[edk2,6/6] ArmPlatformPkg/ArmVExpressDxe: simply FDT handling in ArmFvpDxe

Message ID 20170329134833.12956-7-ard.biesheuvel@linaro.org
State New
Headers show
Series
  • Embedded|ArmPlatformPkg: spring cleaning + DtPlatformDxe switch
Related show

Commit Message

Ard Biesheuvel March 29, 2017, 1:48 p.m.
Replace the elaborate but awkward handling of FDT images using device
paths and string PCDs initialized to 128 spaces with a simple scheme
involving a set of builtin DTBs and a bit of runtime logic to select
between them.

This is sufficient for ordinary use, which makes it more suitable as
reference code. Note that overriding the DTB presented to the OS can
easily be done with a UEFI application that simply installs a new DTB
image under the existing FDT configuration table GUID.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

---
 ArmPlatformPkg/ArmVExpressPkg/ArmVExpressDxe/AArch64/ArmFvpDxeAArch64.c |  60 +++------
 ArmPlatformPkg/ArmVExpressPkg/ArmVExpressDxe/ArmFvpDxe.c                | 134 ++------------------
 ArmPlatformPkg/ArmVExpressPkg/ArmVExpressDxe/ArmFvpDxe.inf              |  33 ++---
 ArmPlatformPkg/ArmVExpressPkg/ArmVExpressDxe/ArmVExpressCommon.c        |  48 -------
 ArmPlatformPkg/ArmVExpressPkg/ArmVExpressDxe/ArmVExpressInternal.h      |  52 +-------
 ArmPlatformPkg/ArmVExpressPkg/ArmVExpressPkg.dec                        |  18 ---
 6 files changed, 35 insertions(+), 310 deletions(-)

-- 
2.9.3

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diff --git a/ArmPlatformPkg/ArmVExpressPkg/ArmVExpressDxe/AArch64/ArmFvpDxeAArch64.c b/ArmPlatformPkg/ArmVExpressPkg/ArmVExpressDxe/AArch64/ArmFvpDxeAArch64.c
index c368957dcd3d..fe8e115c97eb 100644
--- a/ArmPlatformPkg/ArmVExpressPkg/ArmVExpressDxe/AArch64/ArmFvpDxeAArch64.c
+++ b/ArmPlatformPkg/ArmVExpressPkg/ArmVExpressDxe/AArch64/ArmFvpDxeAArch64.c
@@ -1,6 +1,7 @@ 
 /** @file
 
   Copyright (c) 2014-2015, ARM Ltd. All rights reserved.
+  Copyright (c) 2017, Linaro Ltd. All rights reserved.
 
   This program and the accompanying materials are licensed and made available
   under the terms and conditions of the BSD License which accompanies this
@@ -15,30 +16,11 @@ 
 #include "ArmVExpressInternal.h"
 #include <Library/ArmGicLib.h>
 
-//
-// Description of the AARCH64 model platforms :
-// Platform ids are defined in ArmVExpressInternal.h for
-// all "ArmVExpress-like" platforms (AARCH64 or ARM architecture,
-// model or hardware platforms).
-//
-CONST ARM_VEXPRESS_PLATFORM ArmVExpressPlatforms[] = {
-  { ARM_FVP_VEXPRESS_AEMv8x4,                  FixedPcdGetPtr (PcdFdtFvpVExpressAEMv8x4),        L"rtsm_ve-aemv8a.dtb"                  },
-  { ARM_FVP_BASE_AEMv8x4_AEMv8x4_GICV2,        FixedPcdGetPtr (PcdFdtFvpBaseAEMv8x4GicV2),       L"fvp-base-gicv2-psci.dtb"             },
-  { ARM_FVP_BASE_AEMv8x4_AEMv8x4_GICV2_LEGACY, FixedPcdGetPtr (PcdFdtFvpBaseAEMv8x4GicV2Legacy), L"fvp-base-gicv2legacy-psci.dtb"       },
-  { ARM_FVP_BASE_AEMv8x4_AEMv8x4_GICV3,        FixedPcdGetPtr (PcdFdtFvpBaseAEMv8x4GicV3),       L"fvp-base-gicv3-psci.dtb"             },
-  { ARM_FVP_FOUNDATION_GICV2,                  FixedPcdGetPtr (PcdFdtFvpFoundationGicV2),        L"fvp-foundation-gicv2-psci.dtb"       },
-  { ARM_FVP_FOUNDATION_GICV2_LEGACY,           FixedPcdGetPtr (PcdFdtFvpFoundationGicV2Legacy),  L"fvp-foundation-gicv2legacy-psci.dtb" },
-  { ARM_FVP_FOUNDATION_GICV3,                  FixedPcdGetPtr (PcdFdtFvpFoundationGicV3),        L"fvp-foundation-gicv3-psci.dtb"       },
-  { ARM_FVP_VEXPRESS_UNKNOWN }
-};
-
 /**
+
   Get information about the VExpress platform the firmware is running on.
 
