Re: Issues with older wd* / IDE on various platforms

[Jaromír Doleček <jaromir.dolecek%gmail.com@localhost>]

Le ven. 13 nov. 2020 à 22:31, Robert Swindells <rjs%fdy2.co.uk@localhost> a écrit :
>
>
> John Klos <john%ziaspace.com@localhost> wrote:
> >I've noticed problems in three places and only recently did it occur to me
> >that they may all be related.
>
> [snip]
>
> >All three of these machines have much older IDE, so I'm wondering what in
> >NetBSD changed that may've have caused this.
>
> I would guess that one thing all have in common is lack of DMA.
>
> I have been using a local patch for an ofppc machine that can only do
> PIO with the IDE controller, can try latest -current on it over the
> weekend.

That could very well be.

There is no more automatic mode downgrade from DMA to PIO any more, so
if the controller misadvertises DMA support, but it actually doesn't
work, then I/O will just fail.

Jaromir