diff --git a/Platform/AMD/OverdriveBoard/OverdriveBoard.dsc b/Platform/AMD/OverdriveBoard/OverdriveBoard.dsc
index 348828e18d44..86061cd4606f 100644
--- a/Platform/AMD/OverdriveBoard/OverdriveBoard.dsc
+++ b/Platform/AMD/OverdriveBoard/OverdriveBoard.dsc
@@ -19,7 +19,6 @@ [Defines]
 
 DEFINE DO_XGBE      = 1
 DEFINE NUM_CORES    = 8
-DEFINE DO_PSCI      = 1
 DEFINE DO_ISCP      = 1
 DEFINE DO_KCS       = 1
 DEFINE DO_FLASHER   = FALSE
@@ -457,12 +456,6 @@ [PcdsFixedAtBuild.common]
   #
   gEfiMdeModulePkgTokenSpaceGuid.PcdDxeNxMemoryProtectionPolicy|0xC000000000007FD1
 
-!if $(DO_PSCI)
-  gAmdStyxTokenSpaceGuid.PcdPsciOsSupport|TRUE
-!else
-  gAmdStyxTokenSpaceGuid.PcdPsciOsSupport|FALSE
-!endif
-
 !if $(DO_ISCP)
   gAmdStyxTokenSpaceGuid.PcdIscpSupport|TRUE
 !else
diff --git a/Platform/LeMaker/CelloBoard/CelloBoard.dsc b/Platform/LeMaker/CelloBoard/CelloBoard.dsc
index 007c36412b93..80b096ba5587 100644
--- a/Platform/LeMaker/CelloBoard/CelloBoard.dsc
+++ b/Platform/LeMaker/CelloBoard/CelloBoard.dsc
@@ -431,7 +431,6 @@ [PcdsFixedAtBuild.common]
   #
   gEfiMdeModulePkgTokenSpaceGuid.PcdDxeNxMemoryProtectionPolicy|0xC000000000007FD1
 
-  gAmdStyxTokenSpaceGuid.PcdPsciOsSupport|TRUE
   gAmdStyxTokenSpaceGuid.PcdIscpSupport|TRUE
 
   # SMBIOS 3.0 only
diff --git a/Platform/SoftIron/Overdrive1000Board/Overdrive1000Board.dsc b/Platform/SoftIron/Overdrive1000Board/Overdrive1000Board.dsc
index 3f4c7c8a3eef..72eb943a8bfd 100644
--- a/Platform/SoftIron/Overdrive1000Board/Overdrive1000Board.dsc
+++ b/Platform/SoftIron/Overdrive1000Board/Overdrive1000Board.dsc
@@ -18,7 +18,6 @@
 [Defines]
 
 DEFINE NUM_CORES    = 4
-DEFINE DO_PSCI      = 1
 DEFINE DO_ISCP      = 1
 DEFINE DO_KCS       = 1
 DEFINE DO_FLASHER   = FALSE
@@ -428,12 +427,6 @@ [PcdsFixedAtBuild.common]
   ## ACPI (no tables < 4GB)
   gEfiMdeModulePkgTokenSpaceGuid.PcdAcpiExposedTableVersions|0x20
 
-!if $(DO_PSCI)
-  gAmdStyxTokenSpaceGuid.PcdPsciOsSupport|TRUE
-!else
-  gAmdStyxTokenSpaceGuid.PcdPsciOsSupport|FALSE
-!endif
-
 !if $(DO_ISCP)
   gAmdStyxTokenSpaceGuid.PcdIscpSupport|TRUE
 !else
diff --git a/Silicon/AMD/Styx/AcpiTables/AcpiTables.inf b/Silicon/AMD/Styx/AcpiTables/AcpiTables.inf
index 057c52512e4e..bff5be4673a4 100644
--- a/Silicon/AMD/Styx/AcpiTables/AcpiTables.inf
+++ b/Silicon/AMD/Styx/AcpiTables/AcpiTables.inf
@@ -82,8 +82,6 @@ [FixedPcd]
   gAmdStyxTokenSpaceGuid.PcdSbsaWakeUpGSIV
   gAmdStyxTokenSpaceGuid.PcdSbsaWatchDogGSIV
   gAmdStyxTokenSpaceGuid.PcdSocCoresPerCluster
-  gAmdStyxTokenSpaceGuid.PcdPsciOsSupport
-  gAmdStyxTokenSpaceGuid.PcdTrustedFWSupport
   gAmdStyxTokenSpaceGuid.PcdParkingProtocolVersion
   gAmdStyxTokenSpaceGuid.PcdSata1PortCount
 
