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-rw-r--r--src/cpu/amd/mtrr/amd_mtrr.c5
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();