In this chapter there is a list of resources which include enough reading to make us experts in the field in record-time.
penguinppc.org our home for Linux on the PowerPC.
Kernel patches, utilities and hints for IBM PPC workstations with Carolina motherboard (like the 7248) by David Monro. (Including frame buffer support to actually get X up and working!)
Linux on the RS/6000 7043-140 another old but still popular IBM PReP Workstation. Page by Leigh Brown. This page also has E15 frame buffer patches for Linux-2.4.
Hollis Blanchard's page for installing Linux on the PowerSeries 850. Add this to David's and my pages, and you should be able to get LinuxPPC-2000 Q4 up on the 850 too :-)
The linuxppc mailing lists. Especially interesting is of course the workstation list.
More info about Linux on PReP machines by Kazunori Aoshima
IBM Sales Manual for the 7248-133 (Detailed description)
PReP specification documents from IBM
CHRP specification documents from IBM
Cross Development for Linux/PPC from i386 by Matt Porter
Of course, AIX should work like a dream...
Rumors have been spread that once up in a time, even Window NT and Sun Solaris could run on this machine. Oh, well. Don't.
NetBSD does of course work on PReP PowerPCs. It probably also works on your Remington typewriter from the early 50s. There is a a special page for our PReP architecture where the 7248 is mentioned explicit.