diff --git a/Silicon/AMD/Styx/AcpiTables/Fadt.c b/Silicon/AMD/Styx/AcpiTables/Fadt.c
index bcbff3798883..bdf88a9c8e32 100644
--- a/Silicon/AMD/Styx/AcpiTables/Fadt.c
+++ b/Silicon/AMD/Styx/AcpiTables/Fadt.c
@@ -73,7 +73,7 @@ STATIC EFI_ACPI_5_1_FIXED_ACPI_DESCRIPTION_TABLE AcpiFadt = {
   FADT_FLAGS,                                                               // UINT32     Flags
   NULL_GAS,                                                                 // EFI_ACPI_5_1_GENERIC_ADDRESS_STRUCTURE  ResetReg
   0,                                                                        // UINT8      ResetValue
-  0,                                                                        // UINT16     ArmBootArch
+  EFI_ACPI_5_1_ARM_PSCI_COMPLIANT,                                          // UINT16     ArmBootArch
   1,                                                                        // UINT8      MinorVersion
   0,                                                                        // UINT64     XFirmwareCtrl
   0,                                                                        // UINT64     XDsdt
@@ -96,9 +96,6 @@ FadtTable (
   VOID
   )
 {
-  if (FixedPcdGetBool (PcdPsciOsSupport) && FixedPcdGetBool (PcdTrustedFWSupport)) {
-    AcpiFadt.ArmBootArch = EFI_ACPI_5_1_ARM_PSCI_COMPLIANT;
-  }
   return (EFI_ACPI_DESCRIPTION_HEADER *) &AcpiFadt;
 }
 
diff --git a/Silicon/AMD/Styx/AmdStyx.dec b/Silicon/AMD/Styx/AmdStyx.dec
index 0d7e82f2d768..cffe1cafde8b 100644
--- a/Silicon/AMD/Styx/AmdStyx.dec
+++ b/Silicon/AMD/Styx/AmdStyx.dec
@@ -89,17 +89,12 @@ [PcdsFixedAtBuild]
   gAmdStyxTokenSpaceGuid.PcdSbsaWatchDogGSIV|369|UINT32|0x00050008
 
   # Trusted-Firmware
-  gAmdStyxTokenSpaceGuid.PcdTrustedFWSupport|TRUE|BOOLEAN|0x00060000
   gAmdStyxTokenSpaceGuid.PcdTrustedFWMemoryBase|0x8000000000|UINT64|0x00060001
   gAmdStyxTokenSpaceGuid.PcdTrustedFWMemorySize|0xE80000|UINT64|0x0006002
 
   # ISCP
   gAmdStyxTokenSpaceGuid.PcdIscpSupport|TRUE|BOOLEAN|0x00070000
 
-  # PSCI
-  gAmdStyxTokenSpaceGuid.PcdPsciOsSupport|TRUE|BOOLEAN|0x00080000
-  gAmdStyxTokenSpaceGuid.PcdPsciCpuOnContext|0|UINT64|0x00080001
-
   # Cores Per cluster
   gAmdStyxTokenSpaceGuid.PcdSocCoresPerCluster|2|UINT32|0x00090000
 
diff --git a/Silicon/AMD/Styx/Drivers/PlatInitDxe/PlatInitDxe.c b/Silicon/AMD/Styx/Drivers/PlatInitDxe/PlatInitDxe.c
index fd5bb96f7c98..e713d5581925 100644
--- a/Silicon/AMD/Styx/Drivers/PlatInitDxe/PlatInitDxe.c
+++ b/Silicon/AMD/Styx/Drivers/PlatInitDxe/PlatInitDxe.c
@@ -33,7 +33,6 @@
 
 
 STATIC AMD_MP_CORE_INFO_PROTOCOL  mAmdMpCoreInfoProtocol = { 0 };
-STATIC AMD_MP_BOOT_PROTOCOL       mAmdMpBootProtocol = { 0 };
 STATIC AMD_MP_BOOT_INFO           mAmdMpBootInfo = { 0 };
 
