diff options
Diffstat (limited to 'src/cpu/k8/earlymtrr.inc')
| -rw-r--r-- | src/cpu/k8/earlymtrr.inc | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/src/cpu/k8/earlymtrr.inc b/src/cpu/k8/earlymtrr.inc index acc917be7d..6f8537d255 100644 --- a/src/cpu/k8/earlymtrr.inc +++ b/src/cpu/k8/earlymtrr.inc @@ -13,6 +13,13 @@ earlymtrr_start: xorl %edx, %edx # movl $fixed_mtrr_msr, %esi +enable_fixed_mtrr_dram_modify: + /* Enable the access to AMD RdDram and WrDram extension bits */ + movl $SYSCFG_MSR, %ecx + rdmsr + orl $SYSCFG_MSR_MtrrFixDramModEn, %eax + wrmsr + clear_fixed_var_mtrr: lodsl (%esi), %eax testl %eax, %eax @@ -25,7 +32,14 @@ clear_fixed_var_mtrr: jmp clear_fixed_var_mtrr clear_fixed_var_mtrr_out: -/* enable memory access for 0 - 1MB using top_mem */ +disable_fixed_mtrr_dram_modify: + /* Disable the access to AMD RdDram and WrDram extension bits */ + movl $SYSCFG_MSR, %ecx + rdmsr + andl $(~SYSCFG_MSR_MtrrFixDramModEn), %eax + wrmsr + + /* enable memory access for 0 - 1MB using top_mem */ movl $TOP_MEM, %ecx xorl %edx, %edx movl $(((CONFIG_LB_MEM_TOPK << 10) + TOP_MEM_MASK) & ~TOP_MEM_MASK) , %eax @@ -72,9 +86,10 @@ enable_mtrr: movl $0x00000800, %eax wrmsr - /* Enable the MTRRs in SYSCFG */ + /* Enable the MTRRs and IORRs in SYSCFG */ movl $SYSCFG_MSR, %ecx rdmsr + /* Don't enable SYSCFG_MSR_MtrrFixDramEn) untill we have done with VGA BIOS */ orl $(SYSCFG_MSR_MtrrVarDramEn), %eax wrmsr |