Re: kern/46195: Unseen IDE CDROM drive on 6.0_BETA

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Thu, Mar 15, 2012 at 08:50:05AM +0000, Aleksey Cheusov wrote:
>  I'm shocked. Changing CDROM drive to "master" has solved the problem.
>  Now it is recognized correctly. Could you please explain why it is not
>  recommended

In T13/1532D Volume 1 Revision 2a "Information Technology - AT Attachment
with Packet Interface ­ 7 Volume 1 (ATA/ATAPI-7 V1) ", chapter 5.15.2
"Device 1 only configurations":
        Host support of Device 1 only configurations is host specific.

(T13/1532D is the one I have in hands to look at, older ATA standards said
that this was an unsupported configuration).

The consequence of this is that you can't reliably detect a slave
device if there's no master, unless you accept to pay a 31s timeout on
the nonexistent master in this case.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--