probe: if we have a separate SWDIO input, use it For boards with a level-shifter on SWDIO for compatibility with 1.8V VDDIO. Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
Picoprobe allows a Pico / RP2040 to be used as USB -> SWD and UART bridge. This means it can be used as a debugger and serial console for another Pico.
Picoprobe documentation can be found in the Pico Getting Started Guide. See “Appendix A: Using Picoprobe”.