-  @param[out]  Platform   Address where the pointer to the platform information
-                          (type ARM_VEXPRESS_PLATFORM*) should be stored.
-                          The returned pointer does not point to an allocated
-                          memory area.
+  @param[out]  PlatformId ARM_VEXPRESS_PLATFORM_ID value of current platform
 
   @retval  EFI_SUCCESS    The platform information was returned.
   @retval  EFI_NOT_FOUND  The platform was not recognised.
@@ -46,19 +28,14 @@  CONST ARM_VEXPRESS_PLATFORM ArmVExpressPlatforms[] = {
 **/
 EFI_STATUS
 ArmVExpressGetPlatform (
-  OUT CONST ARM_VEXPRESS_PLATFORM** Platform
+  OUT   ARM_VEXPRESS_PLATFORM_ID    *PlatformId
   )
 {
-  EFI_STATUS            Status;
   UINT32                SysId;
   UINT32                FvpSysId;
   UINT32                VariantSysId;
   ARM_GIC_ARCH_REVISION GicRevision;
 
-  ASSERT (Platform != NULL);
-
-  Status = EFI_NOT_FOUND;
-
   SysId = MmioRead32 (ARM_VE_SYS_ID_REG);
   if (SysId != ARM_RTSM_SYS_ID) {
     // Remove the GIC variant to identify if we are running on the FVP Base or
@@ -70,44 +47,41 @@  ArmVExpressGetPlatform (
 
     if (FvpSysId == ARM_FVP_BASE_BOARD_SYS_ID) {
       if (VariantSysId == ARM_FVP_GIC_VE_MMAP) {
-        // FVP Base Model with legacy GIC memory map
-        Status = ArmVExpressGetPlatformFromId (ARM_FVP_BASE_AEMv8x4_AEMv8x4_GICV2_LEGACY, Platform);
+        // FVP Base Model with legacy GIC memory map -- no longer supported
+        goto NotFound;
       } else {
         GicRevision = ArmGicGetSupportedArchRevision ();
 
         if (GicRevision == ARM_GIC_ARCH_REVISION_2) {
           // FVP Base Model with GICv2 support
-          Status = ArmVExpressGetPlatformFromId (ARM_FVP_BASE_AEMv8x4_AEMv8x4_GICV2, Platform);
+          *PlatformId = ARM_FVP_BASE_AEMv8x4_AEMv8x4_GICV2;
         } else {
           // FVP Base Model with GICv3 support
-          Status = ArmVExpressGetPlatformFromId (ARM_FVP_BASE_AEMv8x4_AEMv8x4_GICV3, Platform);
+          *PlatformId = ARM_FVP_BASE_AEMv8x4_AEMv8x4_GICV3;
         }
       }
     } else if (FvpSysId == ARM_FVP_FOUNDATION_BOARD_SYS_ID) {
       if (VariantSysId == ARM_FVP_GIC_VE_MMAP) {
-        // FVP Foundation Model with legacy GIC memory map
-        Status = ArmVExpressGetPlatformFromId (ARM_FVP_FOUNDATION_GICV2_LEGACY, Platform);
+        // FVP Foundation Model with legacy GIC memory map -- no longer supported
+        goto NotFound;
       } else {
         GicRevision = ArmGicGetSupportedArchRevision ();
 
         if (GicRevision == ARM_GIC_ARCH_REVISION_2) {
           // FVP Foundation Model with GICv2
-          Status = ArmVExpressGetPlatformFromId (ARM_FVP_FOUNDATION_GICV2, Platform);
+          *PlatformId = ARM_FVP_FOUNDATION_GICV2;
         } else {
           // FVP Foundation Model with GICv3
-          Status = ArmVExpressGetPlatformFromId (ARM_FVP_FOUNDATION_GICV3, Platform);
+          *PlatformId = ARM_FVP_FOUNDATION_GICV3;
         }
       }
     }
-  } else {
-    // FVP Versatile Express AEMv8
-    Status = ArmVExpressGetPlatformFromId (ARM_FVP_VEXPRESS_AEMv8x4, Platform);
+    return EFI_SUCCESS;
   }
 
