hp700 newbie trying to netboot

I'm not 100% sure on this, but I'm trying to netboot and I'm getting:

IPL error: bad LIF magic.

I think this means I need a kernel of a special format, but I can't
find one and what I'm reading isn't clear on telling me how to make
one, if I need to make one.

I'm using the stuff from the latest snapshot right now, is there a LIF
image in there that I'm not seeing?

Thanks.

Andy