> I'm trying to set up a system that will load a compressed root image > from the disk (eventually flash) into a ramdisk and run the root > filesystem from ram. I was wondering if there is an "rdev" type utility > for the PPC that lets the kernel know that it wants to load a compressed > image into ram and what device that image lives on.
That's the bootloader's job on PPC. With a sane OF implementation, your boot loader would be yaboot and something like initrd=<of-path to ramdisk> and append="root=/dev/ram" should do. Michael