diff options
| -rw-r--r-- | src/cpu/amd/mtrr/amd_mtrr.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/src/cpu/amd/mtrr/amd_mtrr.c b/src/cpu/amd/mtrr/amd_mtrr.c index c5e01b137d..54a70e2d91 100644 --- a/src/cpu/amd/mtrr/amd_mtrr.c +++ b/src/cpu/amd/mtrr/amd_mtrr.c @@ -114,12 +114,13 @@ void amd_setup_mtrrs(void) msr_t msr, sys_cfg; // Test if this CPU is a Fam 0Fh rev. F or later const int cpu_id = cpuid_eax(0x80000001); + printk(BIOS_SPEW, "CPU ID 0x80000001: %x\n", cpu_id); const int has_tom2wb = - (((cpu_id>>8 )&0xf) > 0xf) || // Family > 0F + (((cpu_id>>20 )&0xf) > 0) || // ExtendedFamily > 0 ((((cpu_id>>8 )&0xf) == 0xf) && // Family == 0F (((cpu_id>>16)&0xf) >= 0x4)); // Rev>=F deduced from rev tables if(has_tom2wb) - printk(BIOS_DEBUG, "CPU is Fam 0Fh rev.F or later, using TOM2WB instead of MTRR above 4GB\n"); + printk(BIOS_DEBUG, "CPU is Fam 0Fh rev.F or later. We can use TOM2WB for any memory above 4GB\n"); /* Enable the access to AMD RdDram and WrDram extension bits */ disable_cache(); |