I'm using a Pixhawk 1 with Raspberry Pi 3 as the companion computer. I finally made it to communicate between Pixhawk and RPI via MAVProxy, following the instructions here http://ardupilot.org/dev/docs/raspberry-pi-via-mavlink.html
However, I've discovered that RPI can only communicate with Pixhawk at the boudrate 921600, and with any other boudrates, I can see only messy codes on my RPI terminal. What's more, I'm sure that I have correctly set the boudrate of Pixhawk before testing.
Is there any configurations I might have missed or is that an issue to be fixed? BTW I'm still in Copter 3.4.3 if that makes a difference.