FreeBSD and for that matter NetBSD do not work on SUN blade 1500. Have you bother to check
the list of supported hardware?
Sparc port of FreeBSD is tier three or four architecture which in practical sense means that it was experimental at best when it was conceived and right now is dead. It never supported
SMP kernel on sparc64!
More or less the same goes for NetBSD even though NetBSD port was tier one architecture in the past and originally used by OpenBSD people to create OpenBSD port. NetBSD sparc64 is usable but very buggy.
What is exactly wrong with OpenBSD on your SUN Blade 1500? Most OpenBSD developers use that
exactly same station to hack the kernel. I use older SUN station when porting software.
Nobody supports Sparc hardware better than OpenBSD.
If you do not like OpenBSD go get the Solaris 10. You do not have much of a choice.
Cheers,
OKO
By the way Linux is a joke on SUN Blade 1500.