update the usage help text on variable statistic information.

VariableInfo application also is added a output string to help user know what happens.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@8596 6f19259b-4bc3-4df7-8a09-765794883524

3 files changed, 13 insertions, 2 deletions

diff --git a/MdeModulePkg/Application/VariableInfo/VariableInfo.c b/MdeModulePkg/Application/VariableInfo/VariableInfo.c
index ba4f553..ac92cc3 100644
--- a/MdeModulePkg/Application/VariableInfo/VariableInfo.c
+++ b/MdeModulePkg/Application/VariableInfo/VariableInfo.c
@@ -82,6 +82,13 @@ UefiMain (
       VariableInfo = VariableInfo->Next;

     } while (VariableInfo != NULL);

 

+  } else {

+    Print (L"Warning: Variable Dxe driver doesn't enable the feature of statistical information!\n");

+    Print (L"If you want to see this info, please:\n");

+    Print (L"  1. Set PcdVariableCollectStatistics as TRUE\n");

+    Print (L"  2. Rebuild Variable Dxe driver\n");

+    Print (L"  3. Run \"VariableInfo\" cmd again\n");

+

   }

 

   return Status;

diff --git a/MdeModulePkg/Application/VariableInfo/VariableInfo.inf b/MdeModulePkg/Application/VariableInfo/VariableInfo.inf
index f963db5..7cadb23 100644
--- a/MdeModulePkg/Application/VariableInfo/VariableInfo.inf
+++ b/MdeModulePkg/Application/VariableInfo/VariableInfo.inf
@@ -2,7 +2,9 @@
 #  Sample UEFI Application Reference Module.

 #  This is a shell application that will display statistical information about variable

 #  usage.

-# 

+#  Note that if Variable Dxe driver doesn't enable the feature by setting PcdVariableCollectStatistics

+#  as TRUE, The application will not display variable statistical information.

+#

 #  Copyright (c) 2007 - 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

diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec
index 0c8de2b..8fdf10d 100644
--- a/MdeModulePkg/MdeModulePkg.dec
+++ b/MdeModulePkg/MdeModulePkg.dec
@@ -169,7 +169,9 @@
     

   ## If TRUE, enable the statistic functionality about variable usage. Such information is

   #  stored as a vendor configuration table into the EFI system table.

-  #  If user wants to get variable usage info, this pcd should be set as TRUE.

+  #  If user wants to use VariableInfo application in MdeModulePkg\Application directory to get

+  #  variable usage info, this pcd should be set as TRUE. Otherwise VariableInfo application can 

+  #  not output useful info.

   gEfiMdeModulePkgTokenSpaceGuid.PcdVariableCollectStatistics|FALSE|BOOLEAN|0x0001003f

   

   ## If TRUE, Unicode Collation Protocol will be installed.