OpenAMP_TTY_echo_wakeup can't manage to wakeup M4

[SScar.2]

Hi there,

I'm developing on a STM32MP157 custom board. I'm trying to work with power modes, and I tried to import the OpenAMP_TTY_echo_wakeup example inside our M4 firmware.

I already had the IPCC module set up and I use virtUart periperal without any problem.

I can send the "*stop" message and I can see that the M4 stops working (and also consumes less), however if I try to send "echo "wakeup" >/dev/ttyRPMSG0" the M4 won't wakeup (the last trace says [00033.410][INFO ]Going into CStop mode ).

Is there anything that may be set in the devicetree that i'm not setting? I have a wakeup button to exit from A7 Cstop that works fine.

Thanks so much

EDIT: probably the clocks (specially M4 side) are not the same. Is there any configuration preferable?

[Olivier GALLIEN]

Hi @SScar.2​ ,

Did you experiment "OpenAMP_TTY_echo_wakeup" on one ST board first ?

Did you notice that such example requires a Device Tree extension profile named "stm32mp157c-dk2-m4-examples" in order to properly allocate the involved resources ?

I you don't find root cause, on next iteration please share your dts and logs.

Olivier

[SScar.2]

Hi @Community member​ ,

first of all, thanks for your reply!

First question: No, I didn't test it on the dev board (I have an STM32MP157F-DK2) because I took for granted that on the dev board works without problems (I trust ST a lot :D )

Second question: No, I didn't notice that, and it's exactly the answer I needed!

I will let you know if I'm able to solve the problem,

Thanks a lot for the support

Simone

PS: It may sounded as a stupid question, but I'm not familiar with M4 examples, and I dind't read anything about dts dependencies in readme file in examples folder!

[Olivier GALLIEN]

Hi @SScar.2​ ,

Yes you're right, I discover also that readme file not mention the DTS dependencies.

Information is spread in Wiki:

https://wiki.st.com/stm32mpu/wiki/STM32CubeMP1_Package_release_note_-_v1.6.0#Available_projects

STM32CubeMP1 Package - stm32mpu

I will report this for enhancement.

Olivier