-  if (EFI_ERROR (Status)) {
-    DEBUG ((EFI_D_ERROR, "Unsupported AArch64 RTSM (SysId:0x%X).\n", SysId));
-    ASSERT_EFI_ERROR (Status);
-  }
+NotFound:
+  DEBUG ((EFI_D_ERROR, "Unsupported AArch64 RTSM (SysId:0x%X).\n", SysId));
+  ASSERT_EFI_ERROR (EFI_NOT_FOUND);
 
-  return Status;
+  return EFI_NOT_FOUND;
 }
diff --git a/ArmPlatformPkg/ArmVExpressPkg/ArmVExpressDxe/ArmFvpDxe.c b/ArmPlatformPkg/ArmVExpressPkg/ArmVExpressDxe/ArmFvpDxe.c
index 8c42814a04dc..bf100bbaa822 100644
--- a/ArmPlatformPkg/ArmVExpressPkg/ArmVExpressDxe/ArmFvpDxe.c
+++ b/ArmPlatformPkg/ArmVExpressPkg/ArmVExpressDxe/ArmFvpDxe.c
@@ -55,95 +55,6 @@  VIRTIO_BLK_DEVICE_PATH mVirtioBlockDevicePath =
   }
 };
 
-STATIC
-EFI_STATUS
-InternalFindFdtByGuid (
-  IN OUT   EFI_DEVICE_PATH  **FdtDevicePath,
-  IN CONST EFI_GUID         *FdtGuid
-  )
-{
-  MEDIA_FW_VOL_FILEPATH_DEVICE_PATH    FileDevicePath;
-  EFI_HANDLE                           *HandleBuffer;
-  UINTN                                HandleCount;
-  UINTN                                Index;
-  EFI_FIRMWARE_VOLUME2_PROTOCOL        *FvProtocol;
-  EFI_GUID                             NameGuid;
-  UINTN                                Size;
-  VOID                                 *Key;
-  EFI_FV_FILETYPE                      FileType;
-  EFI_FV_FILE_ATTRIBUTES               Attributes;
-  EFI_DEVICE_PATH                      *FvDevicePath;
-  EFI_STATUS                           Status;
-
-  if (FdtGuid == NULL) {
-    return EFI_NOT_FOUND;
-  }
-
-  EfiInitializeFwVolDevicepathNode (&FileDevicePath, FdtGuid);
-
-  HandleBuffer = NULL;
-  Status = gBS->LocateHandleBuffer (
-                  ByProtocol,
-                  &gEfiFirmwareVolume2ProtocolGuid,
-                  NULL,
-                  &HandleCount,
-                  &HandleBuffer
-                  );
-  if (EFI_ERROR (Status)) {
-    return Status;
-  }
-
-  for (Index = 0; Index < HandleCount; Index++) {
-    Status = gBS->HandleProtocol (
-                    HandleBuffer[Index],
-                    &gEfiFirmwareVolume2ProtocolGuid,
-                    (VOID **) &FvProtocol
-                    );
-    if (EFI_ERROR (Status)) {
-      return Status;
-    }
-
-    // Allocate Key
-    Key = AllocatePool (FvProtocol->KeySize);
-    ASSERT (Key != NULL);
-    ZeroMem (Key, FvProtocol->KeySize);
-
-    do {
-      FileType = EFI_FV_FILETYPE_RAW;
-      Status = FvProtocol->GetNextFile (FvProtocol, Key, &FileType, &NameGuid, &Attributes, &Size);
-      if (Status == EFI_NOT_FOUND) {
-        break;
-      }
-      if (EFI_ERROR (Status)) {
-        return Status;
-      }
-
-      //
-      // Check whether this file is the one we are looking for. If so,
-      // create a device path for it and return it to the caller.
-      //
-      if (CompareGuid (&NameGuid, FdtGuid)) {
-          Status = gBS->HandleProtocol (HandleBuffer[Index], &gEfiDevicePathProtocolGuid, (VOID **)&FvDevicePath);
-          if (!EFI_ERROR (Status)) {
-            *FdtDevicePath = AppendDevicePathNode (FvDevicePath,
-                               (EFI_DEVICE_PATH_PROTOCOL *)&FileDevicePath);
-          }
-          goto Done;
-      }
-    } while (TRUE);
-    FreePool (Key);
-  }
-
-  if (Index == HandleCount) {
-    Status = EFI_NOT_FOUND;
-  }
-  return Status;
-
-Done:
-  FreePool (Key);
-  return Status;
-}
-
 /**
  * Generic UEFI Entrypoint for 'ArmFvpDxe' driver
  * See UEFI specification for the details of the parameters
@@ -155,12 +66,15 @@  ArmFvpInitialise (
   IN EFI_SYSTEM_TABLE   *SystemTable
   )
 {
-  CONST ARM_VEXPRESS_PLATFORM* Platform;
   EFI_STATUS                   Status;
-  CHAR16                       *TextDevicePath;
-  UINTN                        TextDevicePathSize;
-  VOID                         *Buffer;
-  EFI_DEVICE_PATH              *FdtDevicePath;
+  ARM_VEXPRESS_PLATFORM_ID     PlatformId;
+
+  Status = ArmVExpressGetPlatform (&PlatformId);
+  ASSERT_EFI_ERROR (Status);
+
+  if (!EFI_ERROR (Status)) {
+    PcdSet8 (PcdDtPlatformDefaultDtbSectionIndex, (UINT8)PlatformId);
+  }
 
