Sorry, pressed send too soon...
On 14 July 2015 at 16:38, Ryan Harkin <ryan.har...@linaro.org> wrote:
>
>
> On 14 July 2015 at 11:12, Olivier Martin <olivier.mar...@arm.com> wrote:
>
>> When PcdBdsLinuxSupport is enabled, users can create boot
>> entries for the legacy EFI Linux loader.
>>
>> The ARM BDS detects if the image is a EFI image if not
>> then it assumes it is a legacy Linux kernel (a kernel
>> without EFI Stub).
>> If the Boot Manager did not manage to load the binary
>> (it could happen when the binary is on the network or
>> not present on the media yet).
>>
>
> Sorry to be a pain, but I'm not sure what this last sentence means. It
> seems incomplete.
>
> I suppose you're trying to say that the BDS will assume the image is a
> legacy Linux kernel image "If the Boot Manager did not manage to load the
> binary..."?
>
You used network as an example. I believe TFTP boot may work as expected
in this scenario if the binary is found on the network: if the binary is
found and it had an EFI header, then BDS will force it to be an EFI
application. Then, there is no way for the EFI header in the kernel to
fetch it's initrd or device tree, because the EFI header doesn't understand
TFTP. So "Image dtb=fdt.dtb initrd=ramdisk.img" on a kernel fetched via
TFTP will not be able to boot.
In my opinion, the safest course of action is to skip detection of the EFI
image and just ask "Is an EFI application?" like in the old days. It's
also much faster because you don't have to wait for BDS to load the image
and verify it.
>
>
>>
>> Contributed-under: TianoCore Contribution Agreement 1.0
>> Signed-off-by: Olivier Martin <olivier.mar...@arm.com>
>> Reviewed-by: Ronald Cron <ronald.c...@arm.com>
>> ---
>> ArmPlatformPkg/ArmPlatformPkg.dec | 3 +
>> ArmPlatformPkg/Bds/Bds.inf | 4 +
>> ArmPlatformPkg/Bds/BdsHelper.c | 9 ---
>> ArmPlatformPkg/Bds/BdsInternal.h | 26 ++++--
>> ArmPlatformPkg/Bds/BootLinux.c | 124 +++++++++++++++++++++++++++++
>> ArmPlatformPkg/Bds/BootMenu.c | 161
>> +++++++++++++++++++++++++++++---------
>> 6 files changed, 274 insertions(+), 53 deletions(-)
>> create mode 100644 ArmPlatformPkg/Bds/BootLinux.c
>>
>> diff --git a/ArmPlatformPkg/ArmPlatformPkg.dec
>> b/ArmPlatformPkg/ArmPlatformPkg.dec
>> index be0919b..45aeaee 100644
>> --- a/ArmPlatformPkg/ArmPlatformPkg.dec
>> +++ b/ArmPlatformPkg/ArmPlatformPkg.dec
>> @@ -61,6 +61,9 @@
>> # we assume the OS will handle the FrameBuffer from the UEFI GOP
>> information.
>>
>>
>> gArmPlatformTokenSpaceGuid.PcdGopDisableOnExitBootServices|FALSE|BOOLEAN|0x0000003D
>>
>> + # Enable Legacy Linux support in the BDS
>> + gArmPlatformTokenSpaceGuid.PcdBdsLinuxSupport|TRUE|BOOLEAN|0x0000002E
>> +
>> [PcdsFixedAtBuild.common]
>> gArmPlatformTokenSpaceGuid.PcdCoreCount|1|UINT32|0x00000039
>> gArmPlatformTokenSpaceGuid.PcdClusterCount|1|UINT32|0x00000038
