Re: [edk2-platforms][PATCH v1 3/3] ClevoOpenBoardPkg/N1xxWU: Write PEI debug messages to SPI flash

["Desimone, Nathaniel L" <nathaniel.l.desimone@intel.com>]

Look's good. I have a couple of comments, but they are not blocking:

1. It would be nice if this library worked more like a circular buffer when erasing previous debug messages from flash. Basically, instead of clearing the entire debug region, only clear 4KB blocks at a time as they are needed. That way you will always have at least NvMessageAreaSize - 4KB worth of debug message to look back when trying to debug issues.

2. It seems like this library would also be useful for other Kaby Lake boards (KabylakeOpenBoardPkg for example) is there any "shared Kaby Lake package" that we could put this in where both could use it?

Reviewed-by: Nate DeSimone <nathaniel.l.desimone@intel.com>

-----Original Message-----
From: Kubacki, Michael A 
Sent: Sunday, March 31, 2019 4:28 PM
To: edk2-devel@lists.01.org
Cc: Sinha, Ankit <ankit.sinha@intel.com>; Desimone, Nathaniel L <nathaniel.l.desimone@intel.com>; Chiu, Chasel <chasel.chiu@intel.com>; Gao, Liming <liming.gao@intel.com>; Kinney, Michael D <michael.d.kinney@intel.com>
Subject: [edk2-platforms][PATCH v1 3/3] ClevoOpenBoardPkg/N1xxWU: Write PEI debug messages to SPI flash

Adds a new SerialPortLib instance to the ClevoOpenBoardPkg to support writing debug messages to a dedicated area on SPI flash. This is to enable closed chassis debug support on the system.

DXE and later phases after memory initialization are expected to use USB debug.

Cc: Ankit Sinha <mailto:ankit.sinha@intel.com>
Cc: Nate DeSimone <mailto:nathaniel.l.desimone@intel.com>
Cc: Chasel Chiu <mailto:chasel.chiu@intel.com>
Cc: Liming Gao <mailto:liming.gao@intel.com>
Cc: Michael D Kinney <mailto:michael.d.kinney@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Michael Kubacki <mailto:michael.a.kubacki@intel.com>
---
 Platform/Intel/ClevoOpenBoardPkg/OpenBoardPkg.dec  |   5 +
 .../ClevoOpenBoardPkg/N1xxWU/OpenBoardPkg.dsc      |  20 +-
 .../ClevoOpenBoardPkg/N1xxWU/OpenBoardPkg.fdf      |   4 +
 .../PeiSerialPortLibSpiFlash.inf                   |  56 ++++
 .../PeiSerialPortLibSpiFlash.c                     | 326 +++++++++++++++++++++
 5 files changed, 407 insertions(+), 4 deletions(-)  create mode 100644 Platform/Intel/ClevoOpenBoardPkg/Library/PeiSerialPortLibSpiFlash/PeiSerialPortLibSpiFlash.inf
 create mode 100644 Platform/Intel/ClevoOpenBoardPkg/Library/PeiSerialPortLibSpiFlash/PeiSerialPortLibSpiFlash.c

diff --git a/Platform/Intel/ClevoOpenBoardPkg/OpenBoardPkg.dec b/Platform/Intel/ClevoOpenBoardPkg/OpenBoardPkg.dec
index 87bbfb2240..aa457e64db 100644
--- a/Platform/Intel/ClevoOpenBoardPkg/OpenBoardPkg.dec
+++ b/Platform/Intel/ClevoOpenBoardPkg/OpenBoardPkg.dec
@@ -30,6 +30,7 @@ Features\Tbt\Include
 [Guids]
 gBoardModuleTokenSpaceGuid            =  {0x72d1fff7, 0xa42a, 0x4219, {0xb9, 0x95, 0x5a, 0x67, 0x53, 0x6e, 0xa4, 0x2a}}
 gTianoLogoGuid                        =  {0x7BB28B99, 0x61BB, 0x11D5, {0x9A, 0x5D, 0x00, 0x90, 0x27, 0x3F, 0xC1, 0x4D}}
+gSpiFlashDebugHobGuid                 =  {0xcaaaf418, 0x38a5, 0x4d49, {0xbe, 0x74, 0xe6, 0x06, 0xe4, 0x02, 0x6d, 0x25}}
 gTbtInfoHobGuid                       =  {0x74a81eaa, 0x033c, 0x4783, {0xbe, 0x2b, 0x84, 0x85, 0x74, 0xa6, 0x97, 0xb7}}
 gPlatformModuleTokenSpaceGuid         =  {0x69d13bf0, 0xaf91, 0x4d96, {0xaa, 0x9f, 0x21, 0x84, 0xc5, 0xce, 0x3b, 0xc0}}
 
