The sx260 is now booting nicely via tftp.
I don't know if I need to make a separate post, but don't know how to install from a basic image like a basic cdrom iso. When I boot into the setup, it requires that I have a Debian mirror set up. I have looked around this forum and found one thread that said a separate partition was needed for each image if I couldn't use a mirror for Debian. It also included a link to a tutorial on how to make a multi-distro tftp server on ubuntu, but that tutorial didn't give a way to avoid connecting to the net to install the system.
Finally, I came across a site on backported d-i images, but it said:
You can't use CD and hd-media directly
for network installation via TFTP,
because the configuration step is different.
Use netboot.tar.gz for TFTP installation
and mount CD image on your Web server
to get a custom kernel and files.
Does that mean I'll need to throw up a quick webserver, make my own little mirror for the image I want, and hack some file in the /tftdboot so it shows up? I can do that, but if there were just some way to point it to the cdrom on the tftp server...