mirror of
https://github.com/smaeul/u-boot.git
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The U-Boot source moves to https://source.denx.de/u-boot/u-boot.git effective 2021-02-28. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
178 lines
6.4 KiB
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178 lines
6.4 KiB
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.. SPDX-License-Identifier: GPL-2.0+
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.. sectionauthor:: Aiden Park <aiden.park@intel.com>
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Slim Bootloader
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===============
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Introduction
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------------
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This target is to enable U-Boot_ as a payload of `Slim Bootloader`_ (a.k.a SBL)
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boot firmware which currently supports QEMU, Apollolake, Whiskeylake,
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Coffeelake-R platforms.
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The `Slim Bootloader`_ is designed with multi-stages (Stage1A/B, Stage2, Payload)
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architecture to cover from reset vector to OS booting and it consumes
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`Intel FSP`_ for silicon initialization.
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* Stage1A: Reset vector, CAR init with FSP-T
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* Stage1B: Memory init with FSP-M, CAR teardown, Continue execution in memory
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* Stage2 : Rest of Silicon init with FSP-S, Create HOB, Hand-off to Payload
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* Payload: Payload init with HOB, Load OS from media, Booting OS
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The Slim Bootloader stages (Stage1A/B, Stage2) focus on chipset, hardware and
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platform specific initialization, and it provides useful information to a
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payload in a HOB (Hand-Off Block) which has serial port, memory map, performance
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data info and so on. This is Slim Bootloader architectural design to make a
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payload light-weight, platform independent and more generic across different
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boot solutions or payloads, and to minimize hardware re-initialization in a
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payload.
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Build Instruction for U-Boot as a Slim Bootloader payload
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---------------------------------------------------------
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Build U-Boot and obtain u-boot-dtb.bin::
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$ make distclean
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$ make slimbootloader_defconfig
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$ make all
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Prepare Slim Bootloader
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-----------------------
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1. Setup Build Environment for Slim Bootloader.
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Refer to `Getting Started`_ page in `Slim Bootloader`_ document site.
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2. Get source code. Let's simply clone the repo::
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$ git clone https://github.com/slimbootloader/slimbootloader.git
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3. Copy u-boot-dtb.bin to Slim Bootloader.
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Slim Bootloader looks for a payload from the specific location.
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Copy the build u-boot-dtb.bin to the expected location::
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$ mkdir -p <Slim Bootloader Dir>/PayloadPkg/PayloadBins/
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$ cp <U-Boot Dir>/u-boot-dtb.bin <Slim Bootloader Dir>/PayloadPkg/PayloadBins/u-boot-dtb.bin
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Build Instruction for Slim Bootloader for QEMU target
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-----------------------------------------------------
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Slim Bootloader supports multiple payloads, and a board of Slim Bootloader
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detects its target payload by PayloadId in board configuration.
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The PayloadId can be any 4 Bytes value.
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1. Update PayloadId. Let's use 'U-BT' as an example::
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$ vi Platform/QemuBoardPkg/CfgData/CfgDataExt_Brd1.dlt
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-GEN_CFG_DATA.PayloadId | 'AUTO'
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+GEN_CFG_DATA.PayloadId | 'U-BT'
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2. Update payload text base. PAYLOAD_EXE_BASE must be the same as U-Boot
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CONFIG_SYS_TEXT_BASE in board/intel/slimbootloader/Kconfig.
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PAYLOAD_LOAD_HIGH must be 0::
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$ vi Platform/QemuBoardPkg/BoardConfig.py
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+ self.PAYLOAD_LOAD_HIGH = 0
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+ self.PAYLOAD_EXE_BASE = 0x00100000
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3. Build QEMU target. Make sure u-boot-dtb.bin and U-BT PayloadId
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in build command. The output is Outputs/qemu/SlimBootloader.bin::
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$ python BuildLoader.py build qemu -p "OsLoader.efi:LLDR:Lz4;u-boot-dtb.bin:U-BT:Lzma"
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4. Launch Slim Bootloader on QEMU.
