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Date: Fri, 9 Sep 2005 21:04:33 +0200
From: Thomas Quinot <thomas@FreeBSD.ORG>
To: Claude Buisson <cbuisson@nerim.net>
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Cc: freebsd-current@freebsd.org
Subject: Re: 6.0-BETA4 changes numbering of atapicam devices
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* Claude Buisson, 2005-09-09 :

> acd0 -> cd0
> acd1 -> cd1

There is absolutely no notion of such mapping in ATAPI/CAM. The order
in which device numbers are assigned by the cd driver depends only on
CAM scan order. What ATAPI/CAM guarantees is that the master device
is target 0, and the slave is target 1:

> cd0 at ata1 bus 0 target 1 lun 0
                           ^
> cd1 at ata1 bus 0 target 0 lun 0
                           ^

The assignment of unit numbers by the cd driver is dependant on the
CAM scan order; you can force fixed numbering by wiring down the target
-> unit mapping in your hints file.

Thomas.