1. Add three sample PCD in HelloWorld application for user reference of PCD usage.

2. PeiCore will always build FvHob for the extracted FvImage once it decompresses the new FvImage. 

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5930 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Application/HelloWorld/HelloWorld.c

@@ -13,6 +13,7 @@
 **/
 
 #include <Uefi.h>
+#include <Library/PcdLib.h>
 #include <Library/DebugLib.h>
 #include <Library/UefiLib.h>
 #include <Library/UefiApplicationEntryPoint.h>
@@ -37,10 +38,19 @@ UefiMain (
   IN EFI_HANDLE        ImageHandle,
   IN EFI_SYSTEM_TABLE  *SystemTable
   )
-
 {
+	UINT32 Index;
+	
+	Index = 0;
   
-  Print ((CHAR16 *)L"UEFI Hello World!\n");
+  //
+  // Three PCD type (FeatureFlag, UINT32 and String) are used as the sample.
+  //
+  if (FeaturePcdGet (PcdHelloWorldPrintEnable)) {
+  	for (Index = 0; Index < PcdGet32 (PcdHelloWorldPrintTimes); Index ++) {
+    	Print ((CHAR16*)PcdGetPtr (PcdHelloWorldPrintString));
+    }
+  }
 
   return EFI_SUCCESS;
 }

MdeModulePkg/Application/HelloWorld/HelloWorld.inf

@@ -31,18 +31,29 @@
 #  VALID_ARCHITECTURES           = IA32 X64 IPF EBC
 #
 
-[Sources.common]
+[Sources]
   HelloWorld.c
 
-
 [Packages]
   MdePkg/MdePkg.dec
-
+  MdeModulePkg/MdeModulePkg.dec
 
 [LibraryClasses]
   UefiBootServicesTableLib
   UefiApplicationEntryPoint
   UefiLib
   DebugLib
+  PcdLib
 
+[Guids]
 
+[Ppis]
+
+[Protocols]
+
+[FeaturePcd]
+  gEfiMdeModulePkgTokenSpaceGuid.PcdHelloWorldPrintEnable
+
+[Pcd]
+  gEfiMdeModulePkgTokenSpaceGuid.PcdHelloWorldPrintString
+  gEfiMdeModulePkgTokenSpaceGuid.PcdHelloWorldPrintTimes