diff --git a/EdkCompatibilityPkg/Compatibility/Include/Ppi/EcpPciCfg.h b/EdkCompatibilityPkg/Compatibility/Include/Ppi/EcpPciCfg.h
new file mode 100644
index 0000000000..0fb347692e
--- /dev/null
+++ b/EdkCompatibilityPkg/Compatibility/Include/Ppi/EcpPciCfg.h
@@ -0,0 +1,44 @@
+/** @file
+
+Copyright (c) 2008, Intel Corporation                                                         
+All rights reserved. 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        
+http://opensource.org/licenses/bsd-license.php                                            
+                                                                                          
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             
+
+**/
+
+#ifndef _PEI_PCI_CFG_H_
+#define _PEI_PCI_CFG_H_
+
+#include <Ppi/PciCfg2.h>
+
+#define ECP_PEI_PCI_CFG_PPI_GUID \
+  { \
+    {0xb0ee53d4, 0xa049, 0x4a79, { 0xb2, 0xff, 0x19, 0xd9, 0xfa, 0xef, 0xaa, 0x94 }} \
+  }
+
+typedef struct _ECP_PEI_PCI_CFG_PPI ECP_PEI_PCI_CFG_PPI;
+
+
+typedef
+EFI_STATUS
+(EFIAPI *ECP_PEI_PCI_CFG_PPI_IO) (
+  IN EFI_PEI_SERVICES         **PeiServices,
+  IN ECP_PEI_PCI_CFG_PPI      * This,
+  IN EFI_PEI_PCI_CFG_PPI_WIDTH Width,
+  IN UINT64                   Address,
+  IN OUT VOID                 *Buffer
+  );
+
+struct _ECP_PEI_PCI_CFG_PPI {
+  ECP_PEI_PCI_CFG_PPI_IO  Read;
+  ECP_PEI_PCI_CFG_PPI_IO  Write;
+};
+
+extern EFI_GUID gEcpPeiPciCfgPpiGuid;
+
+#endif
diff --git a/EdkCompatibilityPkg/Compatibility/Include/Ppi/ReadOnlyVariableThunkPresent.h b/EdkCompatibilityPkg/Compatibility/Include/Ppi/ReadOnlyVariableThunkPresent.h
new file mode 100644
index 0000000000..9ca395d3b8
--- /dev/null
+++ b/EdkCompatibilityPkg/Compatibility/Include/Ppi/ReadOnlyVariableThunkPresent.h
@@ -0,0 +1,28 @@
+/** @file
+  PPI published by the ReadOnlyVariable to ReadOnlyVariable2 or ReadOnlyVariable2 to ReadOnlyVariable
+  thunking PEIM to mark that such module has already been excuted.
+
+  This PPI is referenced in Edk2/EdkCompatibility/Compatibility/ReadOnlyVariable2ToReadOnlyVariable 
+  and Edk2/EdkCompatibility/Compatibility/ReadOnlyVariable2ToReadOnlyVariable.
+
+Copyright (c) 2006 - 2008, Intel Corporation. <BR>
+All rights reserved. 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
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef _PEI_READONLY_VARIABLE_THUNK_PRESENT_H_
+#define _PEI_READONLY_VARIABLE_THUNK_PRESENT_H_
+
+#define PEI_READONLY_VARIABLE_THUNK_PRESENT_GUID  \
+  { 0xe84e9e0b, 0xb5dd, 0x4d08, { 0x9e, 0x46, 0x82, 0x1f, 0xf, 0x14, 0xe9, 0x1b } }
+
+extern EFI_GUID                     gPeiReadonlyVariableThunkPresentPpiGuid;
+
+#endif
+