Re: [PATCH ht6560b] Force prefetch for some devices

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

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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@caiway.nl> 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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