>> diff --git a/ArmPlatformPkg/Bds/Bds.inf b/ArmPlatformPkg/Bds/Bds.inf
>> index 3b6ffc3..06e8d91 100644
>> --- a/ArmPlatformPkg/Bds/Bds.inf
>> +++ b/ArmPlatformPkg/Bds/Bds.inf
>> @@ -27,6 +27,7 @@
>> [Sources]
>> Bds.c
>> BdsHelper.c
>> + BootLinux.c
>> BootMenu.c
>> BootOption.c
>> BootOptionSupport.c
>> @@ -72,6 +73,9 @@
>> gEfiDhcp4ServiceBindingProtocolGuid
>> gEfiMtftp4ServiceBindingProtocolGuid
>>
>> +[FeaturePcd]
>> + gArmPlatformTokenSpaceGuid.PcdBdsLinuxSupport
>> +
>> [Pcd]
>> gArmPlatformTokenSpaceGuid.PcdFirmwareVendor
>> gArmPlatformTokenSpaceGuid.PcdDefaultBootDescription
>> diff --git a/ArmPlatformPkg/Bds/BdsHelper.c
>> b/ArmPlatformPkg/Bds/BdsHelper.c
>> index b3003e9..732292c 100644
>> --- a/ArmPlatformPkg/Bds/BdsHelper.c
>> +++ b/ArmPlatformPkg/Bds/BdsHelper.c
>> @@ -256,15 +256,6 @@ GetHIInputBoolean (
>> }
>> }
>>
>> -BOOLEAN
>> -HasFilePathEfiExtension (
>> - IN CHAR16* FilePath
>> - )
>> -{
>> - return (StrCmp (FilePath + (StrSize (FilePath) / sizeof (CHAR16)) - 5,
>> L".EFI") == 0) ||
>> - (StrCmp (FilePath + (StrSize (FilePath) / sizeof (CHAR16)) - 5,
>> L".efi") == 0);
>> -}
>> -
>> // Return the last non end-type Device Path Node from a Device Path
>> EFI_DEVICE_PATH*
>> GetLastDevicePathNode (
>> diff --git a/ArmPlatformPkg/Bds/BdsInternal.h
>> b/ArmPlatformPkg/Bds/BdsInternal.h
>> index fe4fd79..ddf5308 100644
>> --- a/ArmPlatformPkg/Bds/BdsInternal.h
>> +++ b/ArmPlatformPkg/Bds/BdsInternal.h
>> @@ -1,6 +1,6 @@
>> /** @file
>> *
>> -* Copyright (c) 2011-2014, ARM Limited. All rights reserved.
>> +* Copyright (c) 2011-2015, ARM Limited. All rights reserved.
>> *
>> * This program and the accompanying materials
>> * are licensed and made available under the terms and conditions of the
>> BSD License
>> @@ -79,6 +79,12 @@ typedef struct _BDS_LOAD_OPTION_SUPPORT {
>> #define LOAD_OPTION_ENTRY_FROM_LINK(a) BASE_CR(a,
>> BDS_LOAD_OPTION_ENTRY, Link)
>> #define LOAD_OPTION_FROM_LINK(a)
>> ((BDS_LOAD_OPTION_ENTRY*)BASE_CR(a, BDS_LOAD_OPTION_ENTRY,
>> Link))->BdsLoadOption
>>
>> +// GUID of the EFI Linux Loader
>> +extern CONST EFI_GUID mLinuxLoaderAppGuid;
>> +
>> +// Device path of the EFI Linux Loader in the Firmware Volume
>> +extern EFI_DEVICE_PATH* mLinuxLoaderDevicePath;
>> +
>> EFI_STATUS
>> BootDeviceListSupportedInit (
>> IN OUT LIST_ENTRY *SupportedDeviceList
>> @@ -141,11 +147,6 @@ GetHIInputBoolean (
>> OUT BOOLEAN *Value
>> );
>>
>> -BOOLEAN
>> -HasFilePathEfiExtension (
>> - IN CHAR16* FilePath
>> - );
>> -
>> EFI_DEVICE_PATH*
>> GetLastDevicePathNode (
>> IN EFI_DEVICE_PATH* DevicePath
>> @@ -260,4 +261,17 @@ EmptyCallbackFunction (
>> IN VOID *Context
>> );
>>
>> +/**
>> + * This function check if the DevicePath defines an EFI binary
>> + *
>> + * This function is used when the BDS support Linux loader to
>> + * detect if the binary is an EFI application or potentially a
>> + * Linux kernel.
