From owner-freebsd-questions@FreeBSD.ORG Fri Jun 13 13:24:11 2008 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 794321065676 for ; Fri, 13 Jun 2008 13:24:11 +0000 (UTC) (envelope-from clarkjp@charter.net) Received: from mail.cluebytwelve.org (clueby12.org [198.186.190.239]) by mx1.freebsd.org (Postfix) with ESMTP id 490D98FC12 for ; Fri, 13 Jun 2008 13:24:05 +0000 (UTC) (envelope-from clarkjp@charter.net) Received: from localdomain.local (68-186-133-111.dhcp.jcsn.tn.charter.com [68.186.133.111]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.cluebytwelve.org (Postfix) with ESMTP id EA5681B5CA for ; Fri, 13 Jun 2008 08:23:53 -0500 (CDT) Received: by localdomain.local (Postfix, from userid 1001) id ABA23B883; Fri, 13 Jun 2008 08:23:52 -0500 (CDT) Date: Fri, 13 Jun 2008 08:23:52 -0500 From: "J. Porter Clark" To: freebsd-questions@freebsd.org Message-ID: <20080613132352.GA43591@auricle.charter.net> References: <20080612005453.GA26319@auricle.charter.net> <48513559.3000306@FreeBSD.org> <20080612153614.GA32605@auricle.charter.net> <485154D5.3060707@FreeBSD.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <485154D5.3060707@FreeBSD.org> Organization: http://www.angelfire.com/ego/porterclark/ User-Agent: mutt-ng/devel-r804 (FreeBSD) Subject: Re: Nanobsd on a CD-ROM X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Jun 2008 13:24:11 -0000 On Thu, Jun 12, 2008 at 06:54:45PM +0200, Pietro Cerutti wrote: > > > J. Porter Clark wrote: > | On Thu, Jun 12, 2008 at 04:40:25PM +0200, Pietro Cerutti wrote: > |> J. Porter Clark wrote: > |> | Is it possible to build a CD-ROM with a bootable NanoBSD on it? > |> | If so, how? > |> > |> Yes, Section 2.2 of > |> > |> http://www.freebsd.org/doc/en/articles/nanobsd/index.html > | > | Well, no, because I can't do this: > | > | # dd if=_.disk.full of=/dev/acd0 bs=64k > | > | If I do this: > | > | % cdrecord -v -immed driveropts=burnfree dev=1,0,0 -data _.disk.full > > Try with burncd > > | burncd -f /dev/acd0 data _.disk.full fixate No joy. Produces the same disk that cdrecord does, and boots from hard disk instead. I think that this is the problem: The BIOS knows how to boot from a CD if and only if that CD is an "El Torito" bootable image. That is, the first sector of the CD is NOT a Master Boot Record. That's just a hypothesis based on the observation that all of the successfully bootable CDs I have appear to be in "El Torito" format. I don't have a way to make such an image without using mkisofs. Figuring out how to pack the nanobsd image in such a way that mkisofs can make an "El Torito" bootable CD from it sounds difficult, offhand. Anybody know how to do this sort of thing? Is it even possible? -- J. Porter Clark