diff --git a/ArmPkg/ArmPkg.dec b/ArmPkg/ArmPkg.dec
index e9b33b63343a..ab0f603fd43a 100644
--- a/ArmPkg/ArmPkg.dec
+++ b/ArmPkg/ArmPkg.dec
@@ -113,12 +113,6 @@
   gArmTokenSpaceGuid.PcdHypFvBaseAddress|0|UINT32|0x0000003C
   gArmTokenSpaceGuid.PcdHypFvSize|0|UINT32|0x0000003D
 
-  # System Memory (DRAM): These PCDs define the region of in-built system memory
-  # Some platforms can get DRAM extensions, these additional regions will be declared
-  # to UEFI by ArmPlatformLib
-  gArmTokenSpaceGuid.PcdSystemMemoryBase|0|UINT64|0x00000029
-  gArmTokenSpaceGuid.PcdSystemMemorySize|0|UINT64|0x0000002A
-
   # Use ClusterId + CoreId to identify the PrimaryCore
   gArmTokenSpaceGuid.PcdArmPrimaryCoreMask|0xF03|UINT32|0x00000031
   # The Primary Core is ClusterId[0] & CoreId[0]
@@ -140,6 +134,12 @@
 
 
 [PcdsFixedAtBuild.common,PcdsDynamic.common]
+  # System Memory (DRAM): These PCDs define the region of in-built system memory
+  # Some platforms can get DRAM extensions, these additional regions will be declared
+  # to UEFI by ArmPlatformLib
+  gArmTokenSpaceGuid.PcdSystemMemoryBase|0|UINT64|0x00000029
+  gArmTokenSpaceGuid.PcdSystemMemorySize|0|UINT64|0x0000002A
+
   #
   # ARM Architectural Timer
   #
diff --git a/ArmPkg/Library/BdsLib/BdsLib.inf b/ArmPkg/Library/BdsLib/BdsLib.inf
index 3e1ae8914abf..7302d6ab1b1c 100644
--- a/ArmPkg/Library/BdsLib/BdsLib.inf
+++ b/ArmPkg/Library/BdsLib/BdsLib.inf
@@ -77,10 +77,11 @@
 [FeaturePcd]
   gArmTokenSpaceGuid.PcdArmLinuxSpinTable
 
-[FixedPcd]
+[Pcd]
   gArmTokenSpaceGuid.PcdSystemMemoryBase
   gArmTokenSpaceGuid.PcdSystemMemorySize
 
+[FixedPcd]
   gArmTokenSpaceGuid.PcdArmMachineType
   gArmTokenSpaceGuid.PcdArmLinuxFdtMaxOffset
   gArmTokenSpaceGuid.PcdArmLinuxFdtAlignment
diff --git a/ArmPlatformPkg/Library/ArmPlatformGlobalVariableLib/PrePi/PrePiArmPlatformGlobalVariableLib.inf b/ArmPlatformPkg/Library/ArmPlatformGlobalVariableLib/PrePi/PrePiArmPlatformGlobalVariableLib.inf
index 5d3a93fb7207..596f5595412e 100644
--- a/ArmPlatformPkg/Library/ArmPlatformGlobalVariableLib/PrePi/PrePiArmPlatformGlobalVariableLib.inf
+++ b/ArmPlatformPkg/Library/ArmPlatformGlobalVariableLib/PrePi/PrePiArmPlatformGlobalVariableLib.inf
@@ -37,9 +37,10 @@
   gArmTokenSpaceGuid.PcdFdBaseAddress
   gArmTokenSpaceGuid.PcdFdSize
 
-  gArmTokenSpaceGuid.PcdSystemMemoryBase
-  gArmTokenSpaceGuid.PcdSystemMemorySize
-
   gArmPlatformTokenSpaceGuid.PcdCPUCorePrimaryStackSize
   gArmPlatformTokenSpaceGuid.PcdPeiGlobalVariableSize
 
+[Pcd]
+  gArmTokenSpaceGuid.PcdSystemMemoryBase
+  gArmTokenSpaceGuid.PcdSystemMemorySize
+
diff --git a/ArmPlatformPkg/MemoryInitPei/MemoryInitPeiLib.inf b/ArmPlatformPkg/MemoryInitPei/MemoryInitPeiLib.inf
index 4b21caa0279e..441f8848e7d9 100755
--- a/ArmPlatformPkg/MemoryInitPei/MemoryInitPeiLib.inf
+++ b/ArmPlatformPkg/MemoryInitPei/MemoryInitPeiLib.inf
@@ -48,8 +48,6 @@
   gArmTokenSpaceGuid.PcdFdBaseAddress
   gArmTokenSpaceGuid.PcdFdSize
 
