Pixhawk 4 mini debug port

What can I do with the debug port on the pixhawk 4 mini?

It’s stated as a “general” serial port… Can I use it for crsf?

Anyone?

I’ve changed my design and will be going with the RFD900 and frsky 2.4ghz rc.

But I would still like to know what if anything I can do with the debug port…

I’m not well versed in the arduPilot world…

I sure would appreciate some input…