   Status = gBS->InstallProtocolInterface (&ImageHandle,
                  &gEfiDevicePathProtocolGuid, EFI_NATIVE_INTERFACE,
@@ -169,38 +83,6 @@  ArmFvpInitialise (
     return Status;
   }
 
-  Status = ArmVExpressGetPlatform (&Platform);
-  if (!EFI_ERROR (Status)) {
-    FdtDevicePath = NULL;
-    Status = InternalFindFdtByGuid (&FdtDevicePath, Platform->FdtGuid);
-    if (!EFI_ERROR (Status)) {
-      TextDevicePath = ConvertDevicePathToText (FdtDevicePath, FALSE, FALSE);
-      if (TextDevicePath != NULL) {
-        TextDevicePathSize = StrSize (TextDevicePath);
-      }
-      FreePool (FdtDevicePath);
-    } else {
-      TextDevicePathSize  = StrSize ((CHAR16*)PcdGetPtr (PcdFvpFdtDevicePathsBase)) - sizeof (CHAR16);
-      TextDevicePathSize += StrSize (Platform->FdtName);
-
-      TextDevicePath = AllocatePool (TextDevicePathSize);
-      if (TextDevicePath != NULL) {
-        StrCpy (TextDevicePath, ((CHAR16*)PcdGetPtr (PcdFvpFdtDevicePathsBase)));
-        StrCat (TextDevicePath, Platform->FdtName);
-      }
-    }
-    if (TextDevicePath != NULL) {
-      Buffer = PcdSetPtr (PcdFdtDevicePaths, &TextDevicePathSize, TextDevicePath);
-      if (Buffer == NULL) {
-        DEBUG ((
-          EFI_D_ERROR,
-          "ArmFvpDxe: Setting of FDT device path in PcdFdtDevicePaths failed - %r\n", EFI_BUFFER_TOO_SMALL
-          ));
-      }
-      FreePool (TextDevicePath);
-    }
-  }
-
   // Declare the Virtio BlockIo device
   Status = VirtioMmioInstallDevice (ARM_FVP_BASE_VIRTIO_BLOCK_BASE, ImageHandle);
   if (EFI_ERROR (Status)) {
diff --git a/ArmPlatformPkg/ArmVExpressPkg/ArmVExpressDxe/ArmFvpDxe.inf b/ArmPlatformPkg/ArmVExpressPkg/ArmVExpressDxe/ArmFvpDxe.inf
index 2a8c8388a3b2..605ca160391d 100644
--- a/ArmPlatformPkg/ArmVExpressPkg/ArmVExpressDxe/ArmFvpDxe.inf
+++ b/ArmPlatformPkg/ArmVExpressPkg/ArmVExpressDxe/ArmFvpDxe.inf
@@ -22,7 +22,6 @@  [Defines]
 
