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-rw-r--r--src/cpu/intel/car/cache_as_ram_ht.inc9
1 files changed, 6 insertions, 3 deletions
diff --git a/src/cpu/intel/car/cache_as_ram_ht.inc b/src/cpu/intel/car/cache_as_ram_ht.inc
index 08f5b1138d..ed207db7b1 100644
--- a/src/cpu/intel/car/cache_as_ram_ht.inc
+++ b/src/cpu/intel/car/cache_as_ram_ht.inc
@@ -25,6 +25,9 @@
#define CPU_MAXPHYADDR 36
#define CPU_PHYSMASK_HI (1 << (CPU_MAXPHYADDR - 32) - 1)
+/* Base address to cache all of Flash ROM, just below 4GB. */
+#define CACHE_ROM_BASE ((1<<22 - CONFIG_CACHE_ROM_SIZE>>10)<<10)
+
#define CACHE_AS_RAM_SIZE CONFIG_DCACHE_RAM_SIZE
#define CACHE_AS_RAM_BASE CONFIG_DCACHE_RAM_BASE
@@ -203,13 +206,13 @@ clear_mtrrs:
movl $CPU_PHYSMASK_HI, %edx
wrmsr
- /* Enable caching and Speculative Reads for the last 4MB. */
+ /* Enable caching and Speculative Reads for Flash ROM device. */
movl $MTRRphysBase_MSR(1), %ecx
- movl $(0xffc00000 | MTRR_TYPE_WRPROT), %eax
+ movl $(CACHE_ROM_BASE | MTRR_TYPE_WRPROT), %eax
xorl %edx, %edx
wrmsr
movl $MTRRphysMask_MSR(1), %ecx
- movl $(~(4 * 1024 * 1024 - 1) | MTRRphysMaskValid), %eax
+ movl $(~(CONFIG_CACHE_ROM_SIZE - 1) | MTRRphysMaskValid), %eax
movl $CPU_PHYSMASK_HI, %edx
wrmsr