Browse Source

PurleyOpenBoardPkg : Support for LINUX Boot

Support for LINUX Boot
To enable/disable feature, PcdLinuxBootEnable can be used
 1.	Follow directions on http://osresearch.net/Building/ to compile the heads kernel and initrd for qemu-system_x86_64
 2.	Copy the following built files
(1) initrd.cpio.xz  to PurleyOpenBoardPkg/Features/LinuxBoot/LinuxBinaries/initrd.cpio.xz
(2) bzimage to PurleyOpenBoardPkg/Features/LinuxBoot/LinuxBinaries/linux.efi

Notes:
    V2 :
    - Rename LinuxBootPkg to LinuxBoot
    - Move LinuxBootPkg to PurleyOpenBoardPkg/Features/LinuxBoot
	- Follow Coding Standard in LinuxBoot.C and LinuxBoot.h

Cc: Isaac Oram <isaac.w.oram@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Felix Polyudov <Felixp@ami.com>
Cc: Harikrishna Doppalapudi <harikrishnad@ami.com>
Cc: Manish Jha <manishj@ami.com>
Cc: Zachary Bobroff <zacharyb@ami.com>
Signed-off-by: Manickavasakam Karpagavinayagam <manickavasakamk@ami.com>
Reviewed-by: Isaac Oram <isaac.w.oram@intel.com>
Reviewed-by: Nate DeSimone <nathaniel.l.desimone@intel.com>
Manickavasakam Karpagavinayagam 2 years ago
parent
commit
06b6e5e25d

+ 4 - 1
Platform/Intel/PurleyOpenBoardPkg/BoardTiogaPass/CoreDxeInclude.dsc

@@ -83,6 +83,7 @@
   $(PLATFORM_BOARD_PACKAGE)/Override/MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf
 #TiogaPass Override END
 
+!if gPlatformTokenSpaceGuid.PcdLinuxBootEnable == FALSE
   MdeModulePkg/Bus/Pci/SataControllerDxe/SataControllerDxe.inf
   MdeModulePkg/Bus/Ata/AtaBusDxe/AtaBusDxe.inf
   MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AtaAtapiPassThru.inf
@@ -97,10 +98,11 @@
   MdeModulePkg/Universal/Disk/PartitionDxe/PartitionDxe.inf
   MdeModulePkg/Universal/Disk/UnicodeCollation/EnglishDxe/EnglishDxe.inf
   FatPkg/EnhancedFatDxe/Fat.inf
-
+!endif
   #MdeModulePkg/Universal/Console/GraphicsOutputDxe/GraphicsOutputDxe.inf
   MdeModulePkg/Universal/Console/GraphicsConsoleDxe/GraphicsConsoleDxe.inf
 
+!if gPlatformTokenSpaceGuid.PcdLinuxBootEnable == FALSE
   MdeModulePkg/Universal/Console/ConPlatformDxe/ConPlatformDxe.inf
   MdeModulePkg/Universal/Console/ConSplitterDxe/ConSplitterDxe.inf
 
@@ -124,6 +126,7 @@
     <LibraryClasses>
       PcdLib|MdePkg/Library/DxePcdLib/DxePcdLib.inf
   }
+!endif
 
 !if gMinPlatformPkgTokenSpaceGuid.PcdBootToShellOnly == FALSE
   MdeModulePkg/Core/PiSmmCore/PiSmmIpl.inf

+ 4 - 1
Platform/Intel/PurleyOpenBoardPkg/BoardTiogaPass/CoreUefiBootInclude.fdf

@@ -47,6 +47,7 @@ INF  PcAtChipsetPkg/HpetTimerDxe/HpetTimerDxe.inf
  INF  $(PLATFORM_BOARD_PACKAGE)/Override/MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf
 #TiogaPass Override END
 
+!if gPlatformTokenSpaceGuid.PcdLinuxBootEnable == FALSE
 INF  MdeModulePkg/Bus/Pci/SataControllerDxe/SataControllerDxe.inf
 INF  MdeModulePkg/Bus/Ata/AtaBusDxe/AtaBusDxe.inf
 INF  MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AtaAtapiPassThru.inf
@@ -62,10 +63,12 @@ INF  MdeModulePkg/Universal/Disk/DiskIoDxe/DiskIoDxe.inf
 INF  MdeModulePkg/Universal/Disk/PartitionDxe/PartitionDxe.inf
 INF  MdeModulePkg/Universal/Disk/UnicodeCollation/EnglishDxe/EnglishDxe.inf
 INF  FatPkg/EnhancedFatDxe/Fat.inf
+!endif
 
 #INF  MdeModulePkg/Universal/Console/GraphicsOutputDxe/GraphicsOutputDxe.inf
 INF  MdeModulePkg/Universal/Console/GraphicsConsoleDxe/GraphicsConsoleDxe.inf
 
+!if gPlatformTokenSpaceGuid.PcdLinuxBootEnable == FALSE
 INF  MdeModulePkg/Universal/Console/ConPlatformDxe/ConPlatformDxe.inf
 INF  MdeModulePkg/Universal/Console/ConSplitterDxe/ConSplitterDxe.inf
 
@@ -79,4 +82,4 @@ INF  MdeModulePkg/Universal/DisplayEngineDxe/DisplayEngineDxe.inf
 
 INF  MdeModulePkg/Application/UiApp/UiApp.inf
 INF  MdeModulePkg/Application/BootManagerMenuApp/BootManagerMenuApp.inf
-
+!endif

+ 7 - 0
Platform/Intel/PurleyOpenBoardPkg/BoardTiogaPass/OpenBoardPkg.dsc

@@ -104,6 +104,13 @@
 ################################################################################
 
 [LibraryClasses.common]
+!if gPlatformTokenSpaceGuid.PcdLinuxBootEnable == TRUE
+  LinuxBootLib|$(PLATFORM_BOARD_PACKAGE)/Features/LinuxBoot/LinuxBoot.inf
+  LoadLinuxLib|OvmfPkg/Library/LoadLinuxLib/LoadLinuxLib.inf
+!else
+  LinuxBootLib|$(PLATFORM_BOARD_PACKAGE)/Features/LinuxBoot/LinuxBootNull.inf
+!endif 
+
 !if gPlatformTokenSpaceGuid.PcdFastBoot == FALSE
   PlatformBootManagerLib|$(PLATFORM_PACKAGE)/Bds/Library/DxePlatformBootManagerLib/DxePlatformBootManagerLib.inf
 !else

