How to communicate pixhawk 2.1 and intel edison


I got my first FC Pixhawk 2.1(compatible Edison)
I install edison in pixhawk.
Run QGC, and pixhawk Installed PX4 Firmware and callibrated.

What should I do to communicate pixhawk and edison?
I want to get PX4 doc about pixhawk compatible edison.

Did not Intel cease sales of Edison (and Juro as well)?

but, pixhawk 2.1(latest version) is two type that Standard Verison and Intel Edison Compatible Version (communicated SERIAL2)
I want to control pixhawk to edison or other MCU remotely for external signal(lte, LoRa… etc)

ardupilot communicate edison.
px4 communicate other board.