From owner-freebsd-hackers Mon Feb 17 22:47:26 1997 Return-Path: Received: (from root@localhost) by freefall.freebsd.org (8.8.5/8.8.5) id WAA06126 for hackers-outgoing; Mon, 17 Feb 1997 22:35:21 -0800 (PST) Received: from lestat.nas.nasa.gov (lestat.nas.nasa.gov [129.99.50.29]) by freefall.freebsd.org (8.8.5/8.8.5) with ESMTP id WAA06118 for ; Mon, 17 Feb 1997 22:35:19 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by lestat.nas.nasa.gov (8.7.5/8.6.12) with SMTP id WAA18272; Mon, 17 Feb 1997 22:29:16 -0800 (PST) Message-Id: <199702180629.WAA18272@lestat.nas.nasa.gov> X-Authentication-Warning: lestat.nas.nasa.gov: Host localhost [127.0.0.1] didn't use HELO protocol To: Christoph Kukulies Cc: freebsd-hackers@freefall.freebsd.org Subject: Re: ccd and bounce buffers Reply-To: Jason Thorpe From: Jason Thorpe Date: Mon, 17 Feb 1997 22:29:15 -0800 Sender: owner-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk [ 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 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. Jason R. Thorpe thorpej@nas.nasa.gov NASA Ames Research Center Home: 408.866.1912 NAS: M/S 258-6 Work: 415.604.0935 Moffett Field, CA 94035 Pager: 415.428.6939