@@ -64,6 +65,10 @@ gBoardModuleTokenSpaceGuid.PcdSwSmiDTbtEnumerate|0xF7|UINT8|0x000000110
 
 gBoardModuleTokenSpaceGuid.PcdSmcExtSmiBitPosition|0x01|UINT8|0x90000015
 
+gBoardModuleTokenSpaceGuid.PcdFlashNvDebugMessageBase|0x00000000|UINT32
+|0x90000030
+gBoardModuleTokenSpaceGuid.PcdFlashNvDebugMessageSize|0x00000000|UINT32
+|0x90000031
+gBoardModuleTokenSpaceGuid.PcdFlashNvDebugMessageOffset|0x00000000|UINT
+32|0x90000032
+
 [PcdsDynamic]
 
 # Board GPIO Table
diff --git a/Platform/Intel/ClevoOpenBoardPkg/N1xxWU/OpenBoardPkg.dsc b/Platform/Intel/ClevoOpenBoardPkg/N1xxWU/OpenBoardPkg.dsc
index 2116c48fc0..c43a30de34 100644
--- a/Platform/Intel/ClevoOpenBoardPkg/N1xxWU/OpenBoardPkg.dsc
+++ b/Platform/Intel/ClevoOpenBoardPkg/N1xxWU/OpenBoardPkg.dsc
@@ -116,10 +116,18 @@
 #
 !include $(PLATFORM_SI_PACKAGE)/SiPkgCommonLib.dsc
 
+[LibraryClasses.IA32.SEC]
+  
+SerialPortLib|MdePkg/Library/BaseSerialPortLibNull/BaseSerialPortLibNul
+l.inf
+  DebugLib|MdePkg/Library/BaseDebugLibNull/BaseDebugLibNull.inf
+  
+TestPointCheckLib|$(PLATFORM_PACKAGE)/Test/Library/TestPointCheckLib/Se
+cTestPointCheckLib.inf
+  
+SecBoardInitLib|$(PLATFORM_PACKAGE)/PlatformInit/Library/SecBoardInitLi
+bNull/SecBoardInitLibNull.inf
+
 [LibraryClasses.IA32]
   #
   # PEI phase common
   #
+  
+ SerialPortLib|$(PLATFORM_BOARD_PACKAGE)/Library/PeiSerialPortLibSpiFla
+ sh/PeiSerialPortLibSpiFlash.inf  
+ DebugLib|MdeModulePkg/Library/PeiDxeDebugLibReportStatusCode/PeiDxeDeb
+ ugLibReportStatusCode.inf
   FspWrapperPlatformLib|$(PLATFORM_PACKAGE)/FspWrapper/Library/PeiFspWrapperPlatformLib/PeiFspWrapperPlatformLib.inf
 !if $(TARGET) == DEBUG
   TestPointCheckLib|$(PLATFORM_PACKAGE)/Test/Library/TestPointCheckLib/PeiTestPointCheckLib.inf
@@ -138,10 +146,6 @@
 #
 !include $(PLATFORM_SI_PACKAGE)/SiPkgPeiLib.dsc
 
-[LibraryClasses.IA32.SEC]
-  TestPointCheckLib|$(PLATFORM_PACKAGE)/Test/Library/TestPointCheckLib/SecTestPointCheckLib.inf
-  SecBoardInitLib|$(PLATFORM_PACKAGE)/PlatformInit/Library/SecBoardInitLibNull/SecBoardInitLibNull.inf
-
 [LibraryClasses.X64]
   #
   # DXE phase common
@@ -185,6 +189,14 @@
 #
 !include $(PLATFORM_PACKAGE)/Include/Dsc/CorePeiInclude.dsc
 
