From owner-freebsd-stable@FreeBSD.ORG  Mon Apr 28 08:06:50 2003
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
Delivered-To: freebsd-stable@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 0B19337B401
	for <freebsd-stable@freebsd.org>;
	Mon, 28 Apr 2003 08:06:50 -0700 (PDT)
Received: from smtp0.adl1.internode.on.net (smtp0.adl1.internode.on.net
	[203.16.214.194])
	by mx1.FreeBSD.org (Postfix) with ESMTP id E0FF943FBF
	for <freebsd-stable@freebsd.org>;
	Mon, 28 Apr 2003 08:06:48 -0700 (PDT)
	(envelope-from smckay@internode.on.net)
Received: from dungeon.home (ppp343.qld.padsl.internode.on.net
	[150.101.177.86])h3SF6ksu077988;
	Tue, 29 Apr 2003 00:36:46 +0930 (CST)
Received: from dungeon.home (localhost [127.0.0.1])
	by dungeon.home (8.12.8p1/8.11.6) with ESMTP id h3SF6jWq008776;
	Tue, 29 Apr 2003 01:06:46 +1000 (EST)
	(envelope-from mckay)
Message-Id: <200304281506.h3SF6jWq008776@dungeon.home>
To: freebsd-stable@freebsd.org
Date: Tue, 29 Apr 2003 01:06:45 +1000
From: Stephen McKay <smckay@internode.on.net>
cc: Stephen McKay <smckay@internode.on.net>
Subject: ATA driver not as good in 4.8 as 4.5?
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Production branch of FreeBSD source code
	<freebsd-stable.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
	<mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable>
List-Post: <mailto:freebsd-stable@freebsd.org>
List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
	<mailto:freebsd-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 28 Apr 2003 15:06:50 -0000

I have a Lite-On 24102B burner on an Epox 7KXA (VIA 686A southbridge) 
together with a few SCSI disks.  I recently upgraded from FreeBSD 4.5
to 4.7 then almost immediately to 4.8.  I've had trouble with the burner
since.

With FreeBSD 4.5, I used "sysctl hw.atamodes=---,---,dma,---" to set
the burner to DMA.  Everything then worked fine.  As far as I know it
was using UDMA33.  That's what the BIOS said it was using anyway.

With FreeBSD 4.8 I use "hw.ata.atapi_dma=1" at boot.  This then tells
me it is using UDMA33.  Unfortunately, I then often get this:

    acd0: READ_BIG - HARDWARE ERROR asc=0x08 ascq=0x03 error=0x00

I think this means a DMA error.  (PS why not say what it is?)

If I use atacontrol to downgrade to WDMA2, it works flawlessly (though
somewhat slower than it does in UDMA33 mode).

So, was 4.5 setting my hardware to WDMA2 when I thought it was doing UDMA33?
Has 4.8 introduced bugs that weren't in 4.5?  Is there another setting I've
missed?

Cheers,

Stephen.