 
@@ -56,13 +55,6 @@ AmdStyxGetMpParkingBase (
   OUT UINTN  *MpParkingSize
   );
 
-STATIC
-VOID
-AmdStyxParkSecondaryCore (
-  ARM_CORE_INFO         *ArmCoreInfo,
-  EFI_PHYSICAL_ADDRESS  SecondaryEntry
-  );
-
 
 #pragma pack(push, 1)
 typedef struct _PMU_INFO {
@@ -94,8 +86,6 @@ PlatInitDxeEntryPoint (
   )
 {
   EFI_STATUS                Status;
-  EFI_PHYSICAL_ADDRESS      MpParkingBase;
-  UINTN                     MpParkingSize;
   ARM_CORE_INFO             *ArmCoreInfoTable;
   UINTN                     ArmCoreCount;
   EFI_HANDLE                Handle = NULL;
@@ -120,39 +110,6 @@ PlatInitDxeEntryPoint (
                   );
   ASSERT_EFI_ERROR (Status);
 
-  // Install MP-Boot Protocol
-  if (!FixedPcdGetBool (PcdPsciOsSupport) &&
-      FixedPcdGetBool (PcdTrustedFWSupport)) {
-    // Allocate Parking area (4KB-aligned, 4KB per core) as Reserved memory
-    MpParkingBase = 0;
-    MpParkingSize = ArmCoreCount * SIZE_4KB;
-    Status = gBS->AllocatePages (AllocateAnyPages, EfiReservedMemoryType,
-                    EFI_SIZE_TO_PAGES (MpParkingSize),
-                    &MpParkingBase);
-    if (EFI_ERROR (Status) || MpParkingBase == 0) {
-      DEBUG ((EFI_D_ERROR, "Warning: Failed to allocate MpParkingBase."));
-    } else {
-      mAmdMpBootInfo.MpParkingBase = MpParkingBase;
-      mAmdMpBootInfo.MpParkingSize = MpParkingSize;
-      mAmdMpBootInfo.ArmCoreInfoTable = ArmCoreInfoTable;
-      mAmdMpBootInfo.ArmCoreCount = ArmCoreCount;
-
-      mAmdMpBootProtocol.ParkSecondaryCore = AmdStyxParkSecondaryCore;
-      mAmdMpBootProtocol.MpBootInfo = &mAmdMpBootInfo;
-
-      Status = gBS->InstallProtocolInterface (
-                      &Handle,
-                      &gAmdMpBootProtocolGuid,
-                      EFI_NATIVE_INTERFACE,
-                      (VOID *)&mAmdMpBootProtocol
-                      );
-      if (EFI_ERROR (Status)) {
-        DEBUG ((EFI_D_ERROR, "Warning: Failed to install MP-Boot Protocol."));
-        gBS->FreePages (MpParkingBase, EFI_SIZE_TO_PAGES (MpParkingSize));
-      }
-    }
-  }
-
   return Status;
 }
 
@@ -208,30 +165,3 @@ AmdStyxGetMpParkingBase (
   *MpParkingSize = mAmdMpBootInfo.MpParkingBase;
   return mAmdMpBootInfo.MpParkingBase;
 }
-
-
-STATIC
-VOID
-AmdStyxParkSecondaryCore (
-  ARM_CORE_INFO         *ArmCoreInfo,
-  EFI_PHYSICAL_ADDRESS  SecondaryEntry
-  )
-{
-  ARM_SMC_ARGS  SmcRegs = {0};
-  UINTN         MpId;
-
-  MpId = GET_MPID (ArmCoreInfo->ClusterId, ArmCoreInfo->CoreId);
-
-  SmcRegs.Arg0 = ARM_SMC_ID_PSCI_CPU_ON_AARCH64;
-  SmcRegs.Arg1 = MpId;
-  SmcRegs.Arg2 = SecondaryEntry;
-  SmcRegs.Arg3 = FixedPcdGet64 (PcdPsciCpuOnContext);
-  ArmCallSmc (&SmcRegs);
-
-  if (SmcRegs.Arg0 == ARM_SMC_PSCI_RET_SUCCESS ||
-      SmcRegs.Arg0 == ARM_SMC_PSCI_RET_ALREADY_ON) {
-    DEBUG ((EFI_D_ERROR, "CPU[MpId] = 0x%X at RUN state.\n", MpId));
-  } else {
-    DEBUG ((EFI_D_ERROR, "Warning: Could not transition CPU[MpId] = 0x%X to RUN state.\n", MpId));
-  }
-}
diff --git a/Silicon/AMD/Styx/Drivers/PlatInitDxe/PlatInitDxe.inf b/Silicon/AMD/Styx/Drivers/PlatInitDxe/PlatInitDxe.inf
index 15f46be651b7..1ebde2723355 100644
--- a/Silicon/AMD/Styx/Drivers/PlatInitDxe/PlatInitDxe.inf
+++ b/Silicon/AMD/Styx/Drivers/PlatInitDxe/PlatInitDxe.inf
@@ -51,12 +51,6 @@ [Guids]
 
