diff --git a/SecurityPkg/Tcg/Tcg2Smm/Tpm.asl b/SecurityPkg/Tcg/Tcg2Smm/Tpm.asl
index 776f43e972..ba316cfc22 100644
--- a/SecurityPkg/Tcg/Tcg2Smm/Tpm.asl
+++ b/SecurityPkg/Tcg/Tcg2Smm/Tpm.asl
@@ -3,6 +3,7 @@
   and MemoryClear.
 
 Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
+(c)Copyright 2016 HP Development Company, L.P.<BR>
 This program and the accompanying materials 
 are licensed and made available under the terms and conditions of the BSD License 
 which accompanies this distribution.  The full text of the license may be found at 
@@ -40,7 +41,7 @@ DefinitionBlock (
       // Return the resource consumed by TPM device
       //
       Name (_CRS, ResourceTemplate () {
-        Memory32Fixed (ReadOnly, 0xfed40000, 0x5000)
+        Memory32Fixed (ReadWrite, 0xfed40000, 0x5000)
       })
 
       //