With the fact that CSM is not supported,
the request is to remove the cache setting for memory under 1MB.
This can be treated as the missing part of legacy CSM deprecation.

This patch only set the 00000 to 9FFFF and C0000 to FFFFF as Write Back.
A0000-BFFFF range is still uncacheable for VGA.

Reviewed-by: Eric Dong <eric.dong@intel.com>
Cc: Chasel Chiu <chasel.chiu@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Isaac Oram <isaac.w.oram@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Eric Dong <eric.dong@intel.com>
Signed-off-by: Yuanhao Xie <yuanhao.xie@intel.com>
---
 Platform/Intel/MinPlatformPkg/Library/SetCacheMtrrLib/SetCacheMtrrLib.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Platform/Intel/MinPlatformPkg/Library/SetCacheMtrrLib/SetCacheMtrrLib.c b/Platform/Intel/MinPlatformPkg/Library/SetCacheMtrrLib/SetCacheMtrrLib.c
index 05728275a5..38a8db6b3f 100644
--- a/Platform/Intel/MinPlatformPkg/Library/SetCacheMtrrLib/SetCacheMtrrLib.c
+++ b/Platform/Intel/MinPlatformPkg/Library/SetCacheMtrrLib/SetCacheMtrrLib.c
@@ -245,7 +245,7 @@ SetCacheMtrrAfterEndOfPei (
                          &MtrrSetting,
                          0xC0000,
                          0x40000,
-                         CacheWriteProtected
+                         CacheWriteBack
                          );
   ASSERT_EFI_ERROR ( Status);
 
-- 
2.36.1.windows.1



-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#110026): https://edk2.groups.io/g/devel/message/110026
Mute This Topic: https://groups.io/mt/102174308/1787277
Group Owner: devel+owner@edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [importer@patchew.org]
-=-=-=-=-=-=-=-=-=-=-=-