+  #
+  # Core
+  #
+  MdeModulePkg/Universal/StatusCodeHandler/Pei/StatusCodeHandlerPei.inf {
+    <LibraryClasses>
+      DebugLib|MdePkg/Library/BaseDebugLibNull/BaseDebugLibNull.inf
+  }
+
   #
   # FSP wrapper SEC Core
   #
diff --git a/Platform/Intel/ClevoOpenBoardPkg/N1xxWU/OpenBoardPkg.fdf b/Platform/Intel/ClevoOpenBoardPkg/N1xxWU/OpenBoardPkg.fdf
index 95c1758ff3..7f3e965c75 100644
--- a/Platform/Intel/ClevoOpenBoardPkg/N1xxWU/OpenBoardPkg.fdf
+++ b/Platform/Intel/ClevoOpenBoardPkg/N1xxWU/OpenBoardPkg.fdf
@@ -136,6 +136,10 @@ gMinPlatformPkgTokenSpaceGuid.PcdFlashNvStorageFtwSpareOffset|gEfiMdeModulePkgTo
 gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwSpareBase|gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwSpareSize
 #NV_FTW_SPARE
 
+gBoardModuleTokenSpaceGuid.PcdFlashNvDebugMessageOffset|gBoardModuleTok
+enSpaceGuid.PcdFlashNvDebugMessageSize
+gBoardModuleTokenSpaceGuid.PcdFlashNvDebugMessageBase|gBoardModuleToken
+SpaceGuid.PcdFlashNvDebugMessageSize
+#DEBUG_MESSAGE_AREA
+
 gMinPlatformPkgTokenSpaceGuid.PcdFlashFvAdvancedOffset|gMinPlatformPkgTokenSpaceGuid.PcdFlashFvAdvancedSize
 gMinPlatformPkgTokenSpaceGuid.PcdFlashFvAdvancedBase|gMinPlatformPkgTokenSpaceGuid.PcdFlashFvAdvancedSize
 FV = FvAdvanced
diff --git a/Platform/Intel/ClevoOpenBoardPkg/Library/PeiSerialPortLibSpiFlash/PeiSerialPortLibSpiFlash.inf b/Platform/Intel/ClevoOpenBoardPkg/Library/PeiSerialPortLibSpiFlash/PeiSerialPortLibSpiFlash.inf
new file mode 100644
index 0000000000..c22201e033
--- /dev/null
+++ b/Platform/Intel/ClevoOpenBoardPkg/Library/PeiSerialPortLibSpiFlash/
+++ PeiSerialPortLibSpiFlash.inf
@@ -0,0 +1,56 @@
+### @file
+# Component description file for Serial I/O Port library to write to SPI flash.
+#
+# Copyright (c) 2019, Intel Corporation. All rights reserved.<BR> # # 
+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.
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = PeiSerialPortLibFlash
+  FILE_GUID                      = 35A3BA89-04BE-409C-A3CA-DEF6B510F80F
+  VERSION_STRING                 = 1.1
+  MODULE_TYPE                    = PEIM
+  LIBRARY_CLASS                  = SerialPortLib|PEIM PEI_CORE
+#
+# The following information is for reference only and not required by the build tools.
+#
+# VALID_ARCHITECTURES = IA32 X64 IPF
+#
+
+[LibraryClasses]
+  BaseLib
+  BaseMemoryLib
+  HobLib
+  PcdLib
+  PeiServicesLib
+  SpiLib
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  MinPlatformPkg/MinPlatformPkg.dec
+  KabylakeSiliconPkg/SiPkg.dec
+  ClevoOpenBoardPkg/OpenBoardPkg.dec
+
+[Sources]
+  PeiSerialPortLibSpiFlash.c
+
+[Ppis]
+  gPchSpiPpiGuid
+
+[Guids]
+  gSpiFlashDebugHobGuid
+
+[Pcd]
+  gMinPlatformPkgTokenSpaceGuid.PcdFlashAreaBaseAddress           ## CONSUMES
+  gBoardModuleTokenSpaceGuid.PcdFlashNvDebugMessageBase           ## CONSUMES
+  gBoardModuleTokenSpaceGuid.PcdFlashNvDebugMessageSize           ## CONSUMES
diff --git a/Platform/Intel/ClevoOpenBoardPkg/Library/PeiSerialPortLibSpiFlash/PeiSerialPortLibSpiFlash.c b/Platform/Intel/ClevoOpenBoardPkg/Library/PeiSerialPortLibSpiFlash/PeiSerialPortLibSpiFlash.c
new file mode 100644
index 0000000000..e36ff8bff8
--- /dev/null
+++ b/Platform/Intel/ClevoOpenBoardPkg/Library/PeiSerialPortLibSpiFlash/
+++ PeiSerialPortLibSpiFlash.c
@@ -0,0 +1,326 @@
+/** @file
+  Serial I/O Port library implementation for output to SPI flash
+
+Copyright (c) 2019, Intel Corporation. All rights reserved.<BR> This 
+program and the accompanying materials are licensed and made available 
