Where is the fw_cortex_m4.sh. in a STM32MP157C DK2 Yocto build?

[lsalv]

Hi all,

yesterday I just booted the amazing STM32MP1 DK2 device with a brand new Yocto build (st-image-weston). Can't find the fw_cortex_m4.sh . Is that available just in the STM32CubeMP1_Package or maybe I need to add another layer and build for another target?

[Olivier GALLIEN]

Hi,

fw_cortex_m4.sh is specific to an M4 firmware application.

You can find one in each Cube-M4-examples pre-load in the image here :

root@stm32mp1:/usr/local/Cube-M4-examples/STM32MP157C-DK2/Examples/

Olivier

[lsalv]

I think I'm missing something.

I build and flash the yocto OpenSTLinux then I was following this doc...

https://wiki.st.com/stm32mpu/index.php/OpenSTLinux_directory_structure

But now that I booted with a terminal on /dev/ttyACM0 I got this ...

Select the boot mode

1:   stm32mp157c-dk2-sdcard

2:   stm32mp157c-dk2-a7-examples-sdcard

3:   stm32mp157c-dk2-m4-examples-sdcard

And run some of them:

root@stm32mp1:/usr/local/Cube-M4-examples/STM32MP157C-DK2#

But means that those are built an pushed as separate images?

I can't find event the M4 images, like the OpenAMP_TTY_echo.elf, it's on the board but no in the Yocto build directory.

I'm sure I didn't get where this data comes from :D

[GwenaelT · Accepted solution]

You can find more informations about boot modes here :

https://wiki.st.com/stm32mpu/index.php/STM32CubeMP1_Package#Select_boot_mode_for_m4_examples

Otherwise the M4 firmware are also built in yocto image. You can find more informations here :

https://wiki.st.com/stm32mpu/index.php/STM32CubeMP1_Package#Introduction_to_m4projects_recipe

[lsalv]

Thank you very much.

This doc was exactly what I was looking for.

Thank you!