 [Sources.common]
   ArmFvpDxe.c
-  ArmVExpressCommon.c
 
 [Sources.AARCH64]
   AArch64/ArmFvpDxeAArch64.c
@@ -31,41 +30,25 @@  [Packages]
   MdePkg/MdePkg.dec
   ArmPkg/ArmPkg.dec
   ArmPlatformPkg/ArmPlatformPkg.dec
-  ArmPlatformPkg/ArmVExpressPkg/ArmVExpressPkg.dec
   EmbeddedPkg/EmbeddedPkg.dec
   OvmfPkg/OvmfPkg.dec
 
 [LibraryClasses]
-  PcdLib
+  #ArmLib
+  #ArmPlatformLib
   ArmShellCmdRunAxfLib
-  ArmLib
-  ArmPlatformLib
   BaseMemoryLib
-  DxeServicesTableLib
-  MemoryAllocationLib
+  IoLib
+  PcdLib
   UefiDriverEntryPoint
   UefiBootServicesTableLib
   VirtioMmioDeviceLib
-  DevicePathLib
 
 [LibraryClasses.AARCH64]
   ArmGicLib
 
-[Protocols]
-  gEfiFirmwareVolume2ProtocolGuid
-  gEfiDevicePathProtocolGuid
-
-[FixedPcd]
-  gArmVExpressTokenSpaceGuid.PcdFvpFdtDevicePathsBase
-
-[FixedPcd.AARCH64]
-  gArmVExpressTokenSpaceGuid.PcdFdtFvpVExpressAEMv8x4
-  gArmVExpressTokenSpaceGuid.PcdFdtFvpBaseAEMv8x4GicV2
-  gArmVExpressTokenSpaceGuid.PcdFdtFvpBaseAEMv8x4GicV2Legacy
-  gArmVExpressTokenSpaceGuid.PcdFdtFvpBaseAEMv8x4GicV3
-  gArmVExpressTokenSpaceGuid.PcdFdtFvpFoundationGicV2
-  gArmVExpressTokenSpaceGuid.PcdFdtFvpFoundationGicV2Legacy
-  gArmVExpressTokenSpaceGuid.PcdFdtFvpFoundationGicV3
-
 [Pcd]
-  gEmbeddedTokenSpaceGuid.PcdFdtDevicePaths
+  gEmbeddedTokenSpaceGuid.PcdDtPlatformDefaultDtbSectionIndex
+
+[Depex]
+  BEFORE gDtPlatformDxeFileGuid
diff --git a/ArmPlatformPkg/ArmVExpressPkg/ArmVExpressDxe/ArmVExpressCommon.c b/ArmPlatformPkg/ArmVExpressPkg/ArmVExpressDxe/ArmVExpressCommon.c
deleted file mode 100644
index e1cac7fb3714..000000000000
--- a/ArmPlatformPkg/ArmVExpressPkg/ArmVExpressDxe/ArmVExpressCommon.c
+++ /dev/null
@@ -1,48 +0,0 @@ 
-/** @file
-
-  Copyright (c) 2014, ARM Ltd. All rights reserved.
-
-  This program and the accompanying materials are licensed and made available
-  under the terms and conditions of the BSD License which accompanies this
-  distribution.  The full text of the license may be found at
-  http://opensource.org/licenses/bsd-license.php
-
-  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
-  WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
-
-**/
-
-#include "ArmVExpressInternal.h"
-
-/**
-  Get information about the VExpress platform the firmware is running on given its Id.
-
-  @param[in]   PlatformId  Id of the VExpress platform.
-  @param[out]  Platform    Address where the pointer to the platform information
-                           (type ARM_VEXPRESS_PLATFORM*) should be stored.
-                           The returned pointer does not point to an allocated
-                           memory area.
-
-  @retval  EFI_SUCCESS    The platform information was returned.
-  @retval  EFI_NOT_FOUND  The platform was not recognised.
-
-**/
-EFI_STATUS
-ArmVExpressGetPlatformFromId (
-  IN  CONST ARM_VEXPRESS_PLATFORM_ID PlatformId,
-  OUT CONST ARM_VEXPRESS_PLATFORM**  Platform
-  )
-{
-  UINTN Index;
-
-  ASSERT (Platform != NULL);
-
-  for (Index = 0; ArmVExpressPlatforms[Index].Id != ARM_FVP_VEXPRESS_UNKNOWN; Index++) {
-    if (ArmVExpressPlatforms[Index].Id == PlatformId) {
-      *Platform = &ArmVExpressPlatforms[Index];
-      return EFI_SUCCESS;
-    }
-  }
-
-  return EFI_NOT_FOUND;
-}
diff --git a/ArmPlatformPkg/ArmVExpressPkg/ArmVExpressDxe/ArmVExpressInternal.h b/ArmPlatformPkg/ArmVExpressPkg/ArmVExpressDxe/ArmVExpressInternal.h
index e123eea2d28b..2676f2d4f903 100644
--- a/ArmPlatformPkg/ArmVExpressPkg/ArmVExpressDxe/ArmVExpressInternal.h
+++ b/ArmPlatformPkg/ArmVExpressPkg/ArmVExpressDxe/ArmVExpressInternal.h
@@ -22,70 +22,22 @@ 
 #include <Library/IoLib.h>
 #include <Library/PcdLib.h>
 #include <Library/UefiBootServicesTableLib.h>
-#include <Library/UefiLib.h>
 
