Interrupt does not occur when EXTI and OpenAMP used together. The board listens rpmsg channel and does not see button interrupt

[HArsl]

Hi everyone,

I am newbie in embedded linux, sorry if I ask dummy question and I try to combine GPIO EXTI and OpenAMP examples of Stm32Mp157C-DK2. I have completely run both examples alone however when I combined them, the interrupt due to the button press does not happen and the board just listen to the remote message from the rpmsg channel when I debug. My aim is to send " Button pressed" message whenever button is pressed namely EXTI occurred. However, the board does not enter the EXTI callback. 

Thank you in advance,

Halil

[Olivier GALLIEN]

Hi @HArsl​ 

Assuming your code is correct around EXTI interrupt config, I would check if button GPIO is properly assigned to M4 context.

Did you boot linux with config "3:   stm32mp157c-dk2-m4-examples-sdcard", or equivalent dts, properly configuring user button on M4 context ?

Thx

Olivier

[HArsl]

I realized after asking my question that I have not played with device tree. I assume problem could be there, after trying that I will give a feedback.

Thank you very much.

Halil

[HArsl]

Dear Oliver,

Now, I am trying the GPIO assignment and regarding to your advice I am reading device tree reference. However, one point make me confused, I will configure device tree to assign GPIO and then I will upload it to the board. During boot will I choose config 3? I am confusing because OpenAMP will be used by both M4 and A7 and so assigning GPIO to the M4 can not communicate with A7 during OpenAMP. Sorry if I could not express my problem.

Best

Halil