1) Change Framework version of PeiServiceTable's PciCfg from PEI_PCI_CFG_PPI to ECP_PEI_PCI_CFG_PPI. This help to detect if user is calling PeiServiceTable->PciCfg->Modify in a PI platform. Modify between Framework spec and PI spec is not compatible.

2) Add ECP_PEI_PCI_CFG_PPI to EdkFrameworkPpiLib
3) Add PeiLibPciCfgModify which call PciCfg2. This function will used by modified Framework Module which will be working with a PI platform.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5260 6f19259b-4bc3-4df7-8a09-765794883524

EdkCompatibilityPkg/Foundation/Framework/Ppi/EcpPciCfg/EcpPciCfg.c

@@ -0,0 +1,28 @@
+/*++
+
+Copyright (c) 2004, 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.             
+
+Module Name:
+
+ EcpPciCfg.c
+
+Abstract:
+
+  This PPI which is same with PciCfg PPI. But Modify API is removed.
+
+--*/
+
+#include "Tiano.h"
+#include "Pei.h"
+#include EFI_PPI_DEFINITION (EcpPciCfg)
+
+EFI_GUID  gEcpPeiPciCfgPpiGuid = ECP_PEI_PCI_CFG_PPI_GUID;
+
+EFI_GUID_STRING(&gEcpPeiPciCfgPpiGuid, "Ecp PciCfg", "Ecp PciCfg PPI");