I'm seeing this too on my PowerMac 9500, even with 2.6.18-rc7 from
<http://kernel-archive.buildserver.net/debian-kernel/>.
The kernel somehow loses the information where the initrd image is
placed in memory. The correct data is there in
arch/powerpc/kernel/prom_init.c:prom_check_initrd(), but in
init/initramfs.c:populate_rootfs() it's wrong, initrd_{start,end}
are both 0.
So this definitely looks like a kernel problem.
I'll continue to investigate.
Cheers,
Christian Aichinger
PS: Please CC me, I'm not subscribed to d-kernel.
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