netbooting newbie alert!

I have an 8500 with no hard drive, and im trying to netboot it
completely diskless from a freebsd file server.

0> boot enet

works fine - grabs the bootp info, grabs what its told to grab via
tftp.  Im not quite sure which file to grab - generic netbooting docs
say to grab the 2nd stage boot loader.  do I need one, or can I just
grab the kernel?  grabbing the kernel works to the point where i see
the spinning | then it dies with the message:

unrecognized Client Program format state not valid

can anyone help?

-j