Date: Fri, 13 Jun 2008 14:51:18 +0100 From: Vince Hoffman <jhary@unsane.co.uk> To: "J. Porter Clark" <jpc@porterclark.com> Cc: freebsd-questions@freebsd.org Subject: Re: Nanobsd on a CD-ROM Message-ID: <48527B56.2050701@unsane.co.uk> In-Reply-To: <20080613132352.GA43591@auricle.charter.net> References: <20080612005453.GA26319@auricle.charter.net> <48513559.3000306@FreeBSD.org> <20080612153614.GA32605@auricle.charter.net> <485154D5.3060707@FreeBSD.org> <20080613132352.GA43591@auricle.charter.net>
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to make a freebsd CDROM bootable you need to use the /boot/cdboot as the loader and make an ISO image. the nanobsd procedure creates a ufs disk image from what I understand. Try mounting the disk image mdconfig -a -t vnode -u 11 -f /path/to/image/_.disk.full mkdir /mnt/image mount /dev/md11 /mnt/image (might be /dev/md11s1a or similar, see whats created and find what works.) Then make an ISO of the mounted nanobsd image mkisofs -J -R -no-emul-boot -b /boot/cdboot \ -iso-level 3 -o nanobsd.iso /mnt/image Then either burn it to CD or install qemu to see if it boots before making another coaster. I havent tried this exactly but this should work, may need polishing though. Vince J. Porter Clark wrote: > 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? >
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