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SubjectRe: Freeze Upon /dev/fd0 Use
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Also old ISA SCSI cards could use DMA (Adaptec 154x for example)
it also seems to me that there were some "high performance" cards of other
types (video capture that I know of) that used DMA

David Lang

On 2 Sep 1998, Linus Torvalds wrote:

> Date: 2 Sep 1998 04:03:27 GMT
> From: Linus Torvalds <torvalds@transmeta.com>
> To: linux-kernel@vger.rutgers.edu
> Subject: Re: Freeze Upon /dev/fd0 Use
>
> In article <Pine.LNX.3.96.980901211921.32757G-100000@mirkwood.dummy.home>,
> Rik van Riel <H.H.vanRiel@phys.uu.nl> wrote:
> >On Tue, 1 Sep 1998, Alan Cox wrote:
> >>
> >> Thats very interesting indeed. Do you know what patchlevel (about) this
> >> problem started ?
> >
> >Alan, don't bother. I have one of these no-name Triton boards
> >and the problem is reproducible under DOS too. I have no doubt
> >that OS/2 or Rhapsody will show the same behaviour...
>
> Really? More than one active DMA at a time just killing the machine
> completely?
>
> The good news is that ISA DMA is broken anyway, and it might just be an
> acceptable option to not even have a "BROKEN_DMA" config option, but
> just unconditionally refusing to allow two concurrent ISA DMA streams.
> The only things I know of that do ISA DMA is the floppy and old sound
> cards, and if that means that the sound skips while accessing the floppy
> I don't know if we really need to worry too much..
>
> Linus
>
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