+ 51 - 6
Platform/Intel/PurleyOpenBoardPkg/BoardTiogaPass/OpenBoardPkg.fdf

@@ -19,6 +19,38 @@
 #       Also all values will have a PCD assigned so that they can be used in the system, and
 #       the FlashMap edit tool can be used to change the values here, without effecting the code.
 #       This requires all code to only use the PCD tokens to recover the values.
+!if gPlatformTokenSpaceGuid.PcdLinuxBootEnable == TRUE
+
+SET gMinPlatformPkgTokenSpaceGuid.PcdFlashFvAdvancedOffset          = 0x00000000  # Flash addr (0xFF840000)
+SET gMinPlatformPkgTokenSpaceGuid.PcdFlashFvAdvancedSize            = 0x00300000  #
+SET gMinPlatformPkgTokenSpaceGuid.PcdFlashFvSecurityOffset          = 0x00300000  # Flash addr (0xFF8A0000)
+SET gMinPlatformPkgTokenSpaceGuid.PcdFlashFvSecuritySize            = 0x00100000  #
+SET gMinPlatformPkgTokenSpaceGuid.PcdFlashFvOsBootOffset            = 0x00400000  # Flash addr (0xFF910000)
+SET gMinPlatformPkgTokenSpaceGuid.PcdFlashFvOsBootSize              = 0x00100000  #
+SET gMinPlatformPkgTokenSpaceGuid.PcdFlashFvFspUOffset              = 0x00500000  # Flash addr (0xFFE00000)
+SET gMinPlatformPkgTokenSpaceGuid.PcdFlashFvFspUSize                = 0x00100000  #
+SET gMinPlatformPkgTokenSpaceGuid.PcdFlashFvUefiBootOffset          = 0x00600000  # Flash addr (0xFF9A0000)
+SET gMinPlatformPkgTokenSpaceGuid.PcdFlashFvUefiBootSize            = 0x00600000  #
+SET gMinPlatformPkgTokenSpaceGuid.PcdFlashNvStorageVariableOffset   = 0x00C00000  # Flash addr (0xFF800000)
+SET gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableSize    = 0x0007C000  #
+
+!else
+
+SET gMinPlatformPkgTokenSpaceGuid.PcdFlashFvAdvancedOffset          = 0x00000000  # Flash addr (0xFF840000)
+SET gMinPlatformPkgTokenSpaceGuid.PcdFlashFvAdvancedSize            = 0x00500000  #
+SET gMinPlatformPkgTokenSpaceGuid.PcdFlashFvSecurityOffset          = 0x00500000  # Flash addr (0xFF8A0000)
+SET gMinPlatformPkgTokenSpaceGuid.PcdFlashFvSecuritySize            = 0x00100000  #
+SET gMinPlatformPkgTokenSpaceGuid.PcdFlashFvOsBootOffset            = 0x00600000  # Flash addr (0xFF910000)
+SET gMinPlatformPkgTokenSpaceGuid.PcdFlashFvOsBootSize              = 0x00100000  #
+SET gMinPlatformPkgTokenSpaceGuid.PcdFlashFvFspUOffset              = 0x00700000  # Flash addr (0xFFE00000)
+SET gMinPlatformPkgTokenSpaceGuid.PcdFlashFvFspUSize                = 0x00200000  #
+SET gMinPlatformPkgTokenSpaceGuid.PcdFlashFvUefiBootOffset          = 0x00900000  # Flash addr (0xFF9A0000)
+SET gMinPlatformPkgTokenSpaceGuid.PcdFlashFvUefiBootSize            = 0x00300000  #
+SET gMinPlatformPkgTokenSpaceGuid.PcdFlashNvStorageVariableOffset   = 0x00C00000  # Flash addr (0xFF800000)
+SET gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableSize    = 0x0007C000  #
+
+!endif
+
 
 [FD.Platform]
 BaseAddress   = 0xFF000000     | gEfiPchTokenSpaceGuid.PcdFlashAreaBaseAddress
@@ -27,27 +59,27 @@ ErasePolarity = 1
 BlockSize     = 0x10000
 NumBlocks     = 0x100
 
-0x00000000|0x00500000
+gMinPlatformPkgTokenSpaceGuid.PcdFlashFvAdvancedOffset|gMinPlatformPkgTokenSpaceGuid.PcdFlashFvAdvancedSize
 gMinPlatformPkgTokenSpaceGuid.PcdFlashFvAdvancedBase|gMinPlatformPkgTokenSpaceGuid.PcdFlashFvAdvancedSize
 FV = FvAdvanced
 
-0x00500000|0x00100000
+gMinPlatformPkgTokenSpaceGuid.PcdFlashFvSecurityOffset|gMinPlatformPkgTokenSpaceGuid.PcdFlashFvSecuritySize
 gMinPlatformPkgTokenSpaceGuid.PcdFlashFvSecurityBase|gMinPlatformPkgTokenSpaceGuid.PcdFlashFvSecuritySize
 FV = FvSecurity
 
-0x00600000|0x00100000
+gMinPlatformPkgTokenSpaceGuid.PcdFlashFvOsBootOffset|gMinPlatformPkgTokenSpaceGuid.PcdFlashFvOsBootSize
 gMinPlatformPkgTokenSpaceGuid.PcdFlashFvOsBootBase|gMinPlatformPkgTokenSpaceGuid.PcdFlashFvOsBootSize
 FV = FvOsBoot
 
-0x00700000|0x00200000
+gMinPlatformPkgTokenSpaceGuid.PcdFlashFvFspUOffset|gMinPlatformPkgTokenSpaceGuid.PcdFlashFvFspUSize
 gMinPlatformPkgTokenSpaceGuid.PcdFlashFvFspUBase|gMinPlatformPkgTokenSpaceGuid.PcdFlashFvFspUSize
 FV = FvLateSiliconCompressed
 
-0x00900000|0x00300000
+gMinPlatformPkgTokenSpaceGuid.PcdFlashFvUefiBootOffset|gMinPlatformPkgTokenSpaceGuid.PcdFlashFvUefiBootSize
 gMinPlatformPkgTokenSpaceGuid.PcdFlashFvUefiBootBase|gMinPlatformPkgTokenSpaceGuid.PcdFlashFvUefiBootSize
 FV = FvUefiBoot
 
