Glenn Barry wrote:
I have two questions related to MIPS which someone may be able to help
with. Sorry for the long post.
Firstly I don't know if you've heard about the upgrading of the RM5200
300MHz CPU modules in SGI O2's with RM7000C 600MHz chips.
You can read about it at www.nekochan.net.
AFAIK, this ability isn't too supported anymore. The guy doing this has
apparently decided to quit. While I'm sure this doesn't make such
modifications impossible, it likely makes them more difficult and more expensive.
RM7000 has issues in Linux anyways. L3 cache is disabled (atleast on the
official SGI RM7000. Not sure if the 600MHz R7000 has an L3 cache as well),
and the scsi system isn't working in this system yet. There's possibly
others, but so few people have access to these kinds of machines that it makes
My question is about the possibility of someone helping out with
modifying the O2's PROM to recognise the RM7900 CPU from PMC-Sierra.
This would quite likely require direct access to the source code of the IP32
PROM. I think only IRIX developers have this access, and there are likely
license issues that would get in the way of modifying such code to allow for
detection of the RM7900
Modifying the binary is most assuredly way more difficult than gaining access
to ip32PROM source and modifying it directly (and solving license issues).
The level of change to the binary needed to make the ip32PROM detect a new CPU
would require extremely detailed knowledge of the binary format the ip32PROM
is in, SGI O2 systems, and how the PROM even functions. I'd wager a guess
that a super-skilled SGI engineer might possibly pull this off, given enough
Not having played with Linux on my O2, I don't know the details, but are
you able to run dual monitors with a second video card in the PCI slot?
Very unlikely in the current state, most video cards require initialization
from an x86 bios to function. There are ways around that, but then there's
the problem of the O2 PCI slot not operating at 100%.
If so does anyone think it would be possible to port a video card driver
to Irix to be able run a second screen. Unfortunately the dualhead
monitor adaptor isn't really an option as they are very difficult to
find and expensive.
About the only guy who can pull something like that off currently is Stan, the
guy who did the Octane port, since he reverse-engineered the Impact card on
Octanes. Short of that, not without documentation, and alot of time. And
you'll need more weight than that in the core of a neutron star to get SGI to
dig up those docs (since they're probably lost in a black hole anyways).
"Such is oft the course of deeds that move the wheels of the world: small
hands do them because they must, while the eyes of the great are elsewhere."