Add config option to disable MTRR initialization.

Some versions of Bochs don't like the MTRR initialization, so add
CONFIG_MTRR_INIT to control whether SeaBIOS will touch the MTRRs.

2 files changed, 7 insertions, 1 deletions

diff --git a/src/Kconfig b/src/Kconfig
index fca73e4..f064b27 100644
--- a/src/Kconfig
+++ b/src/Kconfig
@@ -194,6 +194,12 @@ menu "Hardware support"
         default y
         help
             Support System Management Mode (on emulators).
+    config MTRR_INIT
+        depends on !COREBOOT
+        bool "Initialize MTRRs"
+        default y
+        help
+            Initialize the Memory Type Range Registers (on emulators).
 endmenu
 
 menu "BIOS interfaces"
diff --git a/src/mtrr.c b/src/mtrr.c
index ed239c8..0502c18 100644
--- a/src/mtrr.c
+++ b/src/mtrr.c
@@ -32,7 +32,7 @@
 
 void mtrr_setup(void)
 {
-    if (CONFIG_COREBOOT)
+    if (!CONFIG_MTRR_INIT || CONFIG_COREBOOT)
         return;
 
     u32 eax, ebx, ecx, edx, cpuid_features;