From owner-freebsd-current@FreeBSD.ORG  Fri Feb 15 13:47:39 2013
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.freebsd.org (mx1.FreeBSD.org [8.8.178.115])
 by hub.freebsd.org (Postfix) with ESMTP id 40DD3667;
 Fri, 15 Feb 2013 13:47:39 +0000 (UTC) (envelope-from jhb@freebsd.org)
Received: from bigwig.baldwin.cx (bigknife-pt.tunnel.tserv9.chi1.ipv6.he.net
 [IPv6:2001:470:1f10:75::2])
 by mx1.freebsd.org (Postfix) with ESMTP id 18335CE5;
 Fri, 15 Feb 2013 13:47:39 +0000 (UTC)
Received: from pakbsde14.localnet (unknown [38.105.238.108])
 by bigwig.baldwin.cx (Postfix) with ESMTPSA id E4F8BB926;
 Fri, 15 Feb 2013 08:47:37 -0500 (EST)
From: John Baldwin <jhb@freebsd.org>
To: Adrian Chadd <adrian@freebsd.org>
Subject: Re: Time to kill fdc ?
Date: Fri, 15 Feb 2013 08:21:26 -0500
User-Agent: KMail/1.13.5 (FreeBSD/8.2-CBSD-20110714-p25; KDE/4.5.5; amd64; ; )
References: <79955.1360494404@critter.freebsd.dk>
 <201302141635.15938.jhb@freebsd.org>
 <CAJ-VmokUhi-EgtwEOBqZMOmp-DOwj4OSweHVg5Lcu3b_U_cVvA@mail.gmail.com>
In-Reply-To: <CAJ-VmokUhi-EgtwEOBqZMOmp-DOwj4OSweHVg5Lcu3b_U_cVvA@mail.gmail.com>
MIME-Version: 1.0
Content-Type: Text/Plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Message-Id: <201302150821.26154.jhb@freebsd.org>
X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.2.7
 (bigwig.baldwin.cx); Fri, 15 Feb 2013 08:47:38 -0500 (EST)
Cc: Poul-Henning Kamp <phk@phk.freebsd.dk>, freebsd-current@freebsd.org,
 "C. P. Ghost" <cpghost@cordula.ws>, current@freebsd.org
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
 <freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-current>, 
 <mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
 <mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 15 Feb 2013 13:47:39 -0000

On Thursday, February 14, 2013 9:45:22 pm Adrian Chadd wrote:
> On 14 February 2013 13:35, John Baldwin <jhb@freebsd.org> wrote:
> 
> > ISA bounces anything above 16GB.  They are bouncing.  I know it works for some
> > people as I fixed a bug in the ISA bounce buffer code somewhat recentish:
> 
> You mean 16MB, right?

Yes, doh!

> There's a secondary bounce buffer thing needed for 32 bit PCI devices
> on a 64 bit machine with > 4 GB of physical RAM, right?

That is handled via the tags passed to bus_dma.  ISA DMA doesn't currently
use bus_dma but reimplements its own bounce handling.

-- 
John Baldwin