>> + */
>> +EFI_STATUS
>> +IsEfiBinary (
>> + IN EFI_DEVICE_PATH* DevicePath,
>> + OUT BOOLEAN *EfiBinary
>> + );
>> +
>> #endif /* _BDSINTERNAL_H_ */
>> diff --git a/ArmPlatformPkg/Bds/BootLinux.c
>> b/ArmPlatformPkg/Bds/BootLinux.c
>> new file mode 100644
>> index 0000000..0445e89
>> --- /dev/null
>> +++ b/ArmPlatformPkg/Bds/BootLinux.c
>> @@ -0,0 +1,124 @@
>> +/** @file
>> +*
>> +* Copyright (c) 2011 - 2015, ARM Limited. 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 "BdsInternal.h"
>> +
>> +// This GUID is defined in the INGF file of
>> ArmPkg/Application/LinuxLoader
>> +CONST EFI_GUID mLinuxLoaderAppGuid = { 0x701f54f2, 0x0d70, 0x4b89, {
>> 0xbc, 0x0a, 0xd9, 0xca, 0x25, 0x37, 0x90, 0x59 }};
>> +
>> +// Device path of the EFI Linux Loader in the Firmware Volume
>> +EFI_DEVICE_PATH* mLinuxLoaderDevicePath = NULL;
>> +
>> +STATIC
>> +BOOLEAN
>> +HasFilePathEfiExtension (
>> + IN CHAR16* FilePath
>> + )
>> +{
>> + return (StrCmp (FilePath + (StrSize (FilePath) / sizeof (CHAR16)) - 5,
>> L".EFI") == 0) ||
>> + (StrCmp (FilePath + (StrSize (FilePath) / sizeof (CHAR16)) - 5,
>> L".efi") == 0);
>> +}
>> +
>> +/**
>> + * This function check if the DevicePath defines an EFI binary
>> + *
>> + * This function is used when the BDS support Linux loader to
>> + * detect if the binary is an EFI application or potentially a
>> + * Linux kernel.
>> + */
>> +EFI_STATUS
>> +IsEfiBinary (
>> + IN EFI_DEVICE_PATH* DevicePath,
>> + OUT BOOLEAN *EfiBinary
>> + )
>> +{
>> + EFI_STATUS Status;
>> + CHAR16* FileName;
>> + EFI_DEVICE_PATH* PrevDevicePathNode;
>> + EFI_DEVICE_PATH* DevicePathNode;
>> + EFI_PHYSICAL_ADDRESS Image;
>> + UINTN FileSize;
>> + EFI_IMAGE_DOS_HEADER* DosHeader;
>> + UINTN PeCoffHeaderOffset;
>> + EFI_IMAGE_NT_HEADERS32* NtHeader;
>> +
>> + ASSERT (EfiBinary != NULL);
>> +
>> + //
>> + // Check if the last node of the device path is a FilePath node
>> + //
>> + PrevDevicePathNode = NULL;
>> + DevicePathNode = DevicePath;
>> + while ((DevicePathNode != NULL) && !IsDevicePathEnd (DevicePathNode)) {
>> + PrevDevicePathNode = DevicePathNode;
>> + DevicePathNode = NextDevicePathNode (DevicePathNode);
>> + }
>> +
>> + if ((PrevDevicePathNode != NULL) &&
>> + (PrevDevicePathNode->Type == MEDIA_DEVICE_PATH) &&
>> + (PrevDevicePathNode->SubType == MEDIA_FILEPATH_DP))
>> + {
>> + FileName = ((FILEPATH_DEVICE_PATH*)PrevDevicePathNode)->PathName;
>> + } else {
>> + FileName = NULL;
>> + }
>> +
>> + if (FileName == NULL) {
>> + Print (L"Is an EFI Application? ");
>> + Status = GetHIInputBoolean (EfiBinary);
>> + if (EFI_ERROR (Status)) {
>> + return EFI_ABORTED;
>> + }
>> + } else if (HasFilePathEfiExtension (FileName)) {
>> + *EfiBinary = TRUE;
>> + } else {
>> + // Check if the file exist
>> + Status = BdsLoadImage (DevicePath, AllocateAnyPages, &Image,
>> &FileSize);
>> + if (!EFI_ERROR (Status)) {
>> +
>> + DosHeader = (EFI_IMAGE_DOS_HEADER *)(UINTN) Image;
>> + if (DosHeader->e_magic == EFI_IMAGE_DOS_SIGNATURE) {
>> + //
>> + // DOS image header is present,
>> + // so read the PE header after the DOS image header.
>> + //
>> + PeCoffHeaderOffset = DosHeader->e_lfanew;
>> + } else {
>> + PeCoffHeaderOffset = 0;
>> + }
>> +
>> + //
>> + // Check PE/COFF image.