 #include <VExpressMotherBoard.h>
 
 // This 'enum' is needed as variations based on existing platform exist
 typedef enum {
-  ARM_FVP_VEXPRESS_UNKNOWN = 0,
-  ARM_FVP_VEXPRESS_A9x4,
-  ARM_FVP_VEXPRESS_A15x1,
-  ARM_FVP_VEXPRESS_A15x2,
-  ARM_FVP_VEXPRESS_A15x4,
-  ARM_FVP_VEXPRESS_A15x1_A7x1,
-  ARM_FVP_VEXPRESS_A15x4_A7x4,
-  ARM_FVP_VEXPRESS_AEMv8x4,
   ARM_FVP_BASE_AEMv8x4_AEMv8x4_GICV2,
-  ARM_FVP_BASE_AEMv8x4_AEMv8x4_GICV2_LEGACY,
   ARM_FVP_BASE_AEMv8x4_AEMv8x4_GICV3,
   ARM_FVP_FOUNDATION_GICV2,
-  ARM_FVP_FOUNDATION_GICV2_LEGACY,
   ARM_FVP_FOUNDATION_GICV3,
-  ARM_HW_A9x4,
-  ARM_HW_A15x2_A7x3,
-  ARM_HW_A15,
-  ARM_HW_A5
 } ARM_VEXPRESS_PLATFORM_ID;
 
-typedef struct {
-  ARM_VEXPRESS_PLATFORM_ID  Id;
-
-  // Flattened Device Tree (FDT) File
-  CONST EFI_GUID            *FdtGuid; /// Name of the FDT when present into the FV
-  CONST CHAR16              *FdtName; /// Name of the FDT when present into a File System
-} ARM_VEXPRESS_PLATFORM;
-
-// Array that contains the list of the VExpress based platform supported by this DXE driver
-extern CONST ARM_VEXPRESS_PLATFORM ArmVExpressPlatforms[];
-
-/**
-  Get information about the VExpress platform the firmware is running on given its Id.
-
-  @param[in]   PlatformId  Id of the VExpress platform.
-  @param[out]  Platform    Address where the pointer to the platform information
-                           (type ARM_VEXPRESS_PLATFORM*) should be stored.
-                           The returned pointer does not point to an allocated
-                           memory area.
-
-  @retval  EFI_SUCCESS    The platform information was returned.
-  @retval  EFI_NOT_FOUND  The platform was not recognised.
-
-**/
-EFI_STATUS
-ArmVExpressGetPlatformFromId (
-  IN  CONST ARM_VEXPRESS_PLATFORM_ID PlatformId,
-  OUT CONST ARM_VEXPRESS_PLATFORM**  Platform
-  );
-
 /**
 
   Get information about the VExpress platform the firmware is running on.
 
