From owner-freebsd-hardware@FreeBSD.ORG Tue Aug 11 10:56:11 2009 Return-Path: Delivered-To: freebsd-hardware@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id DE274106564A; Tue, 11 Aug 2009 10:56:11 +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 5021F8FC20; Tue, 11 Aug 2009 10:56:11 +0000 (UTC) Received: from localhost (authenticated bits=0) by sakura.ccs.furiru.org (unknown) with ESMTP id n7BAtxmr022632; Tue, 11 Aug 2009 19:56:02 +0900 (JST) (envelope-from nyan@jp.FreeBSD.org) Date: Tue, 11 Aug 2009 19:55:59 +0900 (JST) Message-Id: <20090811.195559.61406403.nyan@jp.FreeBSD.org> To: imp@bsdimp.com From: Takahashi Yoshihiro In-Reply-To: <20090810.162424.846948847.imp@bsdimp.com> References: <20090810.125403.74653324.imp@bsdimp.com> <4A807BDD.6040709@FreeBSD.org> <20090810.162424.846948847.imp@bsdimp.com> 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: mav@FreeBSD.org, freebsd-hardware@FreeBSD.org, freebsd-arch@FreeBSD.org Subject: Re: Do we still need ATA disk CHS addressing? X-BeenThere: freebsd-hardware@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: General discussion of FreeBSD hardware List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 11 Aug 2009 10:56:12 -0000 In article <20090810.162424.846948847.imp@bsdimp.com> "M. Warner Losh" writes: > There's also some oddities at the lowest levels for pc98 controllers, > but I don't think this change would affect that. However, like I > said, ask the pc98 guys for sure. > > I've cc'd nyan@, since he can answer the question: "What breaks in > pc98 if we lose support for CHS-based disk I/O?" The following document in Japanese says: "PC-98 usually use CHS addressing. PC-98 does not use LBA addressing." http://www.webtech.co.jp/company/doc/undocumented_mem/io_ide.txt But I could use 400MB HDD with LBA addressing on my pc98, so it seems that my pc98 supports LBA addressing at least. I don't know older pc98 supports it or not. --- TAKAHASHI Yoshihiro