Boot Windows with UEFI Payload

SBL can boot Windows 10 by using UEFI Payload. EDK II includes UefiPayloadPkg to build an UEFI payload that SBL can launch.

This page provides a step-by-step on guide how to build SBL with UEFI Payload.


UEFI Payload Build Instructions


Visual Studio 2015 is used for building both the UEFI payload as well as SBL. PYTHON_HOME environment variable needs to be set


EDK II build relies on a set of tools provided in the BaseTools folder. This is the primary set of tools for processing EDK II content.

When EDK II is cloned fresh, a one time build of BaseTools is required and its done using the following command:

edksetup.bat rebuild


Please note that the open source UefiPayload source is designed to be a generic payload. It consumes SBL produced HOB data structures to get information about the platform like memory map, ACPI tables, etc. This basically allows the UefiPayload to be used with SBL without needing any platform porting.

To allow for the UefiPayload to be a generic payload, the payload default build includes an emulated UEFI Variable driver. This emulated variable driver maintains the UEFI variable storage in memory and is NOT persistent across any type of reboots.


This guide uses Apollo Lake platform platform as a reference for build instructions and commands.

STEP 1: Build UEFIPayload

We have verified this build with the following commit:

* edk2 repo: commit 42d8be0eaac5e7e109f487d4e241847e815b077a


git clone --recurse-submodules edk2
cd edk2
git checkout 42d8be0eaac5e7e109f487d4e241847e815b077a
git submodule update --recursive
build -a IA32 -a X64 -p UefiPayloadPkg\UefiPayloadPkgIa32X64.dsc -b DEBUG -t VS2015x86 -D BOOTLOADER=SBL

Example outputs:

- Done -
Build end time: 11:09:28, Apr.23 2019
Build total time: 00:01:48

The UEFIPAYLOAD.fd will be built in edk2\Build\UefiPayloadPkgX64\DEBUG_VS2015x86\FV

STEP 2: Build SBL with UEFIPayload

Download source code at the same level as edk2 source code:

git clone sbl

Copy UEFIPayload image:

mkdir sbl\PayloadPkg\PayloadBins
copy edk2\Build\UefiPayloadPkgX64\DEBUG_VS2015x86\FV\UEFIPAYLOAD.fd sbl\PayloadPkg\PayloadBins\UEFIPAYLOAD.fd

Insert the following line to file sbl\Platform\ApollolakeBoardPkg\CfgData\CfgData_Int_LeafHill.dlt:

GEN_CFG_DATA.PayloadId                   | 'UEFI'


cd sbl
python build apl -p "OsLoader.efi:LLDR:Lz4;UEFIPAYLOAD.fd:UEFI:Lzma"


python Platform\ApollolakeBoardPkg\Script\ -i <LEAFHILL_8MB_IFWI> -s Outputs\apl\ -o sbl_lfh_ifwi_uefi64.bin

<LEAFHILL_8MB_IFWI>: Leaf Hill 8MB IFWI image

Example outputs:

Patching Slim Bootloader Flash Map table ...
Flash map was patched successfully!
Creating IFWI image ...

The final generate IFWI can be found as sbl_lfh_ifwi_uefi64.bin (8MB in size) in the working directory

STEP 3: Flash

Use DediProg, you can flash sbl_lfh_ifwi_uefi64.bin to SPI flash on Leaf Hill CRB.

STEP 4: Install Windows 10 from USB flash drive

Follow to create Windows 10 USB installer.

Boot from USB flash drive and follow instructions on the screen to complete Windows installation.