Date: Fri, 26 Apr 1996 11:11:20 +0930 (CST) From: Michael Smith <msmith@atrad.adelaide.edu.au> To: alk@Think.COM (Tony Kimball) Cc: questions@freebsd.org Subject: Re: bounce buffers Message-ID: <199604260141.LAA27457@genesis.atrad.adelaide.edu.au> In-Reply-To: <199604250653.BAA01917@compound.Think.COM> from "Tony Kimball" at Apr 25, 96 01:53:51 am
next in thread | previous in thread | raw e-mail | index | archive | help
Tony Kimball stands accused of saying: > > Under what circumstances are bounce buffers indicated? In a system with an ISA busmaster and more than 16M of RAM. Currently, this means systems using Adaptec, Ultrastor 14f, WD7000 or Buslogic busmaster SCSI controllers on the 'aha' 'uha' 'wds' or 'bt' drivers, systems with Lance- or PC-Net ethernet controllers on the 'lnc' driver on ISA-bus cards or systems using the 'asc' hand scanner driver. A quick scan of /sys/i386/isa doesn't turn up any other candidates, but I may have missed something. > 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. Not correct. -- ]] Mike Smith, Software Engineer msmith@atrad.adelaide.edu.au [[ ]] Genesis Software genesis@atrad.adelaide.edu.au [[ ]] High-speed data acquisition and (GSM mobile) 0411-222-496 [[ ]] realtime instrument control (ph/fax) +61-8-267-3039 [[ ]] Collector of old Unix hardware. "Where are your PEZ?" The Tick [[
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199604260141.LAA27457>