I think you need to cut off the headers or something like that. Have a look at 
the script in /usr/mdec/binstall. 

Peter

> Heyyo,
> 
> I've set everything up to netboot a recently acquired 4/110, but I am
> having problems netbooting it.
> 
> Here's what the prom tells me:
> 
> >b
> 
> Diagnostic Auto-boot in progress...ie(0,0,0) 
> Using IP Address 206.86.41.25 = CE562919
> Booting from tftp server at 206.86.41.100 = CE562964
> Downloaded 29296 bytes from tftp server.
> 
> 
> Illegal instruction "0x00006FC0" was encountered at PC 0x00004004.