From owner-freebsd-questions Thu Apr 25 13:44:31 1996 Return-Path: owner-questions Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id NAA08868 for questions-outgoing; Thu, 25 Apr 1996 13:44:31 -0700 (PDT) Received: from riley-net170-164.uoregon.edu (riley-net170-164.uoregon.edu [128.223.170.164]) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id NAA08861 for ; Thu, 25 Apr 1996 13:44:28 -0700 (PDT) Received: (from dwhite@localhost) by riley-net170-164.uoregon.edu (8.6.12/8.6.12) id NAA23443; Thu, 25 Apr 1996 13:26:26 -0700 Date: Thu, 25 Apr 1996 13:26:26 -0700 (PDT) From: Doug White Reply-To: dwhite@resnet.uoregon.edu To: Tony Kimball cc: questions@freebsd.org Subject: Re: bounce buffers In-Reply-To: <199604250653.BAA01917@compound.Think.COM> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-questions@freebsd.org X-Loop: FreeBSD.org Precedence: bulk On Thu, 25 Apr 1996, Tony Kimball wrote: > > Under what circumstances are bounce buffers indicated? > Are they not indicated in all systems using >16MB DRAM? > My impression was that all such systems would require > bounce buffers in order to support DMA generally, while > no other systems would require bounce buffers. AFAIK they are only needed for machines with more that 16MB of RAM. Otherwise you can leave them out. They don't cause any problems on machines they don't help though. Doug White | University of Oregon Internet: dwhite@resnet.uoregon.edu | Residence Networking Assistant http://gladstone.uoregon.edu/~dwhite | Computer Science Major