Zephyr RPMSG Service for Cortex M4 on STM32MP157F-DK2

[ThinhNguyen]

I try to build a rpmsg sample app by following this instruction : https://docs.zephyrproject.org/latest/samples/subsys/ipc/rpmsg_service/README.html

The example repository here: https://github.com/zephyrproject-rtos/zephyr/tree/main/samples/subsys/ipc/rpmsg_service

It seems that the device tree overlay is missing for STM32MP157F-DK2, so I create one

/ {
chosen {
/*
* shared memory reserved for the inter-processor communication
*/
zephyr,ipc_shm = &mcuram2;
zephyr,ipc = &mailbox;
};

mcuram2: mcuram2@10000000 {
compatible = "mmio-sram";
reg = <0x10000000 0x40000>;
};

It is not working, please advice if the device tree is correct or not? and Is there any relation with Linux device tree?

thanks

[ArnaudP · Accepted solution]

Hello,

The rpmsg service you are trying to use is for communication between two MCUs running zephyr.
For the stm32mp15 please use this sample: https://github.com/zephyrproject-rtos/zephyr/tree/main/samples/subsys/ipc/openamp_rsc_table

It is dedicated to communication between a Zephyr running on Cortex-M4 and a Linux running on the Cortex-A7.

You can also have a look at rpmsg_multiservice example in the Open-AMP system reference github.
Associated doc: https://openamp.readthedocs.io/en/latest/demos/system_reference-ST.html