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To: linux-kernel@vger.kernel.org
From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: IDE/ATAPI in 2.5
Date: 15 Jul 2002 22:28:43 -0700
Organization: Transmeta Corporation, Santa Clara CA
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References: <Pine.LNX.4.10.10207112158000.20499-100000@master.linux-ide.org> <3D2E6506.7080006@zytor.com> <m165zhp9u1.fsf@frodo.biederman.org>
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Followup to:  <m165zhp9u1.fsf@frodo.biederman.org>
By author:    ebiederm@xmission.com (Eric W. Biederman)
In newsgroup: linux.dev.kernel
> > 
> > I'm talking specifically about ATAPI devices here.  As we have already covered,
> > not all ATA devices are ATAPI, but unless I'm completely off the wall, ATAPI is
> > SCSI over IDE, and should be able to be driven as such.  The lack of access to
> > that interface using the established interface mechanisms just bites.
> 
> ATAPI is SCSI like C is C++.  There are strong similarities but they
> are regulated by different groups, and have slightly different semantics.
> Last I checked cdrecord already compensates for those differences but they
> are there.
> 

This is a good analogy, and in that general vein don't forget there
are considerable differences between different versions of SCSI as
well.  Just like there are, in many ways, bigger differences between
K&R C and C99 than between contemporary C and C++.  It should be
possible to write code that handles either one, either generically
(obviously the best) or with appropriate conditionals.

	-hpa
-- 
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt	<amsp@zytor.com>
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