Index: Universal/Console/ConSplitterDxe/ConSplitter.c
===================================================================
--- Universal/Console/ConSplitterDxe/ConSplitter.c	(revision 15548)
+++ Universal/Console/ConSplitterDxe/ConSplitter.c	(working copy)
@@ -4557,7 +4557,7 @@
   //
   // Check whether param Attribute is valid.
   //
-  if ( (Attribute > (UINTN)(((UINT32)-1)>>1)) ) {
+  if ((Attribute | 0x7F) != 0x7F) {
     return EFI_UNSUPPORTED;
   }