1. Load the Echo test firmware and RPMsg module:
echo image_echo_test > /sys/class/remoteproc/remoteproc0/firmware
echo start > /sys/class/remoteproc/remoteproc0/state
2. Run the test:
echo_test
The test starts.
3. Follow the on-screen instructions to complete the test.
4. After you have completed the test, unload the application:
echo stop > /sys/class/remoteproc/remoteproc0/state