From owner-svn-src-all@freebsd.org Tue Mar 28 06:19:23 2017 Return-Path: Delivered-To: svn-src-all@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id E6FC5D21A82; Tue, 28 Mar 2017 06:19:23 +0000 (UTC) (envelope-from julian@vps1.elischer.org) Received: from vps1.elischer.org (vps1.elischer.org [204.109.63.16]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "vps1.elischer.org", Issuer "CA Cert Signing Authority" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id C2C54784; Tue, 28 Mar 2017 06:19:23 +0000 (UTC) (envelope-from julian@vps1.elischer.org) Received: from vps1.elischer.org (localhost [127.0.0.1]) by vps1.elischer.org (8.15.2/8.15.2) with ESMTPS id v2S6JEp0073751 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Mon, 27 Mar 2017 23:19:16 -0700 (PDT) (envelope-from julian@vps1.elischer.org) Received: from localhost (julian@localhost) by vps1.elischer.org (8.15.2/8.15.2/Submit) with ESMTP id v2S6JEIB073748; Mon, 27 Mar 2017 23:19:14 -0700 (PDT) (envelope-from julian@vps1.elischer.org) Date: Mon, 27 Mar 2017 23:19:14 -0700 (PDT) From: Julian Elischer To: Bruce Evans cc: Warner Losh , src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r316064 - head/sys/boot/i386/boot2 In-Reply-To: <20170328141213.T927@besplex.bde.org> Message-ID: References: <201703272253.v2RMra2L032487@repo.freebsd.org> <20170328141213.T927@besplex.bde.org> User-Agent: Alpine 2.20 (BSF 67 2015-01-07) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 28 Mar 2017 06:19:24 -0000 On Tue, 28 Mar 2017, Bruce Evans wrote: [...] > they have to fit below 640K and a few multiples of 64K are already > used for buffers). The limit on 8K is mainly a historical mistake. > A limit of 7.5K simplified booting from 15-sector floppies. 18-sector My memory says that the limit of 7.5K is becuase there was only 8k left free at the front of UFS1 and one sector was used for the boot0 code. > floppies allowed easy expansion to 9K, but were unportable for a small > gain. The default partition layout left only 8K below the ffs > superblock, but was only a default. > > Bruce > >