 [Protocols]
   gAmdMpCoreInfoProtocolGuid         ## PRODUCER
-  gAmdMpBootProtocolGuid             ## PRODUCER
-
-[FixedPcd]
-  gAmdStyxTokenSpaceGuid.PcdPsciOsSupport
-  gAmdStyxTokenSpaceGuid.PcdPsciCpuOnContext
-  gAmdStyxTokenSpaceGuid.PcdTrustedFWSupport
 
 [Depex]
   TRUE
diff --git a/Silicon/AMD/Styx/Drivers/PlatInitPei/PlatInitPei.inf b/Silicon/AMD/Styx/Drivers/PlatInitPei/PlatInitPei.inf
index 9f141946aea5..ccc079bebab2 100644
--- a/Silicon/AMD/Styx/Drivers/PlatInitPei/PlatInitPei.inf
+++ b/Silicon/AMD/Styx/Drivers/PlatInitPei/PlatInitPei.inf
@@ -68,7 +68,6 @@ [Pcd]
 
 [FixedPcd]
   gAmdStyxTokenSpaceGuid.PcdIscpSupport
-  gAmdStyxTokenSpaceGuid.PcdTrustedFWSupport
   gAmdStyxTokenSpaceGuid.PcdCpuIdRegister
 
 [Depex]
diff --git a/Silicon/AMD/Styx/Library/MemoryInitPei/MemoryInitPeiLib.c b/Silicon/AMD/Styx/Library/MemoryInitPei/MemoryInitPeiLib.c
index 70821d1b120b..67f90efdcb3f 100644
--- a/Silicon/AMD/Styx/Library/MemoryInitPei/MemoryInitPeiLib.c
+++ b/Silicon/AMD/Styx/Library/MemoryInitPei/MemoryInitPeiLib.c
@@ -127,36 +127,34 @@ MemoryPeim (
 
   Base = PcdGet64 (PcdSystemMemoryBase);
   Size = PcdGet64 (PcdSystemMemorySize);
-  if (FixedPcdGetBool (PcdTrustedFWSupport)) {
-
-    //
-    // For now, we assume that the trusted firmware region is at the base of
-    // system memory, since that is much easier to deal with.
-    //
-    ASSERT (Base == PcdGet64 (PcdTrustedFWMemoryBase));
-
-    Base += PcdGet64 (PcdTrustedFWMemorySize);
-    Size -= PcdGet64 (PcdTrustedFWMemorySize);
-
-    // Reserved Trusted Firmware region
-    BuildResourceDescriptorHob (
-        EFI_RESOURCE_SYSTEM_MEMORY,
-      ( EFI_RESOURCE_ATTRIBUTE_PRESENT |
-        EFI_RESOURCE_ATTRIBUTE_INITIALIZED |
-        EFI_RESOURCE_ATTRIBUTE_WRITE_COMBINEABLE |
-        EFI_RESOURCE_ATTRIBUTE_WRITE_THROUGH_CACHEABLE |
-        EFI_RESOURCE_ATTRIBUTE_WRITE_BACK_CACHEABLE |
-        EFI_RESOURCE_ATTRIBUTE_TESTED ),
-        PcdGet64 (PcdTrustedFWMemoryBase),
-        PcdGet64 (PcdTrustedFWMemorySize)
-      );
-
-      BuildMemoryAllocationHob (
-        PcdGet64 (PcdTrustedFWMemoryBase),
-        PcdGet64 (PcdTrustedFWMemorySize),
-        EfiReservedMemoryType
-      );
-  }
+
+  //
+  // For now, we assume that the trusted firmware region is at the base of
+  // system memory, since that is much easier to deal with.
+  //
+  ASSERT (Base == PcdGet64 (PcdTrustedFWMemoryBase));
+
+  Base += PcdGet64 (PcdTrustedFWMemorySize);
+  Size -= PcdGet64 (PcdTrustedFWMemorySize);
+
+  // Reserved Trusted Firmware region
+  BuildResourceDescriptorHob (
+      EFI_RESOURCE_SYSTEM_MEMORY,
+    ( EFI_RESOURCE_ATTRIBUTE_PRESENT |
+      EFI_RESOURCE_ATTRIBUTE_INITIALIZED |
+      EFI_RESOURCE_ATTRIBUTE_WRITE_COMBINEABLE |
+      EFI_RESOURCE_ATTRIBUTE_WRITE_THROUGH_CACHEABLE |
+      EFI_RESOURCE_ATTRIBUTE_WRITE_BACK_CACHEABLE |
+      EFI_RESOURCE_ATTRIBUTE_TESTED ),
+      PcdGet64 (PcdTrustedFWMemoryBase),
+      PcdGet64 (PcdTrustedFWMemorySize)
+    );
+
+  BuildMemoryAllocationHob (
+    PcdGet64 (PcdTrustedFWMemoryBase),
+    PcdGet64 (PcdTrustedFWMemorySize),
+    EfiReservedMemoryType
+  );
 
