STM32MP15 U-Boot

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This article briefly describes the STM32MP15x lines support in U-Boot.

1. STM32MP15x lines support[edit source]

For detailed information, please read the file in the delivered U-Boot code = doc/board/st/stm32mp1.rst or the stm32mp1 documentation generated by make htlmdocs^[1].

Also available in official U-Boot Git.

Code :

arch/arm/mach-stm32mp : arch specific code for STM32 Arm^® Cortex^® MPUs
board/st/common : STMicroelectronics common code
board/st/stm32mp1 : generic STMicroelectronics board for STM32MP1 Series
drivers/*/*stm32* : drivers

Configuration Files:

defconfig file
- configs/stm32mp15_basic_defconfig
- configs/stm32mp15_trusted_defconfig
config files
- include/configs/stm32mp1.h
STM32MP15_device_tree in arch/arm/dts : stm32mp15*.dts*
- <Device tree>.dts : same as kernel
- <Device tree>-u-boot.dtsi : addition for u-boot automatically included in build process

2. Selecting targets : choose defconfig and Device Tree[edit source]

The STM32 MPU boot chain is supported by one U-Boot configuration with defconfig = stm32mp15_trusted_defconfig

Several boards are supported with the associated device-tree (same name as kernel):

Board part number	Device tree	Description
STM32MP157A-EV1 Evaluation board	stm32mp157a-ev1	MB1262+MB1263
STM32MP157C-EV1 Evaluation board	stm32mp157c-ev1
STM32MP157D-EV1 Evaluation board	stm32mp157d-ev1
STM32MP157F-EV1 Evaluation board	stm32mp157f-ev1
STM32MP157A-DK1 Discovery kit	stm32mp157a-dk1	MB1272
STM32MP157D-DK1 Discovery kit	stm32mp157d-dk1	MB1272
STM32MP157C-DK2 Discovery kit	stm32mp157c-dk2	MB1272+MB1407
STM32MP157F-DK2 Discovery kit	stm32mp157f-dk2	MB1272+MB1407

For information the 'Evaluation' daughter-board only (MB1263 without MB1262) is also supported by stm32mp15*-ed1.dts device tree files.

3. Compilation[edit source]

see U-Boot_overview#U-Boot_build

With the defconfig file: stm32mp15_trusted_defconfig

  make stm32mp15_trusted_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 ouput file is u-boot.stm32.

4. SPL compilation[edit source]

The alternate boot chain with SPL is also supported by "stm32mp15_basic_defconfig" but only for U-Boot_SPL:_DDR_interactive_mode

The resulting U-Boot files are located in your build directory:

u-boot-spl.stm32 : FSBL = SPL binary with STM32 image header, loaded by ROM code
u-boot.img : SSBL = U-Boot binary with U-Boot image header (uImage), loaded by SPL

Warning

This alternate boot chain with SPL is not supported/promoted by STMicroelectronics to make product.

5. Examples[edit source]

5.1. STM32MP157F-EV1 Evaluation board [edit source]

  make stm32mp15_trusted_defconfig
  make DEVICE_TREE=stm32mp157f-ev1 all

5.2. STM32MP157C-EV1 Evaluation board [edit source]

  make stm32mp15_trusted_defconfig
  make DEVICE_TREE=stm32mp157c-ev1 all

5.3. STM32MP157D-DK1 Discovery kit [edit source]

  make stm32mp15_trusted_defconfig
  make DEVICE_TREE=stm32mp157d-dk1 all

5.4. STM32MP157C-DK2 Discovery kit [edit source]

Using export to select the device tree

  export KBUILD_OUTPUT=../build/stm32mp15_trusted
  export DEVICE_TREE=stm32mp157c-dk2
  make stm32mp15_trusted_defconfig
  make all

5.5. Custom board with external device tree[edit source]

  make stm32mp15_trusted_defconfig
  make EXT_DTB=stm32mp151a-myboard.dtb all

5.6. SPL for STM32MP157F-EV1 Evaluation board [edit source]

  make stm32mp15_basic_defconfig
  make DEVICE_TREE=stm32mp157f-ev1 all

↑ https://u-boot.readthedocs.io/en/stable/board/st/stm32mp1.html

[1] ttps://u-boot.readthedocs.io/en/stable/board/st/stm32mp1.html

[1]