Date: Tue, 11 Aug 2009 19:55:59 +0900 (JST) From: Takahashi Yoshihiro <nyan@jp.FreeBSD.org> To: imp@bsdimp.com Cc: mav@FreeBSD.org, freebsd-hardware@FreeBSD.org, freebsd-arch@FreeBSD.org Subject: Re: Do we still need ATA disk CHS addressing? Message-ID: <20090811.195559.61406403.nyan@jp.FreeBSD.org> 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>
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In article <20090810.162424.846948847.imp@bsdimp.com> "M. Warner Losh" <imp@bsdimp.com> 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 <nyan@jp.FreeBSD.org>
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