/src/northbridge/amd/amdk8/raminit_f_dqs.c index e8add87a7e..dc49d4e893 100644 --- a/src/northbridge/amd/amdk8/raminit_f_dqs.c +++ b/src/northbridge/amd/amdk8/raminit_f_dqs.c @@ -432,14 +432,27 @@ static uint16_t get_exact_T1000(unsigned i) /*15*/ 5000, 4000, 3000, 2500, }; - 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 T1000_a[i]; |