Which is the best way to shutdown/asleep and start/wake up STLinux through the M4 MCU ?

[GRatt.1]

I am searching for the simplest way to do that, I think you ST engineers made this chip for this purpose so maybe there are intended ways to that

Thanks in advance

[Olivier GALLIEN]

Hi @GRatt.1​ 

Please refer to all documentation related to Low Power management on MP1 :

Wiki : https://wiki.st.com/stm32mpu/wiki/Power_overview

AN5109 : https://www.st.com/resource/en/application_note/dm00449434-stm32mp1-series-using-lowpower-modes-stmicroelectronics.pdf

Then you can find a sample project in CubeFirmware Package under Projects\STM32MP157C-DK2\Applications\OpenAMP\OpenAMP_TTY_echo_wakeup

See scenario number 2 :  System Run Mode with CA7 in CStop and CM4 in CRun

Which looks to be the one you are interested in. ( A7 wakeup from M4)

Note that shutdown/restart A7 while M4 is running is not supported.

Olivier