[STM32MP257F-DK] Need some help understanding workflow and managing processors

[my_name_is_john]

Hi!

I am working on the STM32MP257F-DK board for a robotics project. For this, I want to map some of the GPIO to M33 in order to control the motors while the Linux of the A35 will run the ROS software. From what I understood is follows:

• I need to customise the device tree to give the permissions of the GPIO to M33 (I initially tried directly flashing with a STM32CubeIDE project and the mpu got reset)
• I need OpenAMP to communicate between the processors (A35 needs to send calculated moves to M33)

How to achieve it I am not sure and I am unable to do it. I went through the STM resources but I am finding it quite confusing.

I have installed the Developer-Package, Distribution-Package and Starter-Package as given in following documents:

https://wiki.st.com/stm32mpu/wiki/Getting_started/STM32MP2_boards/STM32MP257x-EV1/Develop_on_Arm%C2%AE_Cortex%C2%AE-A35/Install_the_SDK https://wiki.st.com/stm32mpu/wiki/STM32MPU_Distribution_Package#Installing_the_OpenSTLinux_distribution https://wiki.st.com/stm32mpu/wiki/Example_of_directory_structure_for_Packages

I successfully used OpenAMP with the default starter image and managed to send messages, but that ELF is not working on the image I compiled using BitBake. Also, even tough I installed these software correctly, I am not able to use "Setup OpenSTLinux". It does nothing when I press it. The Preferences/STM32Cube/OpenSTLinux SDK Manager does detect the version though. (My PC: Ubuntu 24.04 LTS and CubeIDE Version: 2.0.0).

My working directory tree output:

STM32MPU-Ecosystem-v6.2.0/
├── Developer-Package
│   ├── SDK
│   ├── STM32Cube_FW_MP2_V1.1.0
│   ├── STM32Cube_FW_MP2_V1.3.0
│   ├── stm32mp2-openstlinux-6.6-yocto-scarthgap-mpu-v26.02.18
│   └── stm32mp-openstlinux-6.6-yocto-scarthgap-mpu-v26.02.18
├── Distribution-Package
│   ├── build-openstlinuxweston-stm32mp2
│   └── layers
└── Starter-Package
    └── stm32mp2-openstlinux-6.6-yocto-scarthgap-mpu-v26.02.18

I managed to compile the default image by instructions using the distribution package, but I am unsure how can I modify the device tree there.

My questions are now:

1. The way how I am planning to distribute task is correct (bare metal pwm controller and ROS)?
2. Which toolchain I should use?
   • CubeMX + CubeIDE with Developer packege OR
   • Distribution package
3. What are good learning resource? A video tutorial would be of great help

Just for little background, I am quite new to this mpu system and I don't have prior experience with yocto. I have experience with microcontroller programming and desktop linux tough.

Thanks in advance!

[Olivier GALLIEN]

Hi @my_name_is_john 

Can you please share logs you can get when you test your ELF generated with Bitbake ? 

Thanks

Olivier