Using GPIO peripheral in STM32MP255 CortexM33 Coprocessor

[thareeqlws]

Hello,

I’m working with an STM32MP255 and want to access GPIOs from the Cortex-M33 coprocessor (not from the A-core/Linux side). I’m trying to understand the correct workflow and configuration steps so M33 firmware can drive/read GPIO pins. Specifically:

1. Are there any reference examples or official documentation showing how to assign GPIO pins to the Cortex-M33 coprocessor (M33 execution context) using device tree and RIFSC configuration on STM32MP255 / STM32MP2 devices?

2. Is there a step-by-step for RIFSC/firewall, resource assignment, or device tree overlays that shows how to move ownership of a GPIO from the Linux/A-core domain to the M33?

3. I’m using STM32CubeIDE to build the M33 firmware. Under SystemCore → GPIO there is no checkbox to select the Cortex-M33 execution context for a GPIO. Is that expected? If so, how should I configure ownership (is it a device tree  / RIFSC setting rather than a CubeIDE option)?

[Olivier GALLIEN]

Hi @thareeqlws

 

Does  Resource Isolation Framework overview - stm32mpu and STM32MP2 firewall configuration - stm32mpu provide you usefull pointers ? 

 

Olivier