It seems Sergei Vyshenski wrote:
> >The old Intel PIIX is know to have DMA problems, I never intended to
> >support it, but the current code (from luiqi IIRC) was found to be
> >sufficient IF the BIOS did its job right. I seems that we have a
> >BIOS here that doesn't setup things the way they should be, and the
> >DMA setup fails because of that. Is there any way you could upgrade
> >your BIOS ??
> >
> >-Søren
> >
>
> After more experiments:
> 1) A pair of any disks are ok as ad0 and ad1, both in dma mode.
> 2) In a pair ad0+ad2, disk ad2 (irrespective of disk make)
> is not mounted in dma that easy. BUT, if I wait long enough,
> (about 1 min) it says:
> "ata1: trying to fallback to PIO mode"
> after which I have ad0 in dma, ad2 in pio, and no further problems.
>
> Very clever behavior in such a case!
> Thanks a lot for your response.
You're welcome :)
> Do you know a way to say that I want just PIO for disk ad2?
Use sysctl on the hw.atamodes oid (man ata.4)
-Søren
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