-0x00C00000|0x0007C000
+gMinPlatformPkgTokenSpaceGuid.PcdFlashNvStorageVariableOffset|gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableSize
 gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableBase|gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableSize
 #NV_VARIABLE_STORE
 DATA = {
@@ -303,6 +335,19 @@ FILE DRIVER = db90bb7e-e4ba-4f07-96d6-b7076713bd2c {
 
 INF  MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpressDxe.inf
 
+!if gPlatformTokenSpaceGuid.PcdLinuxBootEnable == TRUE
+
+FILE DRIVER = 81339b04-fa8c-4be0-9ca7-916fc5319eb5 {
+    SECTION DXE_DEPEX_EXP = {FALSE}
+    SECTION PE32 = $(PLATFORM_BOARD_PACKAGE)/Features/LinuxBoot/LinuxBinaries/linux.efi
+}
+
+FILE FREEFORM = 16b60e5d-f1c5-42f0-9b34-08C81C430473 {
+  SECTION RAW = $(PLATFORM_BOARD_PACKAGE)/Features/LinuxBoot/LinuxBinaries/initrd.cpio.xz
+}
+
+!endif
+
 
 [FV.FvUefiBoot]
 FvAlignment        = 16

+ 7 - 0
Platform/Intel/PurleyOpenBoardPkg/BoardTiogaPass/PlatformPkgConfig.dsc

@@ -51,7 +51,14 @@
 
   gMinPlatformPkgTokenSpaceGuid.PcdPerformanceEnable|TRUE
 
+  gPlatformTokenSpaceGuid.PcdLinuxBootEnable|FALSE
+
+!if gPlatformTokenSpaceGuid.PcdLinuxBootEnable == TRUE
+  gPlatformTokenSpaceGuid.PcdFastBoot|TRUE
+!else
   gPlatformTokenSpaceGuid.PcdFastBoot|FALSE
+!endif
+
 !if gPlatformTokenSpaceGuid.PcdFastBoot == TRUE
   gIpmiFeaturePkgTokenSpaceGuid.PcdIpmiFeatureEnable|FALSE
   gPlatformTokenSpaceGuid.PcdUpdateConsoleInBds|FALSE

+ 17 - 0
Platform/Intel/PurleyOpenBoardPkg/Features/LinuxBoot/LinuxBinaries/LinuxKernel.inf

@@ -0,0 +1,17 @@
+## @file
+#
+# Copyright (c) 2021, American Megatrends International LLC.<BR>
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 1.27
+  BASE_NAME                      = LinuxKernel
+  FILE_GUID                      = 81339b04-fa8c-4be0-9ca7-916fc5319eb5
+  MODULE_TYPE                    = UEFI_DRIVER
+  VERSION_STRING                 = 1.0
+
+[Binaries.common.AARCH64]
+  PE32|linux.efi|*

BIN
Platform/Intel/PurleyOpenBoardPkg/Features/LinuxBoot/LinuxBinaries/initrd.cpio.xz


