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The UARTs themselves were already present, just not configured under any alias. Follow [ArduPilot UART naming for this board](https://ardupilot.org/plane/docs/common-pixracer-pro.html#default-uart-order), out of necessity: it's the only combination that makes sense and is understood by QGroundControl. (For example, I've attempted configuring the additional UARTs as `_EXT1` and `_EXT2`, but only `_EXT2` was understood by QGC.) Trying to actually use the FrSky telemetry port for anything without configuring FrSky telemetry on a different port may be impossible without modifying the board's `init/rc.board_extras`. (Should that script be modified to check if the port is used for anything else?) Skip naming the RC input port. Fixes #21455.