Other than the kernel (which you've already seen), the other open source code on the PhatBox has only trivial modifications. The only difference is that some printf's were removed, and the shell was modified to be able to run shell scripts with DOS CRLF instead of Unix LF.
Of course, PhatNoise must still provide you the source code under the GPL/LGPL if you still want it.
Well I've seen some of your posts to the vorbis tremor decoder dev mailing lists which made me think ya'll (phatnoise) might have made changes to other libraries in use on the box..
I think it would be good to get copies of all the software we can in the unlikley event that phatnoise gets bought out by a group who wishes to discontinue all support of the boxes and chooses not to disclose anything in the future or phatnoise (god forbid) closes its doors.
(even though we wouldnt be able to sign or use any of the code...
)