BIN
Platform/Intel/PurleyOpenBoardPkg/Features/LinuxBoot/LinuxBinaries/linux.efi


+ 412 - 0
Platform/Intel/PurleyOpenBoardPkg/Features/LinuxBoot/LinuxBoot.c

@@ -0,0 +1,412 @@
+/** @file
+
+Copyright (c) 2021, American Megatrends International LLC. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+
+#include <PiDxe.h>
+#include <Uefi.h>
+#include <Library/BaseLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/DebugLib.h>
+#include <Library/UefiRuntimeServicesTableLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Guid/DxeServices.h>
+#include <Library/DxeServicesTableLib.h>
+#include <Library/UefiLib.h>
+#include <Protocol/FirmwareVolume2.h>
+#include <Protocol/LoadedImage.h>
+#include <Guid/MemoryTypeInformation.h>
+#include <Pi/PiDxeCis.h>
+#include <Pi/PiHob.h>
+#include <Library/PcdLib.h>
+#include <Library/DxeServicesLib.h>
+#include "LinuxBoot.h"
+
+//16b60e5d-f1c5-42f0-9b34-08C81C430473
+#define LINUX_BOOT_INITRD_GUID \
+  { \
+    0x16b60e5d, 0xf1c5, 0x42f0, {0x9b, 0x34, 0x08, 0xc8, 0x1c, 0x43, 0x04, 0x73} \
+  }
+
+#define LINUX_BOOT_KERNEL_GUID \
+  { \
+    0x81339b04, 0xfa8c, 0x4be0, {0x9c, 0xa7, 0x91, 0x6f, 0xc5, 0x31, 0x9e, 0xb5} \
+  }
+
+
+EFI_STATUS
+EFIAPI
+LoadLinuxCheckKernelSetup (
+  IN VOID        *KernelSetup,
+  IN UINTN       KernelSetupSize
+  );
+
+VOID*
+EFIAPI
+LoadLinuxAllocateKernelSetupPages (
+  IN UINTN                  Pages
+  );
+
+EFI_STATUS
+EFIAPI
+LoadLinuxInitializeKernelSetup (
+  IN VOID        *KernelSetup
+  );
+
+VOID*
+EFIAPI
+LoadLinuxAllocateKernelPages (
+  IN VOID                   *KernelSetup,
+  IN UINTN                  Pages
+  );
+
+EFI_STATUS
+EFIAPI
+LoadLinuxSetCommandLine (
+  IN OUT VOID    *KernelSetup,
+  IN CHAR8       *CommandLine
+  );
+
+EFI_STATUS
+EFIAPI
+LoadLinux (
+  IN VOID      *Kernel,
+  IN OUT VOID  *KernelSetup
+  );
+
+VOID*
+EFIAPI
+LoadLinuxAllocateInitrdPages (
+  IN VOID                   *KernelSetup,
+  IN UINTN                  Pages
+  );
+
+EFI_GUID gLinuxBootInitrdFileGuid = LINUX_BOOT_INITRD_GUID;
+
+EFI_GUID gLinuxBootKernelFileGuid = LINUX_BOOT_KERNEL_GUID;
+
+//---------------------------------------------------------------------------
+
+/**
+  Dump some hexadecimal data to the screen.
+
+  @note Function taken from ShellPkg/Library/UefiShellCommandLib/UefiShellCommandLib.c in EDKII
+
+  @param[in] Indent     How many spaces to indent the output.
+  @param[in] Offset     The offset of the printing.
+  @param[in] DataSize   The size in bytes of UserData.
+  @param[in] UserData   The data to print out.
+**/
+static
+VOID
+DumpHex (
+  IN UINTN        Indent,
+  IN UINTN        Offset,
+  IN UINTN        DataSize,
+  IN VOID         *UserData
+  )
+{
+  UINT8 *Data;
+  CHAR8 Val[50];
+  CHAR8 Str[20];
+  UINT8 TempByte;
+  UINTN Size;
+  UINTN Index;
+  CHAR8 Hex[] = {
+    '0', '1', '2', '3', '4', '5', '6', '7',
+    '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
+  };
+
+  DEBUG((DEBUG_INFO, "%*a          00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F\n", Indent, ""));
+  DEBUG((DEBUG_INFO, "%*a          ------------------------------------------------\n", Indent, ""));
+
+  Data = UserData;
+  while (DataSize != 0) {
+    Size = 16;
+    if (Size > DataSize) {
+      Size = DataSize;
+    }
+
+    for (Index = 0; Index < Size; Index += 1) {
+      TempByte            = Data[Index];
+      Val[Index * 3 + 0]  = Hex[TempByte >> 4];
+      Val[Index * 3 + 1]  = Hex[TempByte & 0xF];
+      Val[Index * 3 + 2]  = (CHAR8) ((Index == 7) ? '-' : ' ');
+      Str[Index]          = (CHAR8) ((TempByte < ' ' || TempByte > 'z') ? '.' : TempByte);
+    }
+
+    Val[Index * 3]  = 0;
+    Str[Index]      = 0;
+    DEBUG((DEBUG_INFO, "%*a%08X: %-48a  %a\n", Indent, "", Offset, Val, Str));
+
+    Data += Size;
+    Offset += Size;
+    DataSize -= Size;
+  }
+}
+
+
+/**
+ *  This function completes a minimal amount of the necessary BDS functions to prepare
+ *  for booting the kernel.
+ *
+ *  @param  None
+ *
+ *  @retval EFI_SUCCESS         Successfully completed remaining tasks
+ *  @return EFI_ERROR           Could not complete BDS tasks
+ */
+EFI_STATUS
+CompleteBdsTasks (
+    VOID
+)
+{
+
+    return EFI_SUCCESS;
+}
+
+/**
+ *  This function will load and launch the Linux kernel from a BIOS FV.
+ *
+ *  @note   This function is not intended to return. Any exiting from this function indicates
+ *          a problem loading or launching the kernel.
+ *
+ *  @param  None
+ *
+ *  @return EFI_ERROR           Any error code
+ */
+EFI_STATUS
+LoadAndLaunchKernel (
+    VOID
+)
+{
+    EFI_LOADED_IMAGE_PROTOCOL   *LoadedImage = NULL;
+    EFI_STATUS                  Status;
+    EFI_HANDLE                  KernelHandle = NULL;
+    VOID                        *KernelBuffer = NULL;
+    VOID                        *KernelFfsBuffer = NULL;
+    UINTN                       KernelFfsSize = 0;
+    VOID                        *InitrdData = NULL;
+    VOID                        *InitrdBuffer = NULL;
+    UINTN                       InitrdSize = 0;
+    struct BootParams          *BootParams = NULL;
+    struct BootParams          *HandoverParams = NULL;
+    UINT32                      StartOffset = 0;
+    UINT32                      KernelLength = 0;
+    UINT8                       *Temp;
+    UINT8                       CmdLine[] = " ";
+
+    DEBUG((DEBUG_INFO, "LoadAndLaunchKernel Entry\n"));
+
+    ///
+    /// Kernel load and preparation
+    ///
+    DEBUG((DEBUG_INFO, "Preparing the kernel...\n"));
+
+    // Retrieve the kernel from the firmware volume
+    Status = GetSectionFromAnyFv(
+        &gLinuxBootKernelFileGuid,
+        EFI_SECTION_PE32,
+        0,
+        &KernelFfsBuffer,
+        &KernelFfsSize
+    );
+
+    DEBUG((DEBUG_INFO, "Status %r\n",Status));
+    DEBUG((DEBUG_INFO, "KernelFfsBuffer %x\n",KernelFfsBuffer));
+    DEBUG((DEBUG_INFO, "KernelFfsSize %x\n",KernelFfsSize));
+
+    if (EFI_ERROR(Status)) {
+        DEBUG((DEBUG_ERROR, "Could not retrieve kernel; %r.\n", Status));
+        goto FatalError;
+    }
+
+    DEBUG((DEBUG_INFO, "Loaded kernel to buffer at 0x%p with size 0x%X.\n", KernelFfsBuffer, KernelFfsSize));
+    DEBUG((DEBUG_INFO, "Printing first 0x%X bytes:\n", MIN(KernelFfsSize, 0x100)));
+
+    DumpHex(2, 0, MIN(0x100, KernelFfsSize), KernelFfsBuffer);
+
+    // Create a LoadImage protocol for the kernel
+    Status = gBS->LoadImage(TRUE, gImageHandle, NULL, KernelFfsBuffer, KernelFfsSize, &KernelHandle);
+    if (EFI_ERROR(Status)) {
+        DEBUG((DEBUG_ERROR, "Could not create LoadImage for kernel %r\n", Status));
