From owner-freebsd-arch@FreeBSD.ORG  Sun Aug  9 11:25:55 2009
Return-Path: <owner-freebsd-arch@FreeBSD.ORG>
Delivered-To: freebsd-arch@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id B899B106566B;
	Sun,  9 Aug 2009 11:25:55 +0000 (UTC)
	(envelope-from nyan@jp.FreeBSD.org)
Received: from sakura.ccs.furiru.org (sakura.ccs.furiru.org
	[IPv6:2001:2f0:104:8060::1])
	by mx1.freebsd.org (Postfix) with ESMTP id 657028FC15;
	Sun,  9 Aug 2009 11:25:55 +0000 (UTC)
Received: from localhost (authenticated bits=0)
	by sakura.ccs.furiru.org (unknown) with ESMTP id n79BPosG010117;
	Sun, 9 Aug 2009 20:25:53 +0900 (JST)
	(envelope-from nyan@jp.FreeBSD.org)
Date: Sun, 09 Aug 2009 20:25:49 +0900 (JST)
Message-Id: <20090809.202549.27838630.nyan@jp.FreeBSD.org>
To: mav@freebsd.org
From: Takahashi Yoshihiro <nyan@jp.FreeBSD.org>
In-Reply-To: <4A7DF076.4070203@FreeBSD.org>
References: <4A7DF076.4070203@FreeBSD.org>
X-Mailer: Mew version 6.2 on Emacs 22.3 / Mule 5.0 (SAKAKI)
Mime-Version: 1.0
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Cc: freebsd-arch@freebsd.org, freebsd-hardware@freebsd.org
Subject: Re: Do we still need ATA disk CHS addressing?
X-BeenThere: freebsd-arch@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussion related to FreeBSD architecture <freebsd-arch.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arch>,
	<mailto:freebsd-arch-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-arch>
List-Post: <mailto:freebsd-arch@freebsd.org>
List-Help: <mailto:freebsd-arch-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arch>,
	<mailto:freebsd-arch-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 09 Aug 2009 11:25:56 -0000

In article <4A7DF076.4070203@FreeBSD.org>
Alexander Motin <mav@freebsd.org> writes:

> While preparing wrapping ATA(4) low-level drivers code into CAM SIM, I
> would like to remove CHS addressing support to make code cleaner. CHS
> addressing is officially declared obsoleted and replaced by LBA. Since
> ATA/ATAPI-6 specification (October 2001) it is even no longer
> documented.
> 
> Have anybody seen ATA drive without LBA support in last years?
> Any other objections against removing it?

PC98 uses CHS addressing because the internal interface works for very
old HDD only, so I hope it remains if possible.  But if you need a lot
of works for CHS support, I agree to remove it.

---
TAKAHASHI Yoshihiro <nyan@jp.FreeBSD.org>