Date: Wed, 21 Mar 2001 02:01:42 -0800 From: Mike Smith <msmith@freebsd.org> To: thomas@cuivre.fr.eu.org Cc: freebsd-hackers@freebsd.org Subject: Re: SCSI-over-* hacks Message-ID: <200103211001.f2LA1g502649@mass.dis.org> In-Reply-To: Your message of "Wed, 21 Mar 2001 10:52:50 %2B0100." <20010321105250.A35328@melusine.cuivre.fr.eu.org>
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> Le 2001-03-21, Mike Smith écrivait :
>
> > > Has anyone implemented/thought of implementing:
> > > - a CAM transport for ATAPI devices;
> > Yes. It's not a lot of work.
>
> Ah, interesting! Do you know if any source code is publicly available?
No, for various reasons it hasn't been done; primarily, the FreeBSD ATA
maintainer doesn't consider it worthwhile.
> > > - a CAM transport for USB scanners;
> > No; this wouldn't make much sense, since most USB scanners aren't SCSI
> > devices.
>
> Mine (Minolta Dimâge Scan Dual II, an Avision unit in disguise) is :)
Think about it for a moment.
SCSI is way of encapsulating scanner commands so that you can transport
them to the scanner. So is USB. The command set your scanner uses is
probably the same as the SCSI command set, but this is not what a CAM
transport would give you - it would only give you the layers beneath,
which would not be useful, since you already have this in the form of USB.
> > > - the Linux SCSI generic device (/dev/sg*)?
> > We already have a far superior mechanism (/dev/pass*)
>
> Think 'Linux binary-only software'...
Think "barfing up a prime rib, plus all the vegetables and gravy". 8)
--
... every activity meets with opposition, everyone who acts has his
rivals and unfortunately opponents also. But not because people want
to be opponents, rather because the tasks and relationships force
people to take different points of view. [Dr. Fritz Todt]
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