I've done this modification and created a pull request #247.
Please someone test default scenario. I have already bricked the loco deck so I haven't tested default settings, although the alternative pins flag in config.mk works. Thanks!
I guess you are referring to the Loco Deck? The IO_2 and IO_3 are optional config instead of RX1 and RX2 pins currently used. Please see schematics for details. What does one have to do to use IO_2 and IO_3 instead of RX1 and TX1 for the LOCO deck IRQ and RESET? I bridged the pads on the bottom sid...