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Date: Wed, 10 Mar 2010 16:21:11 -0800
From: Andrew Sharp <andy.sharp@lsi.com>
To: "Kingsbury, Brent" <Brent.Kingsbury@lsi.com>
Subject: Re: Mips processor revision in Cougar
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On Wed, 10 Mar 2010 16:51:13 -0700 "Kingsbury, Brent"
<Brent.Kingsbury@lsi.com> wrote:

> Hi Andy,
> 
> Dave Olien and I were briefly chatting up here about a particular
> TuxStor issue he's working on, and we wanted to verify that the data
> caches in the MIPS processors are physically tagged (not virtually
> tagged).

Not virtually tagged ~:^)

> Dave found some old documentation (I think he found it just by web
> browsing), that says that the caches are physically tagged, but that
> document was dated back to 2002.  But I am left wondering, what MIPS
> processor revision are we using?  And can we find the manuals for it
> online somewhere?  (I've even tried looking at the photos from cougar
> bring-up, but the processors are buried under heat sinks concealing
> their secret identity).

2002 is quite recent for MIPS.  Most of these "modern" MIPS variants
are based on the MIPS-IV/MIPS-64 spec that was eons ago.  In other
words, back when I was a youngster.

We are using two Sibyte processors, the 1125 and 1480, currently, in
Cougars.  You can find the manuals in PDF form in

/n/hardware/Cougar/specs/blah-de-blah

password is docs2020

Let me know if you can't find them, I'll dig them up and email 'em to
ya.  If you really want an education, _See MIPS Run Linux_ is an
astounding book.  Simply a Bible.  It's the only one I've ever had to
use.  Nothing left out, lot's of Linux specifics, tons of historical
info, it's truely amazing.