>> + //
>> + NtHeader = (EFI_IMAGE_NT_HEADERS32 *)(UINTN) (Image +
>> PeCoffHeaderOffset);
>> + if (NtHeader->Signature != EFI_IMAGE_NT_SIGNATURE) {
>> + *EfiBinary = FALSE;
>> + } else {
>> + *EfiBinary = TRUE;
>> + }
>> +
>> + // Free memory
>> + gBS->FreePages (Image, EFI_SIZE_TO_PAGES (FileSize));
>> + } else {
>> + // If we did not manage to open it then ask for the type
>> + Print (L"Is an EFI Application? ");
>> + Status = GetHIInputBoolean (EfiBinary);
>> + if (EFI_ERROR (Status)) {
>> + return EFI_ABORTED;
>> + }
>> + }
>> + }
>> +
>> + return EFI_SUCCESS;
>> +}
>> diff --git a/ArmPlatformPkg/Bds/BootMenu.c b/ArmPlatformPkg/Bds/BootMenu.c
>> index af7f1f1..8caa3ce 100644
>> --- a/ArmPlatformPkg/Bds/BootMenu.c
>> +++ b/ArmPlatformPkg/Bds/BootMenu.c
>> @@ -269,6 +269,8 @@ BootMenuAddBootOption (
>> EFI_DEVICE_PATH_PROTOCOL *DevicePathNodes;
>> UINT8* OptionalData;
>> UINTN OptionalDataSize;
>> + BOOLEAN EfiBinary;
>> + CHAR16 *LinuxDevicePath;
>>
>> Attributes = 0;
>> SupportedBootDevice = NULL;
>> @@ -281,8 +283,12 @@ BootMenuAddBootOption (
>> }
>>
>> // Create the specific device path node
>> - Status = SupportedBootDevice->Support->CreateDevicePathNode (L"EFI
>> Application or the kernel", &DevicePathNodes);
>> - if (EFI_ERROR(Status)) {
>> + if (FeaturePcdGet (PcdBdsLinuxSupport) && mLinuxLoaderDevicePath) {
>> + Status = SupportedBootDevice->Support->CreateDevicePathNode (L"EFI
>> Application or the kernel", &DevicePathNodes);
>> + } else {
>> + Status = SupportedBootDevice->Support->CreateDevicePathNode (L"EFI
>> Application", &DevicePathNodes);
>> + }
>> + if (EFI_ERROR (Status)) {
>> Status = EFI_ABORTED;
>> goto EXIT;
>> }
>> @@ -293,8 +299,39 @@ BootMenuAddBootOption (
>> goto EXIT;
>> }
>>
>> + // Is it an EFI application?
>> + if (FeaturePcdGet (PcdBdsLinuxSupport) && mLinuxLoaderDevicePath) {
>> + Status = IsEfiBinary (DevicePath, &EfiBinary);
>> + if (EFI_ERROR (Status)) {
>> + Status = EFI_ABORTED;
>> + goto EXIT;
>> + }
>> +
>> + if (EfiBinary == FALSE) {
>> + Print (L"It is assumed the binary is a Linux kernel and the
>> embedded Linux Loader is going to be used.\n");
>> + Print (L"Supported command line formats by the embedded Linux
>> Loader:\n");
>> + Print (L"- <EFI device path of the Linux kernel> -c \"<Linux
>> kernel command line>\"\n");
>> + Print (L"- <EFI device path of the Linux kernel> -c \"<Linux
>> kernel command line>\" -f <EFI Device Path of the Linux initrd>\n");
>> + Print (L"- <EFI device path of the Linux kernel> -c \"<Linux
>> kernel command line>\" -a <Machine Type for ATAG Linux kernel>\n");
>> +
>> + // Copy the Linux path into the command line
>> + LinuxDevicePath = ConvertDevicePathToText (DevicePath, FALSE,
>> FALSE);
>> + CopyMem (CmdLine, LinuxDevicePath, MAX (sizeof (CmdLine), StrSize
>> (LinuxDevicePath)));
>> + FreePool (LinuxDevicePath);
>> +
>> + // Free the generated Device Path
>> + FreePool (DevicePath);
>> + // and use the embedded Linux Loader as the EFI application
>> + DevicePath = mLinuxLoaderDevicePath;
>> + } else {
>> + CmdLine[0] = L'\0';
>> + }
>> + } else {
>> + CmdLine[0] = L'\0';
>> + }
>> +
>> Print (L"Arguments to pass to the EFI Application: ");
>> - Status = GetHIInputStr (CmdLine, BOOT_DEVICE_OPTION_MAX);
>> + Status = EditHIInputStr (CmdLine, BOOT_DEVICE_OPTION_MAX);
>> if (EFI_ERROR (Status)) {
>> Status = EFI_ABORTED;
>> goto EXIT;
>> @@ -366,11 +403,13 @@ BootMenuUpdateBootOption (
>> CHAR16
