[ubuntu-us-ut] PowerPC LTSP Not working

[Daniel]

I have used the following web pages as a tutorial for how to get LTSP
to work in a mixed architecture environment:

https://help.ubuntu.com/community/UbuntuLTSP/LTSPCrossArchSetup
http://elliot.ecowizards.com/wp/archives/2006/05/18/ltsp-booting-old-mac-hardware/

I am having problems booting the client.  It says it is "Please wait,
loading kernel" but just sits there.

My /etc/ltsp/dhcpd.conf file looks like this:
*********************************************************file***********************************
authoritative;

allow booting;
allow bootp;

subnet 192.168.0.0 netmask 255.255.255.0 {
  range 192.168.0.20 192.168.0.250;
  option domain-name "example.com";
  option domain-name-servers 192.168.0.1;
  option broadcast-address 192.168.0.255;
  option routers 192.168.0.1;
  option subnet-mask 255.255.255.0;
#  if substring( option vendor-class-identifier, 0, 9 ) = "PXEClient" {
#    filename "/ltsp/i386/pxelinux.0";
#  }
#  else{
#    filename "/ltsp/i386/nbi.img";
#  }
  filename "yaboot.conf";
  option root-path "/var/lib/tftpboot/";
}
*********************************************************end
file***********************************

This is the /var/lib/tftpboot directory:

*********************************************************shell***********************************
daniel at daniel-ubuntu:~$ ls -R /var/lib/tftpboot/
/var/lib/tftpboot/:
ltsp  yaboot  yaboot.conf

/var/lib/tftpboot/ltsp:
powerpc

/var/lib/tftpboot/ltsp/powerpc:
abi-2.6.17-10-powerpc         System.map-2.6.17-10-powerpc
config-2.6.17-10-powerpc      vmlinux
initrd.img                    vmlinux-2.6.17-10-powerpc
initrd.img-2.6.17-10-powerpc
*********************************************************end
shell***********************************

And here is the /opt/ltsp/powerpc directory:

*********************************************************shell***********************************
daniel at daniel-ubuntu:~$ ls /opt/ltsp/powerpc/
bin   cdrom  etc   initrd  media  opt   root  srv  tmp  var
boot  dev    home  lib     mnt    proc  sbin  sys  usr
*********************************************************end
shell***********************************

Note: powerpc does not use grub.  They use yaboot so yaboot.conf
should be like menu.lst.

Any help would be appreciated.
Thanks,
-Daniel