+under the terms and conditions of the BSD License that 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 <Base.h>
+#include <Ppi/Spi.h>
+#include <Library/BaseLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/HobLib.h>
+#include <Library/PcdLib.h>
+#include <Library/PeiServicesLib.h>
+#include <Library/SerialPortLib.h>
+#include <Library/SpiLib.h>
+
+typedef struct {
+  PCH_SPI_PPI           *PchSpiPpi;
+  UINT32                CurrentWriteOffset;
+} SPI_FLASH_DEBUG_CONTEXT;
+
+/**
+  Update reference to the most recent PCH SPI PPI installed
+
+  @param PeiServices       An indirect pointer to the EFI_PEI_SERVICES table published by the PEI Foundation
+  @param NotifyDescriptor  Address of the notification descriptor data structure.
+  @param Ppi               Address of the PPI that was installed.
+
+  @retval EFI_SUCCESS      Successfully update the PCH SPI PPI reference
+  @retval EFI_NOT_FOUND    An error occurred locating a required interface
+  @retval EFI_NOT_SUPPORTED
+
+**/
+EFI_STATUS
+EFIAPI
+SpiPpiNotifyCallback (
+  IN EFI_PEI_SERVICES           **PeiServices,
+  IN EFI_PEI_NOTIFY_DESCRIPTOR  *NotifyDescriptor,
+  IN VOID                       *Ppi
+  )
+{
+  EFI_STATUS                Status;
+  EFI_HOB_GUID_TYPE         *GuidHob;
+  PCH_SPI_PPI               *PchSpiPpi;
+  SPI_FLASH_DEBUG_CONTEXT   *Context;
+
+  GuidHob = GetFirstGuidHob (&gSpiFlashDebugHobGuid);  if (GuidHob == 
+ NULL) {
+    return EFI_NOT_FOUND;
+  }
+  Context = GET_GUID_HOB_DATA (GuidHob);
+
+  Status =  PeiServicesLocatePpi (
+              &gPchSpiPpiGuid,
+              0,
+              NULL,
+              (VOID **) &PchSpiPpi
+              );
+  if (EFI_ERROR (Status)) {
+    return EFI_NOT_FOUND;
+  }
+
+  Context->PchSpiPpi = PchSpiPpi;
+
+  return EFI_SUCCESS;
+}
+
+EFI_PEI_NOTIFY_DESCRIPTOR mSpiPpiNotifyList[] = {
+  {
+    (EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
+    &gPchSpiPpiGuid,
+    SpiPpiNotifyCallback
+  }
+};
+
+/**
+  Common function to write trace data to a chosen debug interface like
+  UART Serial device, USB Serial device or Trace Hub device
+
+  @param  Buffer           Point of data buffer which need to be writed.
+  @param  NumberOfBytes    Number of output bytes which are cached in Buffer.
+
+**/
+UINTN
+EFIAPI
+SerialPortWrite (
+  IN UINT8     *Buffer,
+  IN UINTN     NumberOfBytes
+  )
+{
+  EFI_STATUS                Status;
+  EFI_HOB_GUID_TYPE         *GuidHob;
+  SPI_FLASH_DEBUG_CONTEXT   *Context;
+  UINT32                    BytesWritten;
+  UINT32                    SourceBufferOffset;
+  UINT32                    NvMessageAreaSize;
+  UINT32                    LinearOffset;
+
+  BytesWritten       = NumberOfBytes;
+  SourceBufferOffset = 0;
+
+  NvMessageAreaSize = (UINT32) FixedPcdGet32 
+ (PcdFlashNvDebugMessageSize);
+
+  if (NumberOfBytes == 0 || NvMessageAreaSize == 0) {
+    return 0;
+  }
+  GuidHob = GetFirstGuidHob (&gSpiFlashDebugHobGuid);  if (GuidHob == 
+ NULL) {
+    return 0;
+  }
+  Context = GET_GUID_HOB_DATA (GuidHob);  if (Context == NULL || 
+ Context->PchSpiPpi == NULL || Context->CurrentWriteOffset >= NvMessageAreaSize) {
+    return 0;
+  }
+
+  if ((Context->CurrentWriteOffset + NumberOfBytes) / NvMessageAreaSize > 0) {
+    LinearOffset = (UINT32) (FixedPcdGet32 (PcdFlashNvDebugMessageBase) - FixedPcdGet32 (PcdFlashAreaBaseAddress));
+    Status =  Context->PchSpiPpi->FlashErase (
+                                    Context->PchSpiPpi,