>> BootDescription[BOOT_DEVICE_DESCRIPTION_MAX];
>> CHAR8 CmdLine[BOOT_DEVICE_OPTION_MAX];
>> CHAR16 UnicodeCmdLine[BOOT_DEVICE_OPTION_MAX];
>> + CHAR16 *LinuxDevicePath;
>> EFI_DEVICE_PATH *DevicePath;
>> UINT8* OptionalData;
>> UINTN OptionalDataSize;
>> BOOLEAN IsPrintable;
>> BOOLEAN IsUnicode;
>> + BOOLEAN EfiBinary;
>>
>> DisplayBootOptions (BootOptionsList);
>> Status = SelectBootOption (BootOptionsList, UPDATE_BOOT_ENTRY,
>> &BootOptionEntry);
>> @@ -386,46 +425,87 @@ BootMenuUpdateBootOption (
>> return EFI_UNSUPPORTED;
>> }
>>
>> - Status = DeviceSupport->UpdateDevicePathNode
>> (BootOption->FilePathList, L"EFI Application or the kernel", &DevicePath);
>> - if (EFI_ERROR(Status)) {
>> - Status = EFI_ABORTED;
>> - goto EXIT;
>> + EfiBinary = TRUE;
>> + if (FeaturePcdGet (PcdBdsLinuxSupport) && mLinuxLoaderDevicePath) {
>> + Status = DeviceSupport->UpdateDevicePathNode
>> (BootOption->FilePathList, L"EFI Application or the kernel", &DevicePath);
>> + if (EFI_ERROR (Status)) {
>> + Status = EFI_ABORTED;
>> + goto EXIT;
>> + }
>> +
>> + // Is it an EFI application?
>> + Status = IsEfiBinary (DevicePath, &EfiBinary);
>> + if (EFI_ERROR (Status)) {
>> + Status = EFI_ABORTED;
>> + goto EXIT;
>> + }
>> +
>> + if (EfiBinary == FALSE) {
>> + Print (L"It is assumed the binary is a Linux kernel and the
>> embedded Linux Loader is going to be used.\n");
>> + Print (L"Supported command line formats by the embedded Linux
>> Loader:\n");
>> + Print (L"- <EFI device path of the Linux kernel> -c \"<Linux
>> kernel command line>\"\n");
>> + Print (L"- <EFI device path of the Linux kernel> -c \"<Linux
>> kernel command line>\" -f <EFI Device Path of the Linux initrd>\n");
>> + Print (L"- <EFI device path of the Linux kernel> -c \"<Linux
>> kernel command line>\" -a <Machine Type for ATAG Linux kernel>\n");
>> +
>> + // Copy the Linux path into the command line
>> + LinuxDevicePath = ConvertDevicePathToText (DevicePath, FALSE,
>> FALSE);
>> + CopyMem (UnicodeCmdLine, LinuxDevicePath, MAX (sizeof
>> (UnicodeCmdLine), StrSize (LinuxDevicePath)));
>> + FreePool (LinuxDevicePath);
>> +
>> + // Free the generated Device Path
>> + FreePool (DevicePath);
>> + // and use the embedded Linux Loader as the EFI application
>> + DevicePath = mLinuxLoaderDevicePath;
>> +
>> + // The command line is a unicode printable string
>> + IsPrintable = TRUE;
>> + IsUnicode = TRUE;
>> + }
>> + } else {
>> + Status = DeviceSupport->UpdateDevicePathNode
>> (BootOption->FilePathList, L"EFI Application", &DevicePath);
>> + if (EFI_ERROR (Status)) {
>> + Status = EFI_ABORTED;
>> + goto EXIT;
>> + }
>> }
>>
>> Print (L"Arguments to pass to the EFI Application: ");
>>
>> - if (BootOption->OptionalDataSize > 0) {
>> - IsPrintable = IsPrintableString (BootOption->OptionalData,
>> &IsUnicode);
>> - if (IsPrintable) {
>> - //
>> - // The size in bytes of the string, final zero included, should
>> - // be equal to or at least lower than
>> "BootOption->OptionalDataSize"
>> - // and the "IsPrintableString()" has already tested that the
>> length
>> - // in number of characters is smaller than
>> BOOT_DEVICE_OPTION_MAX,
>> - // final '\0' included. We can thus copy the string for editing
>> - // using "CopyMem()". Furthermore, note that in the case of an
>> Unicode
>> - // string "StrnCpy()" and "StrCpy()" can not be used to copy the
>> - // string because the data pointed to by
>> "BootOption->OptionalData"
>> - // is not necessarily 2-byte aligned.
