http://sunsolve.sun.com/handbook_private/Systems/SunBlade1000/SunBlade1000.html

Might need PROM patch 118323, and/or stuff as documented here: http://sunsolve.sun.com/data/816/816-1712/pdf/816-1712-10.pdf

You should be able to do a net boot/nfs install, if you have a working jumpstart server.

What release of Sol8 are you trying to install?