This article briefly describes the STM32MP13x lines support in U-Boot.
1. STM32MP13x lines support[edit | edit source]
For detailed information, read the file in the delivered U-Boot code = doc/board/st/stm32mp1.rst or the documentation generated by make htlmdocs
: board/st/stm32mp1.html.
Code:
- arch/arm/mach-stm32mp : arch specific code for STM32 Arm® Cortex® MPUs
- arch/arm/mach-stm32mp/Kconfig : generic configuration for STM32 Arm® Cortex® MPUs
- arch/arm/mach-stm32mp/Kconfig.13x : specific configuration for STM32MP13x lines
- board/st/common : STMicroelectronics common code
- board/st/stm32mp1 : STMicroelectronics boards support for STM32MP1 Series
- drivers/*/*stm32* : drivers
Configuration files:
- defconfig file
- config files
- include/configs/stm32mp13_common.h : generic for STM32MP13x lines
- include/configs/stm32mp13_st_common.h : STMicroelectronics board for STM32MP13x lines
- STM32_MPU_device_tree in arch/arm/dts : stm32mp13*.dts*
- <Device tree>.dts: same as kernel
- <Device tree>-u-boot.dtsi: addition for u-boot automatically included in build process
- stm32mp13-u-boot.dtsi : SoC add-on file included in <Device tree>-u-boot.dtsi
2. Selecting targets: choose defconfig and device tree[edit | edit source]
The U-Boot configuration with defconfig is stm32mp13_defconfig.
The STM32MP13 boards are supported with the associated device tree (same name as kernel):
Board part number | Device tree | Description |
---|---|---|
STM32MP135F-DK Discovery kit | stm32mp135f-dk | MB1635 |
3. Compilation[edit | edit source]
see U-Boot_overview#U-Boot_build
For STM32MP135F-DK Discovery kit , the device tree is already selected in defconfig stm32mp13_defconfig
make stm32mp13_defconfig
make all
For other boards, you need to select the correct device tree
make stm32mp13_defconfig make DEVICE_TREE=<Device tree> all
The supported variables are:
- DEVICE_TREE: select in arch/arm/dts the device tree that is used.
- KBUILD_OUTPUT: change the destination directory for the build
- EXT_DTB: select external device tree.
The output files u-boot.dtb and u-boot-nodtb.bin are integrated in FIP.
Note: All the compiled devices trees are available in $KBUILD_OUTPUT/arch/arm/dts/*.dtb.
You can select them instead of u-boot.dtb without U-Boot recompilation.
4. U-Boot integration in FIP[edit | edit source]
U-Boot binary and its associated device tree are part of the FIP binary, created with TF-A Makefile option:
- BL33_CFG = u-boot.dtb
- BL33 = u-boot-nodtb.bin
or updated with fiptools
:
- --hw-config u-boot.dtb
- --nt-fw u-boot-nodtb.bin
Example for FIP update of STM32MP135F-DK Discovery kit :
fiptool --verbose update --nt-fw u-boot-nodtb.bin \ --hw-config u-boot.dtb \ fip-stm32mp135f-dk.bin DEBUG: Replacing nt-fw with .../u-boot-nodtb.bin DEBUG: Replacing hw-config with .../u-boot.dtb DEBUG: Metadata size: ... bytes DEBUG: Payload size: ... bytes
5. Examples[edit | edit source]
5.1. STM32MP135F-DK Discovery kit [edit | edit source]
make stm32mp13_defconfig
make all
or
make stm32mp13_defconfig make DEVICE_TREE=stm32mp135f-dk all
and
fiptool --verbose update --nt-fw u-boot-nodtb.bin --hw-config u-boot.dtb \ fip-stm32mp135f-dk.bin
5.2. STM32MP135F-DK Discovery kit with export[edit | edit source]
export KBUILD_OUTPUT=../build/stm32mp13 export DEVICE_TREE=stm32mp135f-dk make stm32mp13_defconfig make all
fiptool --verbose update --nt-fw $KBUILD_OUTPUT/u-boot-nodtb.bin \ --hw-config $KBUILD_OUTPUT/u-boot.dtb \ fip-stm32mp135f-dk.bin
5.3. Custom board with external device tree[edit | edit source]
make stm32mp13_defconfig make EXT_DTB=stm32mp131a-myboard.dtb all
fiptool --verbose update --nt-fw u-boot-nodtb.bin \ --hw-config u-boot.dtb \ fip-stm32mp131a-myboard.bin