Taken from http://www.netbsd.org/Ports/sparc64/faq.html#nosolarisinstall

How do I install without a second disk or without Solaris

If you have a CD-ROM in your Ultra Sparc you can fetch the ramdisk file 
system image and burn that on a CD. Note: this is not a valid ISO image, so 
you will need a CD-ROM mastering software that trusts you to know what you 
are doing. Cdrecord on NetBSD will do.


At 04:02 PM 6/14/2001 -0400, B. Cook wrote:
>I'm ready to take another shot at installing NetBSD on sparc64.. I'd like to
>do this without solaris, and I've not had much luck with netbooting it, as
>there is no solaris on the box...
>
>If I wanted to try this again,
>/pub/NetBSD/arch/sparc64/snapshot/20010518-1.5.1_BETA2 is where I would get
>the files that I think I would need...
>
>under the install dir, there is a miniroot dir, in there is a file of about
>2.8mb compressed, and in the ../../binary/kernel is a netbsd.GENERIC.gz
>kernel..
>
>can I uncompress the two files in a dir and make an iso out of them? or does
>the netbsd.GENERIC need to be in the bootable area of the CD?
>these are the options that I think I need to do this (if this is even the
>correct thing to do...)
>any help would be much appreciated..
>
>if this works, I'd like to install everything else, but as long as I might
>be making coasters, or something that still might not even have and
>installer.. I'd like it to go fast ;)  So I'm only going to include what it
>takes to make the thing possilby show some signs of improvement.
>
>   -B FILES, -sparc-boot FILES Set sparc boot image names
>   -sparc-label label text     Set sparc boot disk label
>
>I would like to thank anyone that took the time to read this, and hope that
>you might be able to help.
>
>Brian