From owner-freebsd-sparc64@FreeBSD.ORG  Wed Nov 19 19:20:52 2003
Return-Path: <owner-freebsd-sparc64@FreeBSD.ORG>
Delivered-To: freebsd-sparc64@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id DE28C16A4D0
	for <sparc64@freebsd.org>; Wed, 19 Nov 2003 19:20:52 -0800 (PST)
Received: from mail.gmx.net (pop.gmx.net [213.165.64.20])
	by mx1.FreeBSD.org (Postfix) with SMTP id A21DA43F85
	for <sparc64@freebsd.org>; Wed, 19 Nov 2003 19:20:50 -0800 (PST)
	(envelope-from tmoestl@gmx.net)
Received: (qmail 28828 invoked by uid 65534); 20 Nov 2003 03:20:47 -0000
Received: from p508E720C.dip.t-dialin.net (EHLO timesink.dyndns.org)
	(80.142.114.12)
	by mail.gmx.net (mp013) with SMTP; 20 Nov 2003 04:20:47 +0100
X-Authenticated: #5374206
Received: by raven (Postfix, from userid 1001)
	id 269441AB; Thu, 20 Nov 2003 04:20:46 +0100 (CET)
Date: Thu, 20 Nov 2003 04:20:46 +0100
From: Thomas Moestl <t.moestl@tu-bs.de>
To: Kris Kennaway <kris@obsecurity.org>, sos@freebsd.org,
	sparc64@freebsd.org
Message-ID: <20031120032045.GB759@timesink.dyndns.org>
Mail-Followup-To: Kris Kennaway <kris@obsecurity.org>,
	sos@freebsd.org, sparc64@freebsd.org
References: <20031114105853.A92204@carver.gumbysoft.com>
	<20031114134001.D92204@carver.gumbysoft.com>
	<20031117130205.R22102@carver.gumbysoft.com>
	<20031117225453.GA35569@xor.obsecurity.org>
	<20031118011019.GA37617@xor.obsecurity.org>
	<20031120031150.GA759@timesink.dyndns.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20031120031150.GA759@timesink.dyndns.org>
User-Agent: Mutt/1.4.1i
Subject: Re: ultra5/cmd646 hang
X-BeenThere: freebsd-sparc64@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Porting FreeBSD to the Sparc <freebsd-sparc64.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-sparc64>,
	<mailto:freebsd-sparc64-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-sparc64>
List-Post: <mailto:freebsd-sparc64@freebsd.org>
List-Help: <mailto:freebsd-sparc64-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-sparc64>,
	<mailto:freebsd-sparc64-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 20 Nov 2003 03:20:53 -0000

On Thu, 2003/11/20 at 04:11:50 +0100, Thomas Moestl wrote:
> I think I've found the reason for this; the attached patch works around it.
> 
> The issue is that the chip does not set ATA_BMSTAT_INTERRUPT, even though
> it is DMA-capable. My hackaround is to add an interrupt handler for the
> CMD646 that does only check this bit if a DMA transfer is in progress,

I should add that this was observed on a rev. 3 CMD646 (aka CMD646U).

	- Thomas

-- 
Thomas Moestl <t.moestl@tu-bs.de>	http://www.tu-bs.de/~y0015675/
              <tmm@FreeBSD.org>		http://people.FreeBSD.org/~tmm/
PGP fingerprint: 1C97 A604 2BD0 E492 51D0  9C0F 1FE6 4F1D 419C 776C