Re: ide.2.4.1-p3.01112001.patch

[TimO <hairballmt@mcn.net>]

Vojtech Pavlik wrote:
> 
> Ok, here goes the patch.
> 
> Note that with this patch, all VIA users will get IDE transferrates
> about 3 MB/sec as opposed to about 20 MB/sec without it (and with
> UDMA66).
> 
> This patch disables automatic DMA on all VIA chipsets, including the
> ancient 82c561 for 486's, and up to the 686a UDMA66 chipset.
> 
> Also note that enabling the DMA later with hdparm -X66 -d1 or similar
> command is not safe, and usually works by pure luck on VIA chipsets.
> This however, would need some non-minor changes to the generic code to
> fix.
> 
> But perhaps it's still worth ...
> 
> --
> Vojtech Pavlik
> SuSE Labs
> 
>

_ouch_  Will -X66 -d1c1m16 be as stable with this patch as version 2.1e
has been for me??  It has always (auto)set transfer speeds properly and
I have never seen corruption with my 686a -- 'cept when patching from
test11-pre7 to test12-pre1, and I'm pretty sure that was from other
factors.

===============
-- Tim
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