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SubjectRe: VIA IDE driver, v1.5 (final)
On Sun, Jul 23, 2000 at 08:35:16PM +0400, Khimenko Victor wrote:

> > Fortunately all UDMA transfers are protected by safe enough CRC to see
> > if a transfer fails. This way you can know your cable won't do UDMA/66
> > and switch to something slower. (UDMA/44 seems to work on most 40-wire
> > cables just fine). If that doesn't work, go even lower. Something like
> > modem autobauding ...
>
> If it'll work like modem autobauding here (connect with speed limit=14400
> and get 1.5Kbytes/second, connect with 33600 and spend 95% of time for
> retrains and thus transfer with 0.1Kbytes/second speed in the end) then
> better not...
>
> P.S. Sorry, could not resist...

:)))))))) It'd be like this if you let UDMA/66 enabled on a 40-wire
cable. What I meant is that after a *single* CRC error the speed would be
lowered to the next lower step (UDMA 100, 66, 44, 33, 16) and if even
UDMA/16 doesn't work, then fall back to PIO.

PS. You have damn bad modems if they behave like that. Mine just lower
the rate until the rate of retrains is acceptable. But yes, I have to
admit that Morotola 3265's tend to be expensive, yes.

--
Vojtech Pavlik
SuSE Labs

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