Compile U-Boot - PanGuBoard DevelopmentKit

The PanGu development board supports eMMC, QSPI Flash, and SD Card mode startup.

Boot device	config file	Board version
support boot from SD，eMMC flash	stm32mp15_basic_defconfig	PanGu eMMC version

The PanGu development board uses U-Boot as the boot loader for the entire system. After building U-Boot, you get two files, u-boot-spl.stm32 and u-boot.img. U-boot-spl.stm32 in the spl directory, u-boot.img in the root directory of u-boot. Can be written to different storage devices.

After downloading the U-Boot code, unzip it in the working directory and make sure the current shell has loaded the build toolchain.

$ cd $HOME/PanGu
$ tar xvf U-Boot-i2som.tar.gz

U-Boot support multi boot types, boot chain，Basic boot and Trusted boot。

Basic boot

$ make pangu_basic_defconfig
$ make DEVICE_TREE=stm32mp157a-panguboard all

Trusted boot

$ make pangu_trusted_defconfig
$ make DEVICE_TREE=stm32mp157a-panguboard all

After the compilation is finished, you can view the current directory and the spl directory in the current directory, and you can see the corresponding file.

$ ls

api&nbsp;&nbsp;&nbsp;&nbsp; config.mk&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; cscope.po.out&nbsp; drivers&nbsp;&nbsp; include&nbsp;&nbsp; MAINTAINERS&nbsp; scripts&nbsp;&nbsp;&nbsp;&nbsp; tools&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; u-boot.dtb&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; u-boot.map

arch&nbsp;&nbsp;&nbsp; configs&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ctags&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; dts&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Kbuild&nbsp;&nbsp;&nbsp; Makefile&nbsp;&nbsp;&nbsp;&nbsp; spl&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; u-boot&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; u-boot-dtb.bin&nbsp; u-boot-nodtb.bin

board   cscope.files   disk           env

Kconfig&nbsp;&nbsp; net&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; System.map&nbsp; u-boot.bin&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; u-boot-dtb.img&nbsp; u-boot.srec

cmd     cscope.in

.out&nbsp; doc&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; examples&nbsp; lib&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; post&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; tags&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; u-boot.cfg&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; u-boot.img&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; u-boot.sym

common&nbsp; cscope.out&nbsp;&nbsp;&nbsp;&nbsp; Documentation&nbsp; fs&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Licenses&nbsp; README&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

test u-boot.cfg.configs  u-boot.lds
$ ls spl/

arch&nbsp;&nbsp; common&nbsp;&nbsp; dts&nbsp; include&nbsp;&nbsp;&nbsp;&nbsp; u-boot-spl&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; u-boot-spl-dtb.bin&nbsp; u-boot-spl-nodtb.bin&nbsp; u-boot-spl.stm32.log

board  disk     env

lib&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; u-boot-spl.bin&nbsp; u-boot-spl.lds&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; u-boot-spl-pad.bin

cmd&nbsp;&nbsp;&nbsp; drivers&nbsp; fs&nbsp;&nbsp; u-boot.cfg&nbsp; u-boot-spl.dtb&nbsp; u-boot-spl.map&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; u-boot-spl.stm32

After the build is complete, some files are generated, and the following is a description of the files

File name	Description
File name	Description
:--
spl/u-boot-spl.stm32	The SPL binary containing the STM32 information header is used for FSBL under the Basic boot chain
u-boot.img	The u-boot binary containing the UImage header is used for SSBL under the Basic Boot chain
u-boot.stm32	The u-boot binary containing the STM32 header, used for SSBL under the Trusted Boot chain
u-boot	U-Boot ELF file for GDB debugging
spl/u-boot-spl	ELF file of SPL, usually used for gdb debugging

Replace the U-Boot in SD card
When testing a new U-Boot program, you can use the SD card startup method, you can quickly verify that U-Boot starts normally, and you can write U-Boot to the corresponding partition of the SD card.

dd if=u-boot-spl.stm32 of=/dev/sdb1 conv=fdatasync
dd if=u-boot-spl.stm32 of=/dev/sdb2 conv=fdatasync
dd if=u-boot.img of=/dev/sdb3 conv=fdatasync

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