From here:

I recently started messing with it again and used an n64 controller instead. not only does it have more buttons, it also has less to connect, just + at pin 1 and at 6, and data at pin 7. as long as you put in

gamecon_gpio_rpi map=0,0,6,0



It starts right up on boot. You also need to then run

cd ~/RetroPie/emulators/RetroArch/tools

Then save the output to your Retropie config file (this is a lot easier if you do it by ssh, with copy paste into vi/nano) to:

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