+        goto FatalError;
+    }
+
+    // Get the new LoadedImage protocol to retrieve information about the kernel
+    Status = gBS->HandleProtocol(KernelHandle, &gEfiLoadedImageProtocolGuid, (VOID **) &LoadedImage);
+    if (EFI_ERROR(Status)) {
+        DEBUG((DEBUG_ERROR, "Could not get kernel LoadedImage protocol; %r\n", Status));
+        goto FatalError;
+    }
+
+    DEBUG((DEBUG_INFO, "Kernel LoadedImage information:\n"));
+    DEBUG((DEBUG_INFO, "  ImageBase = 0x%p\n", LoadedImage->ImageBase));
+    DEBUG((DEBUG_INFO, "  ImageSize = 0x%p\n", LoadedImage->ImageSize));
+
+    // Verify the kernel boot parameters from the LoadedImage and allocate an initalization buffer once verified
+    BootParams = (struct BootParams*) LoadedImage->ImageBase;
+
+    Status = LoadLinuxCheckKernelSetup((VOID *) BootParams, sizeof(struct BootParams));
+    if (EFI_ERROR (Status)) {
+        DEBUG((DEBUG_ERROR, "LoadLinuxCheckKernelSetup failed; %r.\n", Status));
+        goto FatalError;
+    }
+
+    HandoverParams = LoadLinuxAllocateKernelSetupPages(EFI_SIZE_TO_PAGES(KERNEL_SETUP_SIZE));
+    if (HandoverParams == NULL) {
+        DEBUG((DEBUG_ERROR, "Could not allocate memory for kernel handover parameters.\n"));
+        goto FatalError;
+    }
+    DEBUG((DEBUG_INFO, "Handover parameters allocated at 0x%p\n", HandoverParams));
+
+    gBS->CopyMem(&HandoverParams->Hdr, &BootParams->Hdr, sizeof(struct SetupHeader));
+
+    Status = LoadLinuxInitializeKernelSetup(HandoverParams);
+    if (EFI_ERROR (Status)) {
+        DEBUG((DEBUG_ERROR, "Unable to initialize the handover parameters; %r.\n", Status));
+        goto FatalError;
+    }
+
+    // Allocate space for the kernel and copy it into the new buffer
+    KernelBuffer = LoadLinuxAllocateKernelPages(HandoverParams, EFI_SIZE_TO_PAGES(HandoverParams->Hdr.InitSize));
+    if (KernelBuffer == NULL) {
+        DEBUG((DEBUG_ERROR, "Unable to allocate memory for kernel.\n"));
+        goto FatalError;
+    }
+
+    StartOffset = (HandoverParams->Hdr.SetupSecs + 1) * 512;
+    KernelLength = (UINT32) (KernelFfsSize - StartOffset);
+    Temp = (UINT8 *) LoadedImage->ImageBase;
+
+    DEBUG((DEBUG_INFO, "Kernel starts at offset 0x%X with length 0x%X\n", StartOffset, KernelLength));
+
+    gBS->CopyMem(KernelBuffer, (Temp + StartOffset), KernelLength);
+    DEBUG((DEBUG_INFO, "First 0x%X bytes of new kernel buffer contents:\n", MIN(0x100, KernelLength)));
+
+    DumpHex(2, 0, MIN(0x100, KernelLength), KernelBuffer);
+
+    // Prepare the command line
+    Status = LoadLinuxSetCommandLine(HandoverParams, (UINT8 *) &CmdLine);
+    if (EFI_ERROR (Status)) {
+        DEBUG((EFI_D_INFO, "Unable to set linux command line; %r.\n", Status));
+        goto FatalError;
+    }
+
+    HandoverParams->Hdr.Code32Start = (UINT32)(UINTN) KernelBuffer;
+    HandoverParams->Hdr.LoaderId = 0x21;
+
+    DEBUG((DEBUG_INFO, "Kernel loaded.\n"));
+
+    //
+    // Initrd load and preparation
+    //
+    DEBUG((DEBUG_INFO, "Preparing the initrd...\n"));
+
+    // Retrieve the initrd from the firmware volume
+    Status = GetSectionFromAnyFv(
+        &gLinuxBootInitrdFileGuid,
+        EFI_SECTION_RAW,
+        0,
+        &InitrdBuffer,
+        &InitrdSize
+    );
+
+    if (EFI_ERROR(Status)) {
+        DEBUG((DEBUG_ERROR, "Could not retrieve initrd; %r.\n", Status));
+        goto FatalError;
+    }
+
+    DEBUG((DEBUG_INFO, "Loaded initrd to buffer at 0x%p with size 0x%X.\n", InitrdBuffer, InitrdSize));
+    DEBUG((DEBUG_INFO, "Printing first 0x%X bytes:\n", MIN(0x100, InitrdSize)));
+    DumpHex(2, 0, MIN(0x100, InitrdSize), InitrdBuffer);
+
+    // Allocate the initrd for the kernel and copy it in
+    InitrdData = LoadLinuxAllocateInitrdPages(HandoverParams, EFI_SIZE_TO_PAGES(InitrdSize));
+    if (InitrdData == NULL) {
+        DEBUG((DEBUG_ERROR, "Unable to allocate memory for initrd.\n"));
+        goto FatalError;
+    }
+
+    gBS->CopyMem(InitrdData, InitrdBuffer, InitrdSize);
+
+    HandoverParams->Hdr.RamDiskStart = (UINT32)(UINTN) InitrdData;
+    HandoverParams->Hdr.RamDiskLen = (UINT32) InitrdSize;
+
+    DEBUG((DEBUG_INFO, "Initrd loaded.\n"));
+    DEBUG((DEBUG_INFO, "Printing first 0x%X bytes of initrd buffer:\n", MIN(0x100, InitrdSize)));
+    DumpHex(2, 0, MIN(0x100, InitrdSize), InitrdData);
+
+    // General cleanup before launching the kernel
+    gBS->FreePool(InitrdBuffer);
+    InitrdBuffer = NULL;
+
+    gBS->UnloadImage(KernelHandle);
+    gBS->FreePool(KernelFfsBuffer);
+    KernelFfsBuffer = NULL;
+
+    DEBUG((DEBUG_ERROR, "Launching the kernel\n"));
+
+
+    //
+    // Signal the EFI_EVENT_GROUP_READY_TO_BOOT event.
+    //
+    EfiSignalEventReadyToBoot();
+
+
+    // Launch the kernel
+    Status = LoadLinux(KernelBuffer, HandoverParams);
+
+    ///
+    /// LoadLinux should never return if the kernel boots. Anything past here is an error scenario
+    ///
+    DEBUG((DEBUG_ERROR, "ERROR: LoadLinux has returned with status; %r.\n", Status));
+
+FatalError:
+    // Free everything
+    if (InitrdData != NULL) gBS->FreePages((EFI_PHYSICAL_ADDRESS) InitrdData, EFI_SIZE_TO_PAGES(InitrdSize));
+    if (KernelBuffer != NULL) gBS->FreePages((EFI_PHYSICAL_ADDRESS) KernelBuffer, EFI_SIZE_TO_PAGES(HandoverParams->Hdr.InitSize));
+    if (HandoverParams != NULL) gBS->FreePages((EFI_PHYSICAL_ADDRESS) HandoverParams, EFI_SIZE_TO_PAGES(KERNEL_SETUP_SIZE));
+    if (InitrdBuffer != NULL) gBS->FreePool(InitrdBuffer);
+    if (KernelHandle != NULL) gBS->UnloadImage(KernelHandle);
+    if (KernelFfsBuffer != NULL) gBS->FreePool(KernelFfsBuffer);
+
+    return EFI_NOT_FOUND;
+}
+
+/**
+ *  This is the main function for this feature. This will handle finding and launching
+ *  the Linux kernel.
+ *
+ *  @note   In general, this function will never return to BDS. The LINUXBOOT_ALLOW_RETURN_TO_BDS
+ *          token will allow you to return to BDS if the kernel fails to launch for some reason.
+ *
+ *  @param  None
+ *
+ *  @retval None
+ */
+
+EFI_STATUS
+LinuxBootStart (
+  VOID
+  )
+{
+    EFI_STATUS  Status = EFI_SUCCESS;
+
+    // Finish BDS and then try to launch the kernel
+    //Status = CompleteBdsTasks();
+
+    if (!EFI_ERROR(Status)) {
+        LoadAndLaunchKernel();
+    }
+
+    DEBUG((DEBUG_ERROR, "-----------------------------------\n"));
+    DEBUG((DEBUG_ERROR, "  ERROR: Kernel failed to launch.\n"));
+    DEBUG((DEBUG_ERROR, "-----------------------------------\n"));
+    return Status;
+}
+
+//---------------------------------------------------------------------------

