I've done it (credit goes to Stephanie for the hack) :P its all in what configuration flags you use, if you know the size of the ram its common to just specify it, on a PC with tram slots its a requirement that you don't know how much you have until boot
not without having to do it myself :P
gpios can be accessed from userland in the same way you would on any linux system (look it up), on the hardware side, it's just a push to make (or break) switch, and a pull up (or down) resistor depending on what configuration you want to give the gpio
you'd need to convert it to serial and use the uart, or at least multiplex it in, joystick ports are just direct lines to the buttons and axes (hence the limit of 4 axis, 4 buttons or whatever it is)
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