I have here a SGI Origin 200 (2x R10000, big-endian). I fiddled around
to get Debian-MIPS running, it worked more or less, booting the kernel
was the easier part (with a recent 2.6.9), I then mounted a NFS share
from an i386, where I debootstrap-ed a basic Sarge MIPS system, but that
did not fully work, he complained about libc6 missing, although it was
installed etc. I will try that again soon.
However, this is not meant to be a post asking for help, I rather wanted
to ask if my Origin could be useful for you Debian-MIPS developers - I
can not physically give it to you, my boss would not be too happy with
that I guess, but if maybe I put it online somewhere (with Linux or with
IRIX, the next week will show), would that be of any use for you?