STM32MP157-EV kit with led blink

[ABayl.2]

Hello, I have dual core STM32MP157F-EV evaluation kit. I can connect via ST-link and install an application (This is installing on M4). And when I press the reset button, the application is deleted because the M4 core is RAM. I want it to work again every time I reset it. How can I do that ? How can I create an application-specific yocto project?

[Erwan SZYMANSKI]

Hello @ABayl.2​,

You are right, M4 firmware are not reloaded by default at reset time, but you can configure it yourself with a little workaround.

As A7 cortex is consider as a kind of master for M4 cortex, it will start first. You can create a script placed in /etc/profile.d (this folder runs all the scripts inside after Linux boot time) that starts your M4 firmware with remoteproc interface. (see https://wiki.st.com/stm32mpu/wiki/Linux_remoteproc_framework_overview)

Kind regards,

Erwan

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[ABayl.2]

My own application I uploaded it to the card using ethernet via CubeIDE. Then I went to /usr/local/project on the card and copied the fw_cortex_m4.sh file inside the project to the /etc/profile.d folder. I pressed the reset button but nothing happened.

[Erwan SZYMANSKI]

Hello @ABayl.2​ ,

Did you not forget that this fw_cortex_m4.sh should be called with a "start" argument ?

If you want to use it, maybe try to do a such script in /etc/profile.d

#!/bin/sh
 
(cd <fw_script_dir> && ./fw_cortex_m4.sh start)

I was not complete in my first answer saying that it was not possible. We have solutions not recommended but I put you here the link of the article: https://wiki.st.com/stm32mpu/wiki/Linux_remoteproc_framework_overview#How_to_use_the_framework

Kind regards,

Erwan.

[ABayl.2]

Thanks Erwan. I will try it.