It seems David Gilbert wrote:
> I've had my share of problems with this drive's DMA abilities. I'm
> convinced that it has none... even though it probes as such.
>
> ad0: <NEC Coporation DSE2550A/5DE0314> ATA-0 disk at ata0 as master
> ad0: ...
> ad0: 16 secs/int, 1 depth queue, DMA
>
> now... when I boot -v, I don't have a chance to write down what it
> says, but it will hang every time with the following output:
>
> ad0: ad-timeout: lost disk contact
> ata0: resetting drives -- mask=03 status0=50 status1=50 ..
>
> And that's it. It never prints out "done" which I see in many of the
> list messages. Is there a way of disabling DMA on a specific drive?
> I read a bit of the source, but didn't find any obvious documentation
> on the issue.
There is no way (yet) other than hacking the code, but I'm working on it...
-Søren
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