>> - //
>> - if (IsUnicode) {
>> - CopyMem (
>> - UnicodeCmdLine, BootOption->OptionalData,
>> - MIN (sizeof (UnicodeCmdLine),
>> - BootOption->OptionalDataSize)
>> - );
>> - } else {
>> - CopyMem (
>> - CmdLine, BootOption->OptionalData,
>> - MIN (sizeof (CmdLine),
>> - BootOption->OptionalDataSize)
>> - );
>> + // When the command line has not been initialized by the embedded
>> Linux loader earlier
>> + if (EfiBinary) {
>> + if (BootOption->OptionalDataSize > 0) {
>> + IsPrintable = IsPrintableString (BootOption->OptionalData,
>> &IsUnicode);
>> + if (IsPrintable) {
>> + //
>> + // The size in bytes of the string, final zero included, should
>> + // be equal to or at least lower than
>> "BootOption->OptionalDataSize"
>> + // and the "IsPrintableString()" has already tested that the
>> length
>> + // in number of characters is smaller than
>> BOOT_DEVICE_OPTION_MAX,
>> + // final '\0' included. We can thus copy the string for editing
>> + // using "CopyMem()". Furthermore, note that in the case of an
>> Unicode
>> + // string "StrnCpy()" and "StrCpy()" can not be used to copy
>> the
>> + // string because the data pointed to by
>> "BootOption->OptionalData"
>> + // is not necessarily 2-byte aligned.
>> + //
>> + if (IsUnicode) {
>> + CopyMem (
>> + UnicodeCmdLine, BootOption->OptionalData,
>> + MIN (sizeof (UnicodeCmdLine),
>> + BootOption->OptionalDataSize)
>> + );
>> + } else {
>> + CopyMem (
>> + CmdLine, BootOption->OptionalData,
>> + MIN (sizeof (CmdLine),
>> + BootOption->OptionalDataSize)
>> + );
>> + }
>> }
>> + } else {
>> + UnicodeCmdLine[0] = L'\0';
>> + IsPrintable = TRUE;
>> + IsUnicode = TRUE;
>> }
>> - } else {
>> - UnicodeCmdLine[0] = L'\0';
>> - IsPrintable = TRUE;
>> - IsUnicode = TRUE;
>> }
>>
>> // We do not request arguments for OptionalData that cannot be printed
>> @@ -909,7 +989,6 @@ struct BOOT_MAIN_ENTRY {
>> { L"Boot Manager", BootMenuManager },
>> };
>>
>> -
>> EFI_STATUS
>> BootMenuMain (
>> VOID
>> @@ -929,6 +1008,12 @@ BootMenuMain (
>> BootOption = NULL;
>> BootMainEntryCount = sizeof(BootMainEntries) / sizeof(struct
>> BOOT_MAIN_ENTRY);
>>
>> + if (FeaturePcdGet (PcdBdsLinuxSupport)) {
>> + // Check Linux Loader is present
>> + Status = LocateEfiApplicationInFvByGuid (&mLinuxLoaderAppGuid,
>> &mLinuxLoaderDevicePath);
>> + ASSERT_EFI_ERROR (Status);
>> + }
>> +
>> while (TRUE) {
>> // Get Boot#### list
>> BootOptionList (&BootOptionsList);
>> --
>> 2.1.1
>>
>>
>>
>> ------------------------------------------------------------------------------
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>>
>
>
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