This should be the most useless (for developers) page around here.
I have finally decided to completely erase everything on my Netwinder and load it with the DM-3.9-28 image. I have succeeded in booting it through tftp/nfs. However, tinkering with fstab caused it to now automatically reboot itself shortly after booting; obviously, the system in such a state is useless.
The system backup is finished, after almost a day of copying. After booting into the new DM image, I found that X does not work.
Back to square one: searching for the problem yields “XFree86 3.3 is no longer supported; use XFree86 4 instead&rdquo. I will now have to download Debian and see if Debian works.