From owner-freebsd-hackers@FreeBSD.ORG  Tue Sep 12 19:59:02 2006
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Date: Tue, 12 Sep 2006 13:58:08 -0600 (MDT)
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To: george+freebsd@m5p.com
From: "M. Warner Losh" <imp@bsdimp.com>
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Cc: freebsd-hackers@FreeBSD.ORG
Subject: Re: Wiring umass unit numbers
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In message: <200609012108.k81L8nKZ019777@m5p.com>
            george+freebsd@m5p.com writes:
: I have a USB floppy drive and a USB flash card reader/writer.  At
: various times, neither, one, or both devices are plugged into the
: computer.  Depending upon when each is plugged in, the floppy
: drive might become /dev/da0 and the flash reader/writer /dev/da1,
: or vice versa.  Is there a way to specify which should be which?

Presently, there's no way to wire them.  I'm working on some generic
changes that would allow easier wiring, but haven't expanded them yet
to include the bus specific code for usb.  However, since umass uses
cam there might be some code needed there as well (or not, I've not
even looked yet).

Warner