+                                    FlashRegionBios,
+                                    LinearOffset,
+                                    NvMessageAreaSize
+                                    );
+    if (!EFI_ERROR (Status)) {
+      Context->CurrentWriteOffset = 0;
+    } else {
+      return 0;
+    }
+  }
+
+  if (NumberOfBytes > NvMessageAreaSize) {
+    BytesWritten = NvMessageAreaSize;
+    SourceBufferOffset = NumberOfBytes - NvMessageAreaSize;  }
+
+  LinearOffset = (FixedPcdGet32 (PcdFlashNvDebugMessageBase) + 
+ Context->CurrentWriteOffset) - FixedPcdGet32 
+ (PcdFlashAreaBaseAddress);
+
+  Status =  Context->PchSpiPpi->FlashWrite (
+                                  Context->PchSpiPpi,
+                                  FlashRegionBios,
+                                  LinearOffset,
+                                  BytesWritten,
+                                  (UINT8 *) &Buffer[SourceBufferOffset]
+                                  );
+  if (!EFI_ERROR (Status)) {
+    Context->CurrentWriteOffset += BytesWritten;
+    return BytesWritten;
+  }
+
+  return 0;
+}
+
+/**
+  Common function to Read data from UART serial device, USB serial device and save the datas in buffer.
+
+  @param  Buffer           Point of data buffer which need to be writed.
+  @param  NumberOfBytes    Number of output bytes which are cached in Buffer.
+
+  @retval 0                Read data failed, no data is to be read.
+  @retval >0               Actual number of bytes read from debug device.
+
+**/
+UINTN
+EFIAPI
+SerialPortRead (
+  OUT UINT8     *Buffer,
+  IN  UINTN     NumberOfBytes
+)
+{
+  return 0;
+}
+
+/**
+  Polls a serial device to see if there is any data waiting to be read.
+
+  Polls a serial device to see if there is any data waiting to be read.
+  If there is data waiting to be read from the serial device, then TRUE is returned.
+  If there is no data waiting to be read from the serial device, then FALSE is returned.
+
+  @retval TRUE             Data is waiting to be read from the serial device.
+  @retval FALSE            There is no data waiting to be read from the serial device.
+
+**/
+BOOLEAN
+EFIAPI
+SerialPortPoll (
+  VOID
+  )
+{
+  return FALSE;
+}
+
+/**
+  Sets the control bits on a serial device.
+
+  @param Control                Sets the bits of Control that are settable.
+
+  @retval RETURN_SUCCESS        The new control bits were set on the serial device.
+  @retval RETURN_UNSUPPORTED    The serial device does not support this operation.
+  @retval RETURN_DEVICE_ERROR   The serial device is not functioning correctly.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortSetControl (
+  IN UINT32 Control
+  )
+{
+  return EFI_UNSUPPORTED;
+}
+
+/**
+  Retrieve the status of the control bits on a serial device.
+
+  @param Control                A pointer to return the current control signals from the serial device.
+
+  @retval RETURN_SUCCESS        The control bits were read from the serial device.
+  @retval RETURN_UNSUPPORTED    The serial device does not support this operation.
+  @retval RETURN_DEVICE_ERROR   The serial device is not functioning correctly.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortGetControl (
+  OUT UINT32 *Control
+  )
+{
+  return EFI_UNSUPPORTED;
+}
+
+/**
+  Sets the baud rate, receive FIFO depth, transmit/receice time out, 
+parity,
+  data bits, and stop bits on a serial device.
+
+  @param BaudRate           The requested baud rate. A BaudRate value of 0 will use the