   // Declare system memory
   BuildResourceDescriptorHob (
diff --git a/Silicon/AMD/Styx/Library/MemoryInitPei/MemoryInitPeiLib.inf b/Silicon/AMD/Styx/Library/MemoryInitPei/MemoryInitPeiLib.inf
index 724d71645d5a..d17e6c26feb5 100644
--- a/Silicon/AMD/Styx/Library/MemoryInitPei/MemoryInitPeiLib.inf
+++ b/Silicon/AMD/Styx/Library/MemoryInitPei/MemoryInitPeiLib.inf
@@ -69,7 +69,6 @@ [FixedPcd]
   gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiLoaderCode
   gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiLoaderData
 
-  gAmdStyxTokenSpaceGuid.PcdTrustedFWSupport
   gAmdStyxTokenSpaceGuid.PcdTrustedFWMemoryBase
   gAmdStyxTokenSpaceGuid.PcdTrustedFWMemorySize
 
diff --git a/Silicon/AMD/Styx/Library/ResetSystemLib/ResetSystemLib.inf b/Silicon/AMD/Styx/Library/ResetSystemLib/ResetSystemLib.inf
index 5a99fd79384a..d9faf3abb09a 100644
--- a/Silicon/AMD/Styx/Library/ResetSystemLib/ResetSystemLib.inf
+++ b/Silicon/AMD/Styx/Library/ResetSystemLib/ResetSystemLib.inf
@@ -42,6 +42,3 @@ [LibraryClasses]
   PcdLib
   BaseLib
   ArmSmcLib
-
-[FixedPcd]
-  gAmdStyxTokenSpaceGuid.PcdTrustedFWSupport
diff --git a/Silicon/AMD/Styx/Library/StyxDtbLoaderLib/StyxDtbLoaderLib.inf b/Silicon/AMD/Styx/Library/StyxDtbLoaderLib/StyxDtbLoaderLib.inf
index fc8b25c92873..3f36799f5df1 100644
--- a/Silicon/AMD/Styx/Library/StyxDtbLoaderLib/StyxDtbLoaderLib.inf
+++ b/Silicon/AMD/Styx/Library/StyxDtbLoaderLib/StyxDtbLoaderLib.inf
@@ -51,8 +51,6 @@ [Pcd]
 [FixedPcd]
   gArmTokenSpaceGuid.PcdArmLinuxFdtMaxOffset
   gArmTokenSpaceGuid.PcdArmLinuxFdtAlignment
-  gAmdStyxTokenSpaceGuid.PcdPsciOsSupport
-  gAmdStyxTokenSpaceGuid.PcdTrustedFWSupport
   gAmdStyxTokenSpaceGuid.PcdSata1PortCount
 
 [Guids]
