26 Feb
2002
26 Feb
'02
2:59 p.m.
At 06:13 PM 2/26/2002 -0500, Gunther Schadow wrote:
Hello, for those of you who are not (or no longer :-)
subscribed to the
Quasijarus list, you still want to read this. This is Michael Sokolov
as we all love him: Passionate and knowledgeable about VAXen, and just
that. The project sounds kinda cool, if he delivers I'll want to get it.
regards
-Gunther
Hi there,
It's me again, your faithful 4.3BSD-Quasijarus maintainer. Sorry that I've
been
silent for a while... but guess what, I've got something cool, something that
may raise your hair...
[snip...]
I've been particularly impressed by Galileo
GT-64240 and GT-64260 system
controllers for MIPS and PowerPC respectively. So far I've only worked with
PowerPCs and GT-64260 and haven't looked at the 240 yet, but as I
understand it
the MIPS and PowerPC system buses are very similar and the 240 and the 260 are
essentially the same chip with minor mods.
That's what he gets for reading datasheets and not working with the real
parts. :)
The 642x0 parts have any restriction and problems that will basically rule out
their as a VAX controller; specifically lack of cache coherency when using the
onboard communications functions (serial/ethernet). Any VAX must have a
vectored
interrupt unit. The interrupt logic of 642x0 is severely limited and not
appropriate at all.
[My day job is keeping a NetBSD port to an embedded implementation using the
MPC74xx and GT64260 parts running. I have no love for the 64260.]
--
Matt Thomas Internet: matt(a)3am-software.com
3am Software Foundry WWW URL: http://www.3am-software.com/bio/matt/
Cupertino, CA Disclaimer: I avow all knowledge of this message