+ 185 - 0
Platform/Intel/PurleyOpenBoardPkg/Features/LinuxBoot/LinuxBoot.h

@@ -0,0 +1,185 @@
+/** @file
+Copyright (c) 2021, American Megatrends International LLC. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#ifndef __LINUX_BOOT_PRIVATE__H__
+#define __LINUX_BOOT_PRIVATE__H__
+#ifdef __cplusplus
+extern "C" {
+#endif  //  #ifdef __cplusplus
+
+//---------------------------------------------------------------------------
+
+//#include <Token.h>
+
+#define BOOTSIG			0x1FE
+#define SETUP_HDR		0x53726448	/* 0x53726448 == "HdrS" */
+
+#define E820_RAM		1
+#define E820_RESERVED		2
+#define E820_ACPI		3
+#define E820_NVS		4
+#define E820_UNUSABLE		5
+
+#pragma pack(1)
+
+struct SetupHeader {
+  UINT8  SetupSecs;   // Sectors for setup code
+  UINT16 Rootflags;
+  UINT32 SysSize;
+  UINT16 RamSize;
+  UINT16 VideoMode;
+  UINT16 RootDev;
+  UINT16 Signature;   // Boot signature
+  UINT16 Jump;
+  UINT32 Header;
+  UINT16 Version;
+  UINT16 SuSwitch;
+  UINT16 SetupSeg;
+  UINT16 StartSys;
+  UINT16 KernelVer;
+  UINT8  LoaderId;
+  UINT8  LoadFlags;
+  UINT16 MoveSize;
+  UINT32 Code32Start;    // Start of code loaded high
+  UINT32 RamDiskStart;   // Start of initial ramdisk
+  UINT32 RamDiskLen;     // Length of initial ramdisk
+  UINT32 BootSectkludge;
+  UINT16 HeapEnd;
+  UINT8  ExtLoaderVer;  // Extended boot loader version
+  UINT8  ExtLoaderType; // Extended boot loader ID
+  UINT32 CmdLinePtr;   // 32-bit pointer to the kernel command line
+  UINT32 RamDiskMax;    // Highest legal initrd address
+  UINT32 KernelAlignment; // Physical addr alignment required for kernel
+  UINT8  RelocatableKernel; // Whether kernel is relocatable or not
+  UINT8  MinAlignment;
+  UINT16 XloadFlags;
+  UINT32 CmdlineSize;
+  UINT32 HardwareSubarch;
+  UINT64 HardwareSubarchData;
+  UINT32 PayloadOffset;
+  UINT32 PayloadLength;
+  UINT64 SetupData;
+  UINT64 PrefAddress;
+  UINT32 InitSize;
+  UINT32 HandoverOffset;
+};
+
+struct EfiInfo {
+  UINT32 EfiLoaderSignature;
+  UINT32 EfiSystab;
+  UINT32 EfiMemdescSize;
+  UINT32 EfiMemdescVersion;
+  UINT32 EfiMemMap;
+  UINT32 EfiMemMapSize;
+  UINT32 EfiSystabHi;
+  UINT32 EfiMemMapHi;
+};
+
+struct E820Entry {
+  UINT64 Addr;        // start of memory segment
+  UINT64 Size;        // size of memory segment
+  UINT32 Type;        // type of memory segment
+};
+
+struct ScreenInfo {
+  UINT8  OrigX;           // 0x00
+  UINT8  OrigY;           // 0x01
+  UINT16 ExtMemK;        // 0x02
+  UINT16 OrigVideoPage;  // 0x04
+  UINT8  OrigVideoMode;  // 0x06
+  UINT8  OrigVideoCols;  // 0x07
+  UINT8  Flags;            // 0x08
+  UINT8  Unused2;          // 0x09
+  UINT16 OrigVideoEgaBx;// 0x0a
+  UINT16 Unused3;          // 0x0c
+  UINT8  OrigVideoLines; // 0x0e
+  UINT8  OrigVideoIsVGA; // 0x0f
+  UINT16 OrigVideoPoints;// 0x10
+
+  // VESA graphic mode -- linear frame buffer
+  UINT16 LfbWidth;        // 0x12
+  UINT16 LfbHeight;       // 0x14
+  UINT16 LfbDepth;        // 0x16
+  UINT32 LfbBase;         // 0x18
+  UINT32 LfbSize;         // 0x1c
+  UINT16 ClMagic, ClOffset; // 0x20
+  UINT16 LfbLineLength;       // 0x24
+  UINT8  RedSize;         // 0x26
+  UINT8  RedPos;          // 0x27
+  UINT8  GreenSize;       // 0x28
+  UINT8  GreenPos;        // 0x29
+  UINT8  BlueSize;        // 0x2a
+  UINT8  BluePos;         // 0x2b
+  UINT8  RsvdSize;        // 0x2c
+  UINT8  RsvdPos;         // 0x2d
+  UINT16 VesaPmSeg;       // 0x2e
+  UINT16 VesaPmOff;       // 0x30
+  UINT16 Pages;            // 0x32
+  UINT16 VesaAttributes;  // 0x34
+  UINT32 Capabilities;     // 0x36
+  UINT8  Reserved[6];     // 0x3a
+};
+
+struct BootParams {
+  struct ScreenInfo ScreenInfo;
+  UINT8  ApmBiosInfo[0x14];
+  UINT8  Pad2[4];
+  UINT64 TbootAddr;
+  UINT8  IstInfo[0x10];
+  UINT8  Pad3[16];
+  UINT8  Hd0Info[16];
+  UINT8  Hd1Info[16];
+  UINT8  SysDescTable[0x10];
+  UINT8  OlpcOfwHeader[0x10];
+  UINT8  Pad4[128];
+  UINT8  EdidInfo[0x80];
+  struct EfiInfo EfiInfo;
+  UINT32 AltMemK;
+  UINT32 Scratch;
+  UINT8 E820Entries;
+  UINT8 EddBufEntries;
+  UINT8 EddMbrSigBufEntries;
+  UINT8 Pad6[6];
+  struct SetupHeader Hdr;
+  UINT8 Pad7[0x290-0x1f1-sizeof(struct SetupHeader)];
+  UINT32 EddMbrSigBuffer[16];
+  struct E820Entry E820Map[128];
+  UINT8  Pad8[48];
+  UINT8  EddBuf[0x1ec];
+  UINT8  Pad9[276];
+};
+#pragma pack ()
+
+//---------------------------------------------------------------------------
+
+#ifndef MIN
+#define MIN(x,y)                ((x) < (y) ? (x) : (y))
+#endif  //  #ifndef MIN
+
+#define KERNEL_SETUP_SIZE       16384
+
+//---------------------------------------------------------------------------
+
+///
+/// Function prototypes from Bds module
+///
+VOID ConnectEverything();
+VOID RecoverTheMemoryAbove4Gb();
+VOID SignalAllDriversConnectedEvent();
+VOID SignalProtocolEvent(IN EFI_GUID *ProtocolGuid);
+
+#if LINUXBOOT_SIGNAL_EXITPMAUTH == 1
+VOID SignalExitPmAuthProtocolEvent(VOID);
+#endif  //  #if LINUXBOOT_SIGNAL_EXITPMAUTH == 1
+
+typedef VOID (BDS_CONTROL_FLOW_FUNCTION)();
+
+//---------------------------------------------------------------------------
+
+/****** DO NOT WRITE BELOW THIS LINE *******/
+#ifdef __cplusplus
+}
+#endif  //  #ifdef __cplusplus
+#endif  //  #ifndef __LINUX_BOOT_PRIVATE__H__

