I am trying to install netbsd/sparc 1.5 onto a headless but diskfull
sparc classic via serial console and net boot.

I have RARP, TFTP and bootparamd working to load the first stage but
can't find the ramdisk kernel mentioned in 

 http://www.netbsd.org/Documentation/network/netboot/local.install.html

to load the second stage.

Where can I find this?

Can I load it directly via TFTP in the first stage? (if not, why not?)

Thanks,

Chris.