Date: Fri, 4 May 2001 11:48:50 -0400 From: Brian Dean <bsd@bsdhome.com> To: Rick Duvall <maillist@coastsight.com> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: Set up loader to boot cd Message-ID: <20010504114850.A18459@vger.bsdhome.com> In-Reply-To: <Pine.BSF.4.21.0104301128100.70711-100000@ns1.coastsight.com>; from maillist@coastsight.com on Mon, Apr 30, 2001 at 11:31:22AM -0700 References: <Pine.BSF.4.21.0104301128100.70711-100000@ns1.coastsight.com>
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On Mon, Apr 30, 2001 at 11:31:22AM -0700, Rick Duvall wrote:
> I am trying to make a custom boot CD for FreeBSD. I got it to the point
> to where the CD will boot, load the kernel, but that's as far as it
> get's. It does when it get's to the part where it wants to mount the root
> devicd. It tried to access the floppy drive.
>
> So, do I need to vnconfig the boot.flp and put my own custom loader in it
> or what? I don't want to be puting -C in every time I boot. Also, when I
> put in -C, the kernel will load, but then can't find the CD device....
>
> Any ideas would be appreciated. Maybe step by step instructions on making
> a custom bootable live cd would be nice.
I've had good success with the following which is a /bin/sh shell
function. Use it as follows:
% dofdboot /scratch/cdroot
where /scratch/cdroot could be produced by:
% make installkernel installworld DESTDIR=/scratch/cdroot
After all that, specify boot/boot.fd as your ISO eltorito boot image
file.
Enjoy!
-Brian
--
Brian Dean
bsd@FreeBSD.org
bsd@bsdhome.com
dofdboot () {
DESTDIR="$1"
echo "DOFDBOOT: DESTDIR=$DESTDIR"
echo "Generating 2.88 MB boot floppy image"
KERNELIMG=${DESTDIR}/kernel
umount /mnt > /dev/null 2>&1
vnconfig -u /dev/vn0 > /dev/null 2>&1
echo "Initialize boot floppy image"
dd if=/dev/zero of=${DESTDIR}/boot/boot.fd bs=1024 count=2880
vnconfig -s labels -c /dev/vn0 ${DESTDIR}/boot/boot.fd
disklabel -Brw /dev/vn0c minimum2
newfs -o space -T minimum2 /dev/vn0c
mount /dev/vn0c /mnt
echo "Copy kernel from ${KERNELIMG} to the boot floppy"
cp -p ${KERNELIMG} /mnt
mkdir /mnt/boot
echo "Copy boot1, boot2, and loader to boot floppy"
(cd ${DESTDIR}/boot && cp -p boot1 boot2 loader /mnt/boot)
echo "Create boot.config"
echo "-P" > /mnt/boot.config
echo "Create loader.rc"
cat <<EOF > /mnt/boot/loader.rc
echo "BSD CDROM ROOT IMAGE"
echo "LOADING KERNEL"
load /kernel
boot -C
EOF
umount /mnt
}
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