Also, it's not clear to me (I haven't really looked ) what, if any, files in the Debian rootfs are actually closed-source Nokia stuff; if any of those are there, it's technically a legal problem to distribute that rootfs. (Not practically a problem at this stage, but certainly something that should be cleared up.) Scripts to build any necessary packages containing limited-distribution stuff from your own firmware seem like a good solution here. But IANAL, of course.