+ 40 - 0
Platform/Intel/PurleyOpenBoardPkg/Features/LinuxBoot/LinuxBoot.inf

@@ -0,0 +1,40 @@
+## @file
+#
+# Copyright (c) 2021, American Megatrends International LLC.<BR>
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+    INF_VERSION                 =   0x00010005
+    VERSION_STRING              =   1.0
+    BASE_NAME                   =   LinuxBoot
+    FILE_GUID                   =   74a41ddc-fac5-4787-afad-d81ee30a8b63    #   {0x74a41ddc, 0xfac5, 0x4787, {0xaf, 0xad, 0xd8, 0x1e, 0xe3, 0x0a, 0x8b, 0x63}}
+    MODULE_TYPE                 =   DXE_DRIVER
+    LIBRARY_CLASS               =   LinuxBootLib|DXE_DRIVER
+[Sources]
+   LinuxBoot.c
+   LinuxBoot.h
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  MinPlatformPkg/MinPlatformPkg.dec
+
+[LibraryClasses]
+  UefiDriverEntryPoint
+  DxeServicesLib
+  BaseMemoryLib
+  DebugLib
+  UefiRuntimeServicesTableLib
+  UefiBootServicesTableLib
+  UefiLib
+  LoadLinuxLib
+  
+[Guids]
+  
+[Protocols]
+  gEfiLoadedImageProtocolGuid
+
+[Pcd]

+ 36 - 0
Platform/Intel/PurleyOpenBoardPkg/Features/LinuxBoot/LinuxBootNull.c

@@ -0,0 +1,36 @@
+/** @file
+
+Copyright (c) 2021, American Megatrends International LLC. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+
+#include <PiDxe.h>
+#include <Uefi.h>
+#include <Library/BaseLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+
+
+/**
+ *  This is the main function for this feature. This will handle finding and launching
+ *  the Linux kernel.
+ *
+ *  @note   In general, this function will never return to BDS. The LINUXBOOT_ALLOW_RETURN_TO_BDS
+ *          token will allow you to return to BDS if the kernel fails to launch for some reason.
+ *
+ *  @param  None
+ *
+ *  @retval None
+ */
+
+EFI_STATUS
+LinuxBootStart (
+  VOID
+  )
+{
+
+    return EFI_SUCCESS;
+}
+
+

+ 25 - 0
Platform/Intel/PurleyOpenBoardPkg/Features/LinuxBoot/LinuxBootNull.inf

@@ -0,0 +1,25 @@
+## @file
+#
+# Copyright (c) 2021, American Megatrends International LLC.<BR>
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+    INF_VERSION                 =   0x00010005
+    VERSION_STRING              =   1.0
+    BASE_NAME                   =   LinuxBoot
+    FILE_GUID                   =   0551B6D3-0594-4B02-AF42-5A9C7515CEC8
+    MODULE_TYPE                 =   DXE_DRIVER
+    LIBRARY_CLASS               =   LinuxBootLib|DXE_DRIVER
+[Sources]
+   LinuxBootNull.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+
+[LibraryClasses]
+  UefiDriverEntryPoint
+  DxeServicesLib

+ 2 - 0
Platform/Intel/PurleyOpenBoardPkg/OpenBoardPkg.dec

@@ -49,6 +49,8 @@
 
   gPlatformTokenSpaceGuid.PcdUpdateConsoleInBds|TRUE|BOOLEAN|0x30000035
 
+  gPlatformTokenSpaceGuid.PcdLinuxBootEnable|FALSE|BOOLEAN|0x30000036
+  
 [PcdsDynamicEx]
   gPlatformTokenSpaceGuid.PcdDfxAdvDebugJumper|FALSE|BOOLEAN|0x6000001D
 

+ 9 - 0
Platform/Intel/PurleyOpenBoardPkg/Override/Platform/Intel/MinPlatformPkg/Bds/Library/DxePlatformBootManagerLib/BdsPlatform.c

@@ -2,6 +2,7 @@
   This file include all platform action which can be customized by IBV/OEM.
 
 Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2021, American Megatrends International LLC.<BR>
 SPDX-License-Identifier: BSD-2-Clause-Patent
 
 **/
@@ -31,6 +32,12 @@ BOOLEAN                      gPPRequireUIConfirm;
 
 extern UINTN                                      mBootMenuOptionNumber;
 
+EFI_STATUS
+LinuxBootStart (
+  VOID
+  );
+
+
 GLOBAL_REMOVE_IF_UNREFERENCED USB_CLASS_FORMAT_DEVICE_PATH gUsbClassKeyboardDevicePath = {
   {
     {
@@ -1268,6 +1275,8 @@ PlatformBootManagerAfterConsole (
   LocalBootMode = gBootMode;
   DEBUG ((DEBUG_INFO, "Current local bootmode - %x\n", LocalBootMode));
 
+  LinuxBootStart();
+  
   //
   // Go the different platform policy with different boot mode
   // Notes: this part code can be change with the table policy

+ 2 - 0
Platform/Intel/PurleyOpenBoardPkg/Override/Platform/Intel/MinPlatformPkg/Bds/Library/DxePlatformBootManagerLib/DxePlatformBootManagerLib.inf

@@ -2,6 +2,7 @@
 # Component name for module DxePlatformBootManagerLib
 #
 # Copyright (c) 2017 - 2021, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2021, American Megatrends International LLC.<BR>
 #
 # SPDX-License-Identifier: BSD-2-Clause-Patent
 #
@@ -40,6 +41,7 @@
   PerformanceLib
   TimerLib
   Tcg2PhysicalPresenceLib
+  LinuxBootLib
 
 [Packages]
   MdePkg/MdePkg.dec

+ 42 - 0
Platform/Intel/Readme.md

@@ -90,6 +90,11 @@ A UEFI firmware implementation using MinPlatformPkg is constructed using the fol
 ----------------------------------------|--------------------------------------------|------------------------------|--------------------|
 | Mt. Olympus                           | Purley                                     | PurleyOpenBoardPkg           | BoardMtOlympus     |
 
+| Machine Name                          | Supported Chipsets                         | BoardPkg                     | Board Name         |
+----------------------------------------|--------------------------------------------|------------------------------|--------------------|
+| TiogaPass                             | Purley                                     | PurleyOpenBoardPkg           | BoardTiogaPass     |
+
+
 #### Simics
 
 | Machine Name                          | Supported Chipsets                         | BoardPkg                     | Board Name         |
@@ -253,6 +258,12 @@ return back to the minimum platform caller.
           |       |        |               |                     build settings, environment variables.
           |       |        |               |---build_board.py: Optional board-specific pre-build,
           |       |        |                                   build, post-build and clean functions.
+          |       |        |------PurleyOpenBoardPkg
+          |       |        |       |------BoardTiogaPass
+          |       |        |               |---build_config.cfg: BoardTiogaPass specific
+          |       |        |               |                     build settings, environment variables.
+          |       |        |               |---build_board.py: Optional board-specific pre-build,
+          |       |        |                                   build, post-build and clean functions.          
           |       |        |
           |       |        |------SimicsOpenBoardPkg
           |       |        |       |------BoardX58Ich10
@@ -303,6 +314,18 @@ For PurleyOpenBoardPkg
    "bld cache-consume" Consume a cache of binary files from the specified directory, BINARY_CACHE_PATH is empty,
    used "BinCache" as default path.
 
+For PurleyOpenBoardPkg (TiogaPass)
+1. Open command window, go to the workspace directory, e.g. c:\Edk2Workspace.
+2. Type "cd edk2-platforms\Platform\Intel\PurleyOpenBoardPkg\BoardTiogaPass".
+3. Type "GitEdk2MinBoardTiogaPass.bat" to setup GIT environment.
+4. Type "bld" to build Purley BoardTiogaPass board UEFI firmware image, "bld release" for release build, "bld clean" to
+   remove intermediate files."bld cache-produce" Generate a cache of binary files in the specified directory,
+   "bld cache-consume" Consume a cache of binary files from the specified directory, BINARY_CACHE_PATH is empty,
+   used "BinCache" as default path.  
+5. Final BIOS image will be Build\PurleyOpenBoardPkg\BoardTiagoPass\DEBUG_VS2015x86\FV\PLATFORM.fd or    
+   Build\PurleyOpenBoardPkg\BoardTiagoPass\RELEASE_VS2015x86\FV\PLATFORM.fd, depending on bld batch script input.
+6. This BIOS image needs to be merged with SPS FW    
+
 ### **Known limitations**
 
 **KabylakeOpenBoardPkg**
@@ -318,6 +341,25 @@ For PurleyOpenBoardPkg
 2. This firmware project does not build with the GCC compiler.
 3. The validated version of iASL compiler that can build MinPurley is 20180629. Older versions may generate ACPI build errors.
 
+**PurleyOpenBoardPkg Tioga Pass **
+1. This firmware project has only been tested on the Tioga Pass hardware.
+2. This firmware project build has only been tested using the Microsoft Visual Studio 2015 build tools.
+3. This firmware project does not build with the GCC compiler.
+4. The validated version of iASL compiler that can build MinPurley is 20180629. Older versions may generate ACPI build errors.
+5. Installed and booted to UEFI Windows 2016 on M.2 NVME slot
+6. Installed and booted to UEFI Windows 2019 on M.2 NVME slot and with SATA HDD.
+7. Installed and booted to UEFI RHEL 7.3 on SATA HDD
+8. Installed and booted to Ubuntu 18.04 on M.2 NVME slot.
+9. Verified Mellanox card detection during POST and OS
+10. LINUX Boot Support (PcdLinuxBootEnable needs to be enabled)
+
+1.	Follow directions on http://osresearch.net/Building/ to compile the heads kernel and initrd for qemu-system_x86_64 
+2.	Copy the following built files 
+(1) initrd.cpio.xz  to LinuxBootPkg/LinuxBinaries/initrd.cpio.xz 
+(2) bzimage to LinuxBootPkg/LinuxBinaries/linux.efi
+
+
+
 **SimicsOpenBoardPkg**
 1. This firmware project has only been tested booting to Microsoft Windows 10 x64 and Ubuntu 17.10 with AHCI mode.