PcdRealTimeClockUpdateTimeout is now defined in MdeModulePkg.dec.
This is the only reason that causes PcAtChipsetPkg depends on
MdeModulePkg.
Move the PCD from MdeModulePkg.dec to PcAtChipsetPkg.dec removes
such dependency.

Signed-off-by: Ray Ni <ray.ni@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
---
 PcAtChipsetPkg/PcAtChipsetPkg.dec                           | 6 +++++-
 .../PcatRealTimeClockRuntimeDxe.inf                         | 5 ++---
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/PcAtChipsetPkg/PcAtChipsetPkg.dec b/PcAtChipsetPkg/PcAtChipsetPkg.dec
index d99d91496b..aad53b07c8 100644
--- a/PcAtChipsetPkg/PcAtChipsetPkg.dec
+++ b/PcAtChipsetPkg/PcAtChipsetPkg.dec
@@ -4,7 +4,7 @@
 # This package is designed to public interfaces and implementation which follows
 # PcAt defacto standard.
 #
-# Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2009 - 2019, Intel Corporation. All rights reserved.<BR>
 # Copyright (c) 2017, AMD Inc. All rights reserved.<BR>
 #
 # SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -138,5 +138,9 @@ [PcdsFixedAtBuild, PcdsPatchableInModule]
   # @Prompt RTC Target Register address
   gPcAtChipsetPkgTokenSpaceGuid.PcdRtcTargetRegister|0x71|UINT8|0x0000001F
 
+  ## RTC Update Timeout Value(microsecond).
+  # @Prompt RTC Update Timeout Value.
+  gPcAtChipsetPkgTokenSpaceGuid.PcdRealTimeClockUpdateTimeout|100000|UINT32|0x00000020
+
 [UserExtensions.TianoCore."ExtraFiles"]
   PcAtChipsetPkgExtra.uni
diff --git a/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcatRealTimeClockRuntimeDxe.inf b/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcatRealTimeClockRuntimeDxe.inf
index 9a0948be70..c73ee98105 100644
--- a/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcatRealTimeClockRuntimeDxe.inf
+++ b/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcatRealTimeClockRuntimeDxe.inf
@@ -4,7 +4,7 @@
 # This driver provides GetTime, SetTime, GetWakeupTime, SetWakeupTime services to Runtime Service Table.
 # It will install a tagging protocol with gEfiRealTimeClockArchProtocolGuid.
 #
-# Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
 # Copyright (c) 2017, AMD Inc. All rights reserved.<BR>
 #
 # SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -33,7 +33,6 @@ [Sources]
 
 [Packages]
   MdePkg/MdePkg.dec
-  MdeModulePkg/MdeModulePkg.dec
   PcAtChipsetPkg/PcAtChipsetPkg.dec
 
 [LibraryClasses]
@@ -68,7 +67,7 @@ [FixedPcd]
   gPcAtChipsetPkgTokenSpaceGuid.PcdInitialValueRtcRegisterD     ## CONSUMES
 
 [Pcd]
-  gEfiMdeModulePkgTokenSpaceGuid.PcdRealTimeClockUpdateTimeout  ## CONSUMES
+  gPcAtChipsetPkgTokenSpaceGuid.PcdRealTimeClockUpdateTimeout   ## CONSUMES
   gPcAtChipsetPkgTokenSpaceGuid.PcdMinimalValidYear             ## CONSUMES
   gPcAtChipsetPkgTokenSpaceGuid.PcdMaximalValidYear             ## CONSUMES
   gPcAtChipsetPkgTokenSpaceGuid.PcdRtcIndexRegister             ## CONSUMES
-- 
2.21.0.windows.1


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