The routine I tested was stm32mp157\STM32Cube_FW_MP1_V1.0.0\Projects\STM32MP157C-DK2\Applications\OpenAMP\OpenAMP_TTY_echo, The test method is guided by the following address, https://wiki.st.com/stm32mpu/wiki/Getting_started/STM32MP1_boards/STM32MP1...