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You should reach at U-Boot serial console::
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$ qemu-system-x86_64 -machine q35 -nographic -serial mon:stdio -pflash Outputs/qemu/SlimBootloader.bin
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Test Linux booting on QEMU target
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---------------------------------
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Let's use LeafHill (APL) Yocto image for testing.
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Download it from http://downloads.yoctoproject.org/releases/yocto/yocto-2.0/machines/leafhill/.
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1. Prepare Yocto hard disk image::
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$ wget http://downloads.yoctoproject.org/releases/yocto/yocto-2.0/machines/leafhill/leafhill-4.0-jethro-2.0.tar.bz2
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$ tar -xvf leafhill-4.0-jethro-2.0.tar.bz2
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$ ls -l leafhill-4.0-jethro-2.0/binary/core-image-sato-intel-corei7-64.hddimg
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2. Launch Slim Bootloader on QEMU with disk image::
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$ qemu-system-x86_64 -machine q35 -nographic -serial mon:stdio -pflash Outputs/qemu/SlimBootloader.bin -drive id=mydrive,if=none,file=/path/to/core-image-sato-intel-corei7-64.hddimg,format=raw -device ide-hd,drive=mydrive
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3. Update boot environment values on shell::
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=> setenv bootfile vmlinuz
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=> setenv bootdev scsi
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=> boot
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Build Instruction for Slim Bootloader for LeafHill (APL) target
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---------------------------------------------------------------
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Prepare U-Boot and Slim Bootloader as described at the beginning of this page.
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Also, the PayloadId needs to be set for APL board.
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1. Update PayloadId. Let's use 'U-BT' as an example::
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$ vi Platform/ApollolakeBoardPkg/CfgData/CfgData_Int_LeafHill.dlt
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-GEN_CFG_DATA.PayloadId | 'AUTO
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+GEN_CFG_DATA.PayloadId | 'U-BT'
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2. Update payload text base.
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* PAYLOAD_EXE_BASE must be the same as U-Boot CONFIG_SYS_TEXT_BASE
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in board/intel/slimbootloader/Kconfig.
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* PAYLOAD_LOAD_HIGH must be 0::
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$ vi Platform/ApollolakeBoardPkg/BoardConfig.py
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+ self.PAYLOAD_LOAD_HIGH = 0
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+ self.PAYLOAD_EXE_BASE = 0x00100000
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3. Build APL target. Make sure u-boot-dtb.bin and U-BT PayloadId
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in build command. The output is Outputs/apl/Stitch_Components.zip::
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$ python BuildLoader.py build apl -p "OsLoader.efi:LLDR:Lz4;u-boot-dtb.bin:U-BT:Lzma"
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4. Stitch IFWI.
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Refer to Apollolake_ page in Slim Bootloader document site::
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$ python Platform/ApollolakeBoardPkg/Script/StitchLoader.py -i <Existing IFWI> -s Outputs/apl/Stitch_Components.zip -o <Output IFWI>
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5. Flash IFWI.
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Use DediProg to flash IFWI. You should reach at U-Boot serial console.
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Build Instruction to use ELF U-Boot
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-----------------------------------
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1. Enable CONFIG_OF_EMBED::
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$ vi configs/slimbootloader_defconfig
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+CONFIG_OF_EMBED=y
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2. Build U-Boot::
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$ make distclean
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$ make slimbootloader_defconfig
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$ make all
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$ strip u-boot (removing symbol for reduced size)
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3. Do same steps as above
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* Copy u-boot (ELF) to PayloadBins directory
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* Update PayloadId 'U-BT' as above.
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* No need to set PAYLOAD_LOAD_HIGH and PAYLOAD_EXE_BASE.
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* Build Slim Bootloader. Use u-boot instead of u-boot-dtb.bin::
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$ python BuildLoader.py build <qemu or apl> -p "OsLoader.efi:LLDR:Lz4;u-boot:U-BT:Lzma"
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.. _U-Boot: https://source.denx.de/
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.. _`Slim Bootloader`: https://github.com/slimbootloader/
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.. _`Intel FSP`: https://github.com/IntelFsp/
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.. _`Getting Started`: https://slimbootloader.github.io/getting-started/
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.. _Apollolake: https://slimbootloader.github.io/supported-hardware/apollo-lake-crb.html#stitching
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