STM32MP15 U-Boot

This article briefly describes the {{#vardefine:info|}}{{#vardefine:dev|MP15x lines}}{{#vardefine:info| }}STM32{{#var:dev}}{{#var:info}} support in U-Boot.

{{#vardefine:info|}}{{#vardefine:dev|MP15x lines}}{{#vardefine:info| }}STM32{{#var:dev}}{{#var:info}} support

For detailed information, please read the file in the delivered U-Boot code = board/st/stm32mp1/README| |}} board/st/stm32mp1/README

Also available in official U-Boot Git.

Code :

• arch/arm/mach-stm32mp| |}} arch/arm/mach-stm32mp : arch specific code for {{#vardefine:info|}}{{#vardefine:dev| Arm^® Cortex^® MPUs}}{{#vardefine:info| }}STM32{{#var:dev}}{{#var:info}}
• board/st/stm32mp1| |}} board/st/stm32mp1 : generic STMicroelectronics board for {{#vardefine:info|}}{{#vardefine:dev|MP1 Series}}STM32{{#var:dev}}{{#var:info}}
• drivers/*/*stm32* : drivers

Configuration Files:

• defconfig file
  • configs/stm32mp15_basic_defconfig| |}} configs/stm32mp15_basic_defconfig
  • configs/stm32mp15_optee_defconfig| |}} configs/stm32mp15_optee_defconfig
  • configs/stm32mp15_trusted_defconfig| |}} configs/stm32mp15_trusted_defconfig
• config files
  • include/configs/stm32mp1.h| |}} include/configs/stm32mp1.h
• Device tree in arch/arm/dts | |}} arch/arm/dts
  • stm32mp157*-<board>.dts : same as kernel
  • stm32mp157*-<board>-u-boot.dtsi : addition for u-boot ( <<device tree>>-u-boot.dtsi automatically included in build process)

Selecting targets : choose defconfig and Device Tree

Each boot chain is supported by one U-Boot configuration with defconfig

Boot chain	defconfig	FSBL	SSBL	TEE support
Trusted Boot	stm32mp15_trusted_defconfig	TF-A	U-Boot u-boot.stm32	-
Trusted Boot with OP-TEE	stm32mp15_optee_defconfig	TF-A	U-Boot u-boot.stm32	yes
Basic Boot	stm32mp15_basic_defconfig	SPL u-boot-spl.stm32	U-Boot u-boot.img	-

The basic boot chain is not supported/promoted by STMicroelectronics to make product (see Boot chains overview for details).

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

Board part number	Description	Device tree
}}{{#vardefine:typ|}}{{#vardefine:typ| Evaluation board}}{{#vardefine:info|}}STM32MP157C-EV1{{#var:typ}} {{#var:info}}	MB1262+MB1263	|}} stm32mp157c-ev1 ]
STM32MP157C-ED1 Evaluation daughterboard	MB1263	|}} stm32mp157c-ed1 ]
}}{{#vardefine:typ|}}{{#vardefine:typ| Discovery kit}}{{#vardefine:info|}}STM32MP157A-DK1{{#var:typ}} {{#var:info}}	MB1272	|}} stm32mp157a-dk1 ]
}}{{#vardefine:typ|}}{{#vardefine:typ| Discovery kit}}{{#vardefine:info|}}STM32MP157C-DK2{{#var:typ}} {{#var:info}}	MB1272+MB1407	|}} stm32mp157c-dk2 ]

Compilation

see U-Boot_overview#U-Boot_build

With <mode> = 'basic', 'trusted' or 'optee'

 PC $> make stm32mp15_<mode>_defconfig
 PC $> make DEVICE_TREE=<device tree name> all

• 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

Examples

{{#vardefine:info|}}{{#vardefine:typ|}}{{#vardefine:typ| Evaluation board}}{{#vardefine:info|}}STM32MP157C-EV1{{#var:typ}} {{#var:info}} trusted boot

 PC $> make stm32mp15_trusted_defconfig
 PC $> make DEVICE_TREE=stm32mp157c-ev1 all

{{#vardefine:info|}}{{#vardefine:typ|}}{{#vardefine:typ| Discovery kit}}{{#vardefine:info|}}STM32MP157C-DK2{{#var:typ}} {{#var:info}} trusted boot

Using export to select the device tree

 PC $> export KBUILD_OUTPUT=../build/trusted
 PC $> export DEVICE_TREE=stm32mp157c-dk2
 PC $> make stm32mp15_trusted_defconfig
 PC $> make all

STM32MP157C-ED1 Evaluation daughterboard basic boot

 PC $> export KBUILD_OUTPUT=../build/basic
 PC $> make stm32mp15_basic_defconfig
 PC $> make DEVICE_TREE=stm32mp157c-ed1 all

Trusted boot chain with external device tree

 PC $> make stm32mp15_trusted_defconfig
 PC $> make EXT_DTB=boot/stm32mp157c-myboard.dtb all

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