Alright, I found packages for the modules:
http://www.freewrt.org/downloads/1.0...m-1_mipsel.ipk
http://www.freewrt.org/downloads/1.0...m-1_mipsel.ipk
the modules installed and loaded fine, but now what? I can't find any printers in /dev to start p910nd with... is there anything else I need to install first? For the lack of an alternative (all of this being trial-and-error based), I installed kmod-usb-printer, but the module wouldn't load...