-  gArmTokenSpaceGuid.PcdSystemMemoryBase
-  gArmTokenSpaceGuid.PcdSystemMemorySize
   gArmPlatformTokenSpaceGuid.PcdSystemMemoryUefiRegionSize
 
   gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiACPIReclaimMemory
@@ -62,5 +60,9 @@
   gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiLoaderCode
   gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiLoaderData
 
+[Pcd]
+  gArmTokenSpaceGuid.PcdSystemMemoryBase
+  gArmTokenSpaceGuid.PcdSystemMemorySize
+   
 [depex]
   TRUE
diff --git a/ArmPlatformPkg/MemoryInitPei/MemoryInitPeim.c b/ArmPlatformPkg/MemoryInitPei/MemoryInitPeim.c
index 4821fdc2fa89..587c4b5ce3a3 100755
--- a/ArmPlatformPkg/MemoryInitPei/MemoryInitPeim.c
+++ b/ArmPlatformPkg/MemoryInitPei/MemoryInitPeim.c
@@ -103,14 +103,6 @@ InitializeMemory (
 
   DEBUG ((EFI_D_ERROR, "Memory Init PEIM Loaded\n"));
 
-  // Ensure PcdSystemMemorySize has been set
-  ASSERT (FixedPcdGet64 (PcdSystemMemorySize) != 0);
-
-  SystemMemoryBase = (UINTN)FixedPcdGet64 (PcdSystemMemoryBase);
-  SystemMemoryTop = SystemMemoryBase + (UINTN)FixedPcdGet64 (PcdSystemMemorySize);
-  FdBase = (UINTN)PcdGet32 (PcdFdBaseAddress);
-  FdTop = FdBase + (UINTN)PcdGet32 (PcdFdSize);
-
   //
   // Initialize the System Memory (DRAM)
   //
@@ -119,6 +111,14 @@ InitializeMemory (
     ArmPlatformInitializeSystemMemory ();
   }
 
+  // Ensure PcdSystemMemorySize has been set
+  ASSERT (PcdGet64 (PcdSystemMemorySize) != 0);
+
+  SystemMemoryBase = (UINTN)PcdGet64 (PcdSystemMemoryBase);
+  SystemMemoryTop = SystemMemoryBase + (UINTN)PcdGet64 (PcdSystemMemorySize);
+  FdBase = (UINTN)PcdGet32 (PcdFdBaseAddress);
+  FdTop = FdBase + (UINTN)PcdGet32 (PcdFdSize);
+
   //
   // Declare the UEFI memory to PEI
   //
diff --git a/ArmPlatformPkg/MemoryInitPei/MemoryInitPeim.inf b/ArmPlatformPkg/MemoryInitPei/MemoryInitPeim.inf
index 504026e90f6c..9643392cada2 100755
--- a/ArmPlatformPkg/MemoryInitPei/MemoryInitPeim.inf
+++ b/ArmPlatformPkg/MemoryInitPei/MemoryInitPeim.inf
@@ -55,8 +55,6 @@
   gArmTokenSpaceGuid.PcdFdBaseAddress
   gArmTokenSpaceGuid.PcdFdSize
 
-  gArmTokenSpaceGuid.PcdSystemMemoryBase
-  gArmTokenSpaceGuid.PcdSystemMemorySize
   gArmPlatformTokenSpaceGuid.PcdSystemMemoryUefiRegionSize
 
   gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiACPIReclaimMemory
@@ -69,5 +67,9 @@
   gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiLoaderCode
   gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiLoaderData
 
+[Pcd]
+  gArmTokenSpaceGuid.PcdSystemMemoryBase
+  gArmTokenSpaceGuid.PcdSystemMemorySize
+   
 [Depex]
   TRUE
diff --git a/ArmPlatformPkg/PrePi/PeiUniCore.inf b/ArmPlatformPkg/PrePi/PeiUniCore.inf
index 1c0737bdedcb..f8925737ff62 100755
--- a/ArmPlatformPkg/PrePi/PeiUniCore.inf
+++ b/ArmPlatformPkg/PrePi/PeiUniCore.inf
@@ -88,8 +88,6 @@
 
   gArmPlatformTokenSpaceGuid.PcdPeiGlobalVariableSize
 
-  gArmTokenSpaceGuid.PcdSystemMemoryBase
-  gArmTokenSpaceGuid.PcdSystemMemorySize
   gArmPlatformTokenSpaceGuid.PcdSystemMemoryUefiRegionSize
 
   gArmPlatformTokenSpaceGuid.PcdCoreCount
@@ -106,3 +104,7 @@
   gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiBootServicesData
   gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiLoaderCode
   gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiLoaderData
+
+[Pcd]
+  gArmTokenSpaceGuid.PcdSystemMemoryBase
+  gArmTokenSpaceGuid.PcdSystemMemorySize
