LinuxCNC-RIO - RealtimeIO for LinuxCNC based on FPGA (ICE40 / ECP5)

I'm doing some boards up that will use shift registers so I will do some testing, and see what happens. Worst case is I design it so that the shift register outputs aren't enabled until Linuxcnc is started and communicating with the FPGA. 

Cheers.
Russell.