+                            device's default interface speed.
+                            On output, the value actually set.
+  @param ReveiveFifoDepth   The requested depth of the FIFO on the receive side of the
+                            serial interface. A ReceiveFifoDepth value of 0 will use
+                            the device's default FIFO depth.
+                            On output, the value actually set.
+  @param Timeout            The requested time out for a single character in microseconds.
+                            This timeout applies to both the transmit and receive side of the
+                            interface. A Timeout value of 0 will use the device's default time
+                            out value.
+                            On output, the value actually set.
+  @param Parity             The type of parity to use on this serial device. A Parity value of
+                            DefaultParity will use the device's default parity value.
+                            On output, the value actually set.
+  @param DataBits           The number of data bits to use on the serial device. A DataBits
+                            vaule of 0 will use the device's default data bit setting.
+                            On output, the value actually set.
+  @param StopBits           The number of stop bits to use on this serial device. A StopBits
+                            value of DefaultStopBits will use the device's default number of
+                            stop bits.
+                            On output, the value actually set.
+
+  @retval RETURN_SUCCESS            The new attributes were set on the serial device.
+  @retval RETURN_UNSUPPORTED        The serial device does not support this operation.
+  @retval RETURN_INVALID_PARAMETER  One or more of the attributes has an unsupported value.
+  @retval RETURN_DEVICE_ERROR       The serial device is not functioning correctly.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortSetAttributes (
+  IN OUT UINT64             *BaudRate,
+  IN OUT UINT32             *ReceiveFifoDepth,
+  IN OUT UINT32             *Timeout,
+  IN OUT EFI_PARITY_TYPE    *Parity,
+  IN OUT UINT8              *DataBits,
+  IN OUT EFI_STOP_BITS_TYPE *StopBits
+  )
+{
+  return EFI_UNSUPPORTED;
+}
+
+/**
+  Initialize the serial device hardware.
+
+  If no initialization is required, then return RETURN_SUCCESS.
+  If the serial device was successfully initialized, then return RETURN_SUCCESS.
+  If the serial device could not be initialized, then return RETURN_DEVICE_ERROR.
+
+  @retval RETURN_SUCCESS        The serial device was initialized.
+  @retval RETURN_DEVICE_ERROR   The serial device could not be initialized.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortInitialize (
+  VOID
+  )
+{
+  EFI_STATUS                Status;
+  SPI_FLASH_DEBUG_CONTEXT   *Context;
+
+  Context = (SPI_FLASH_DEBUG_CONTEXT *) BuildGuidHob 
+ (&gSpiFlashDebugHobGuid, sizeof (SPI_FLASH_DEBUG_CONTEXT));  if (Context == NULL) {
+    return EFI_DEVICE_ERROR;
+  }
+  ZeroMem ((VOID *) Context, sizeof (SPI_FLASH_DEBUG_CONTEXT));
+
+  Status = PeiServicesNotifyPpi (&mSpiPpiNotifyList[0]);  if (EFI_ERROR 
+ (Status)) {
+    return EFI_DEVICE_ERROR;
+  }
+
+  //
+  // Perform silicon specific initialization required to enable write to SPI flash.
+  //
+  Status = SpiServiceInit ();
+  if (EFI_ERROR (Status)) {
+    Status = EFI_DEVICE_ERROR;
+  }
+
+  return Status;
+}
--
2.16.2.windows.1