diff --git a/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBios.c b/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBios.c
index c90231af07..0381098c8a 100644
--- a/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBios.c
+++ b/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBios.c
@@ -695,6 +695,7 @@ LegacyBiosInstall (
   UINT32                             MemorySize;
   EFI_GCD_MEMORY_SPACE_DESCRIPTOR    Descriptor;
   UINT64                             Length;
+  UINT8                              *SecureBoot;
 
   //
   // Load this driver's image to memory
@@ -704,6 +705,20 @@ LegacyBiosInstall (
     return Status;
   }
 
+  //
+  // When UEFI Secure Boot is enabled, CSM module will not start any more.
+  //
+  SecureBoot = NULL;
+  GetEfiGlobalVariable2 (EFI_SECURE_BOOT_MODE_NAME, (VOID**)&SecureBoot, NULL);
+  if ((SecureBoot != NULL) && (*SecureBoot == SECURE_BOOT_MODE_ENABLE)) {
+    FreePool (SecureBoot);
+    return EFI_SECURITY_VIOLATION;
+  }
+  
+  if (SecureBoot != NULL) {
+    FreePool (SecureBoot);
+  }
+
   Private = &mPrivateData;
   ZeroMem (Private, sizeof (LEGACY_BIOS_INSTANCE));
 
diff --git a/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBiosDxe.inf b/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBiosDxe.inf
index 4b6635e6bf..ea8cb6bd08 100644
--- a/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBiosDxe.inf
+++ b/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBiosDxe.inf
@@ -3,7 +3,7 @@
 #
 # This driver installs Legacy Bios Protocol to support CSM module work in EFI system.
 #
-# Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>
 #
 # This program and the accompanying materials
 # are licensed and made available under the terms and conditions
@@ -142,5 +142,5 @@
   gEfiIntelFrameworkModulePkgTokenSpaceGuid.PcdHighPmmMemorySize
 
 [Depex]
-  gEfiLegacyRegion2ProtocolGuid AND gEfiLegacyInterruptProtocolGuid AND gEfiLegacyBiosPlatformProtocolGuid AND gEfiLegacy8259ProtocolGuid AND gEfiGenericMemTestProtocolGuid AND gEfiCpuArchProtocolGuid AND gEfiTimerArchProtocolGuid
+  gEfiLegacyRegion2ProtocolGuid AND gEfiLegacyInterruptProtocolGuid AND gEfiLegacyBiosPlatformProtocolGuid AND gEfiLegacy8259ProtocolGuid AND gEfiGenericMemTestProtocolGuid AND gEfiCpuArchProtocolGuid AND gEfiTimerArchProtocolGuid AND gEfiVariableWriteArchProtocolGuid
 
diff --git a/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBiosInterface.h b/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBiosInterface.h
index a42e847250..f2e4bbfffd 100644
--- a/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBiosInterface.h
+++ b/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBiosInterface.h
@@ -24,6 +24,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 #include <Guid/DxeServices.h>
 #include <Guid/LegacyBios.h>
 #include <Guid/StatusCodeDataTypeId.h>
+#include <Guid/ImageAuthentication.h>
 
 #include <Protocol/BlockIo.h>
 #include <Protocol/LoadedImage.h>