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

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

The following reply was made to PR kern/46195; it has been noted by GNATS.

From: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: kern-bug-people%NetBSD.org@localhost, gnats-admin%NetBSD.org@localhost, 
netbsd-bugs%NetBSD.org@localhost,
        cheusov%tut.by@localhost
Subject: Re: kern/46195: Unseen IDE CDROM drive on 6.0_BETA
Date: Thu, 15 Mar 2012 12:59:32 +0100

 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
 --