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SubjectRe: Tyan s2466 stability
On 16 Jul 2002, Alan Cox wrote:

> On Tue, 2002-07-16 at 21:51, Kurt Garloff wrote:
> > > I've seen it with IDE burners too. I don't know what the cause is
> >
> > Strange SMI stuff, maybe?
> > Bugs with PCI arbitration that are recovered from but take time?
> >
> > You've probably already looked into those, though.
> I've read the errata but thats not given me any clues. The box is fast,
> including PCI bandwidth measurements but neither PCI card or SCSI
> streaming to tape or CD-R works well. The motherboard IDE works a treat
> and the 64bit slots give me excellent performance (but thats a raid card
> so I can't yet use it for tape)

according to the amd760mpx datasheet, stuff on the 32/33MHz bus isn't
allowed to busmaster while the 64/66MHz bus is operating at 66MHz. so that
means the 66MHz bus needs to be throttled to 33MHz either via a 3.3V 33MHz
card stuck in it, or that pretty blue jumper stuffed on the appropriate
FORCE 33MHz header on the board.

these kind of problems will cause things like loss of streaming due to the
inability to busmaster. both of my dual athlon systems here at cti have
that jumper shorted. sure, i still run into problems, but then again, what
chipset for amd processors doesn't have a whole load of issues? overall, i
can't say i'm satisfied with any athlon chipset on the market right now.
but, the 760mpx has far fewer issues than, say, any garden variety via
board. (no comments from the peanut gallery -- my mind is made up and in
this respect, your opinion means nothing to me. via sucks. end of story).
but, i digress.

aside from these rather annoying pci quirks and a sensors issue (who in
their right mind assigns the same i2c address for two different chips?!)
the board works quite well in the configuration i've got it in (beowulf

oh and all the devices on this board are fully acpi controlled. let it be
known that i hate acpi, and especially the headaches that it causes me.
the stock bios also sucks quite vigorously and should be avoided at all
costs (read: upgrade to the latest bios rev immediately).

if you need help integrating one of these boards into your system i may be
able to provide some insight.

good luck.

Kelsey Hudson
Software Engineer/UNIX Systems Administrator
Compendium Technologies, Inc (619) 725-0771

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