Earlier quoted context omitted.
It looks like just the headers, not the actual source code. Also iBoot is basically the "BIOS" of the phone. Just enough to get it up and running and then load iOS into memory and kick it off, so it wouldn't have drivers for things like the touch screen or accelerometer for example.
https://github.com/h1x0rz3r0/iBoot/blob/master/platform/s5l8... I'd disagree, this includes source code.
There are no interesting drivers there.