Re: [PATCH ht6560b] Force prefetch for some devices

[Jan Evert van Grootheest <j.e.van.grootheest@xxxxxxxxx>]

Alan, Bart,

It's been a while...

Alan Cox wrote:
> On Mon, 18 Feb 2008 13:50:02 +0100
> Jan Evert van Grootheest <j.e.van.grootheest@xxxxxxxxx> wrote:
>
>   
> > Prefetch needs to be set for some ide devices to work when connected to
> > a ht6560b interface. This was not always done properly, causing a system
> > with a HD and CD on the primary interface to not work properly. Or, in
> > effect, hang hard.
> >
> > This patch forces prefetch on devices before checking whether it
> > is necessary to change the settings in the interface
> >     
>
> Interesting, that is backwards to the docs and not something I've seen.
> If you are correct then pata_legacy also wants tweaking .
>   
I'm testing this... but lack some knowledge.
Is there some generic way to figure out wheter a device supports it?
What devices normally support prefetching? Disks only?
I already found out that CDs do not. But tapes? Floppies? What else can 
be there that might support prefetching?

Thanks,
Jan Evert

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