That very helpful lakka link was actually what I used in trying to get things set up.
I’m not expecting RA to automagically know about my controller, I am expecting it to give me something other than “Couldn’t open joystick” when I run retroarch-joyconfig.
I can get the joysticks working in ZSNES, but that doesn’t give me full screen, and I would like to play full screen.
Edit: huh, would you look at that, there is a button to go to full screen in ZSNES. Maybe retroarch isn’t the way I will be going then, although it would be nice to have everything in one place and not jumping around from emulator to emulator depending on which game I want to play. But for now, a solution that works.