How to load stm32_ rpmsg_ SDB driver

[Wjian.1]

Hello, I'm doing an example of heterogeneous communication, refer to Wiki:https://wiki.st.com/stm32mpu/wiki/How_to_exchange_large_data_buffers_with_the_coprocessor_-_example.but I have encountered difficulties.When I generate the KO file and load it.However, the /dev/rpmsg-sdb device node was not generated, and you are required to help.

[ADeck]

After loading the kernel module, did you load the M4 firmware?