-  @param[out]  Platform   Address where the pointer to the platform information
-                          (type ARM_VEXPRESS_PLATFORM*) should be stored.
-                          The returned pointer does not point to an allocated
-                          memory area.
+  @param[out]  PlatformId ARM_VEXPRESS_PLATFORM_ID value of current platform
 
   @retval  EFI_SUCCESS    The platform information was returned.
   @retval  EFI_NOT_FOUND  The platform was not recognised.
@@ -93,7 +45,7 @@  ArmVExpressGetPlatformFromId (
 **/
 EFI_STATUS
 ArmVExpressGetPlatform (
-  OUT CONST ARM_VEXPRESS_PLATFORM** Platform
+  OUT   ARM_VEXPRESS_PLATFORM_ID    *PlatformId
   );
 
 #endif // __ARM_VEXPRESS_INTERNAL_H__
diff --git a/ArmPlatformPkg/ArmVExpressPkg/ArmVExpressPkg.dec b/ArmPlatformPkg/ArmVExpressPkg/ArmVExpressPkg.dec
index 39f046541502..3814513c2241 100644
--- a/ArmPlatformPkg/ArmVExpressPkg/ArmVExpressPkg.dec
+++ b/ArmPlatformPkg/ArmVExpressPkg/ArmVExpressPkg.dec
@@ -51,21 +51,3 @@  [PcdsFixedAtBuild.common]
   # Device path of block device on which Fastboot will flash partitions
   #
   gArmVExpressTokenSpaceGuid.PcdAndroidFastbootNvmDevicePath|""|VOID*|0x00000004
-
-  # FVP platforms : install FDT from SemiHosting
-  gArmVExpressTokenSpaceGuid.PcdFvpFdtDevicePathsBase|L"VenHw(C5B9C74A-6D72-4719-99AB-C59F199091EB)/"|VOID*|0x00000005
-  # HW platforms : install FDT from NOR Flash
-  gArmVExpressTokenSpaceGuid.PcdHwFdtDevicePathsBase|L"VenHw(E7223039-5836-41E1-B542-D7EC736C5E59)/"|VOID*|0x00000006
-
-  #
-  # ARM Versatile Express FDT Guids
-  #
-
-  # AArch64 FVP platforms
-  gArmVExpressTokenSpaceGuid.PcdFdtFvpVExpressAEMv8x4|{ 0xa8, 0x95, 0x5f, 0xf6, 0x32, 0x7b, 0xf3, 0x16, 0x12, 0x32, 0x45, 0x50, 0xbd, 0x54, 0xca, 0xe5 }|VOID*|0x00000010
-  gArmVExpressTokenSpaceGuid.PcdFdtFvpBaseAEMv8x4GicV2|{ 0x66, 0xcf, 0x57, 0xa4, 0xac, 0x7e, 0x7f, 0x3d, 0x21, 0x88, 0x3a, 0x58, 0x3c, 0x27, 0xd7, 0xe8 }|VOID*|0x00000011
-  gArmVExpressTokenSpaceGuid.PcdFdtFvpBaseAEMv8x4GicV2Legacy|{ 0x8b, 0xcb, 0xe0, 0x14, 0xd1, 0x46, 0x79, 0xae, 0x7f, 0x20, 0xcf, 0x84, 0x22, 0xc7, 0x94, 0x4a }|VOID*|0x00000012
-  gArmVExpressTokenSpaceGuid.PcdFdtFvpBaseAEMv8x4GicV3|{ 0x4d, 0x03, 0xb8, 0x77, 0x63, 0x25, 0x0a, 0x7f, 0xe9, 0x72, 0xfa, 0x68, 0x74, 0xc7, 0x5e, 0xb5 }|VOID*|0x00000013
-  gArmVExpressTokenSpaceGuid.PcdFdtFvpFoundationGicV2|{ 0x36, 0x4f, 0x61, 0x92, 0x86, 0xb1, 0xa2, 0x16, 0x32, 0x65, 0x35, 0x3f, 0x01, 0xf3, 0x3b, 0x64 }|VOID*|0x00000014
-  gArmVExpressTokenSpaceGuid.PcdFdtFvpFoundationGicV2Legacy|{ 0xf6, 0xcb, 0x9d, 0x86, 0x38, 0x74, 0x8a, 0xb0, 0xfe, 0x40, 0x08, 0x0f, 0x3f, 0xb3, 0x50, 0x7c }|VOID*|0x00000015
-  gArmVExpressTokenSpaceGuid.PcdFdtFvpFoundationGicV3|{ 0x51, 0xd0, 0x75, 0x6b, 0x9d, 0x35, 0x1b, 0x1b, 0xa6, 0xc6, 0xab, 0xa0, 0x90, 0xf9, 0xf0, 0x0a }|VOID*|0x00000016