diff --git a/ArmPkg/ArmPkg.dec b/ArmPkg/ArmPkg.dec
index f0b136a57a..a8a22c649f 100644
--- a/ArmPkg/ArmPkg.dec
+++ b/ArmPkg/ArmPkg.dec
@@ -84,6 +84,13 @@
   # hardware coherency (i.e., no virtualization or cache coherent DMA)
   gArmTokenSpaceGuid.PcdNormalMemoryNonshareableOverride|FALSE|BOOLEAN|0x00000043
 
+[PcdsFeatureFlag.AARCH64]
+  ## Used to select method for requesting services from S-EL1.<BR><BR>
+  #   TRUE  - Selects FF-A calls for communication between S-EL0 and SPMC.<BR>
+  #   FALSE - Selects SVC calls for communication between S-EL0 and SPMC.<BR>
+  # @Prompt Enable FF-A support.
+  gArmTokenSpaceGuid.PcdFfaEnable|FALSE|BOOLEAN|0x0000005B
+
 [PcdsFixedAtBuild.common]
   gArmTokenSpaceGuid.PcdTrustzoneSupport|FALSE|BOOLEAN|0x00000006