STM32MP157 cortex M4 programming (.elf burning)from the Cortex A7

[srikanth]

We are generated a code from the Cube MX and written the application its working fine in debug mode through JTAG. But we want to put it into the Sd card . For this what is the procedure and how to enable the cortex M4 controller form A7.

[Olivier GALLIEN]

Hi @srikanth​ ,

You may found useful information related to M4 management in wiki, started from page :

https://wiki.st.com/stm32mpu/wiki/Coprocessor_management_overview

Hope it help

Olivier

[srikanth]

Thank you for the reply . We loaded the .elf file generated from the cube ide to the address 0xC2000000. after loading from serial link . the cortex M4 code is not running . That is M4 code is not running . We are new to the linux .

[PatrickF]

Hi @srikanth​ ,

I recommend that you read few other wiki pages

https://wiki.st.com/stm32mpu/wiki/Getting_started/STM32MP1_boards/STM32MP157x-DK2

https://wiki.st.com/stm32mpu/wiki/Boot_chain_overview

Regards.

[LudovicR]

Hi @srikanth​ 

For your information, inside STM32CubeIDE Cortex-M4 project you have RemoteProc/ that contains fw_cortex_m4.sh script used to load .elf

It is copied onto STM32MPU typically under /usr/local/projects/<your_project>_CM4/

You should be able to load your .elf launching this script:

cd /usr/local/projects/<your_project>_CM4/

fw_cortex_m4.sh start

Then, you have to update Linux in order to launch this script at boot time.

Best Regards,

Ludovic

[srikanth]

Thanks for the reply

1)Now i am able to start and run the M4 Processor through remote processor early boot.but i am unable to stop the M4 processor ,How can i do that?

2)How can i Allocate stack to Second A7 Processor in Uboot Level .

[LudovicR]

Hi @srikanth​ ,

You can stop the M4 processor using: ./fw_cortex_m4.sh stop

Not sure to get your second question, could you elaborate?

Best Regards;

LudovicR

[srikanth]

we are initializing all the peripherals in core 0(first A7) after that we are triggering a core 1(Second A7) by using Tamp registers Core 1 needs some stack to run the code . But I have a doubt i.e, how to allocate stack for for core 1.