Date: Tue, 18 Feb 1997 01:29:09 -0800 From: David Greenman <dg@root.com> To: Jason Thorpe <thorpej@nas.nasa.gov> Cc: Christoph Kukulies <kuku@gilberto.physik.rwth-aachen.de>, freebsd-hackers@freefall.freebsd.org Subject: Re: ccd and bounce buffers Message-ID: <199702180929.BAA04915@root.com> In-Reply-To: Your message of "Mon, 17 Feb 1997 22:29:15 PST." <199702180629.WAA18272@lestat.nas.nasa.gov>
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>[ note, this reply is directed more at whomever integrated the ccd > into freebsd, and/or has hacked on it in freebsd since then... ] > >On Mon, 17 Feb 1997 17:13:52 +0100 (MET) > Christoph Kukulies <kuku@gilberto.physik.rwth-aachen.de> wrote: > > > Is it definite that ccd doesn't work for ISA (be it SCSI or IDE) > > due to bounce buffers being required? > >So, maybe I'm missing how things work in the FreeBSD world, but what >on earth does bounce buffers have to do with the ccd? The ccd is >a layered driver, which knows nothing about the underlying component >(or, at least, that's how it's _supposed_ to work, and is how it works >in NetBSD). > >Really, any dependency on bounce buffers out side of specific scsi >controller drivers is just plain broken. There is no dependency that I know of in FreeBSD. Bounce buffers are handled in the generic SCSI layer (via a machine-independant callout), and shouldn't be affected by ccd. I don't know where this rumor got started... -DG David Greenman Core-team/Principal Architect, The FreeBSD Project
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