/proc/ide was made optional in 2.6.22+ kernels and Fedora builds omit it. This breaks userspace tools, at least yaboot but possibly others. Please fix ASAP, the option is CONFIG_IDE_PROC_FS.
I'd probably be happy to fix yaboot (well ybin up) for 2.6.22+ Let me look into it.
Actually, ofpath :) I'm not sure if it's possible to fix without /proc/ide - it seems to be pulling some magic values out of it.
Let me poke tomorrow when I can get my hands on a box.
This is fixed by re-enabling CONFIG_IDE_PROC_FS in the kernel for now. Hopefully we'll be able to switch to libata for the pmac some time soon.
*** Bug 249891 has been marked as a duplicate of this bug. ***