[ubuntu-us-ut] powerpc kernel issue

[Daniel]

I am having troubles netbooting a powerpc machine with dapper (LTS).

I am using ubuntu's netboot:
http://archive.ubuntu.com/ubuntu/dists/dapper/main/installer-powerpc/current/images/powerpc/netboot/
in my tftp server root.  I see that my client is accessing the vmlinux
file provided.  When I netboot I get
"
VFS: Cannot open root device "<NULL>" or unknown-block(0,1)
Please append a correct "root=" boot option
"

If I netboot yaboot I get:
"
Invalid memory access at <various numbers>
"
Then it continues on to an open firmware prompt with the options to
"mac-boot" or "shut-down"

I have looked online for a couple days now and tried several different
things and am finally coming to the local experts.

-Daniel