On Wed, Nov 07, 2001 at 01:38:30AM +0800, csj wrote: > I want to burn grub, along with a kernel, onto a cdrom. My present > system has been to install grub to a floppy, make changes to that > floppy, and finally "dd" the floppy to a file, which I then set as the > boot image in cdrecord. Is there a way to install grub direct to a > floppy image file produced, say, by the following commands? > > dd if=/dev/hda of=grub_boot.fdd bs=1024 count=2880 > mke2fs grub_boot.fdd > > Is there a way for me to install grub directly to "grub_boot.fdd" and > have a file system on that file at the same time? Following the grub > doc, I have only been able to produce a 100K file which I can't loop > mount to make the changes I want: > > dd if=/boot/grub/stage1 of=grub_boot.test bs=512 count=1 > dd if=/boot/grub/stage2 of=grub_boot.test bs=512 seek=1 > > alpha:/foo/tmp$ ls -sh > total 3.0M > 2.9M grub_boot.fdd 100k grub_boot.test Try the following:
this recipe is heavily based on information provided to me by Petr Konecny. first make a 2.88MB zeroed image file. dd if=/dev/zero of=/tmp/boot288.img bs=512 count=5760 then set up the loop device. losetup /dev/loop0 /tmp/boot288.img then format it with the ext2 filesystem. mke2fs /dev/loop0 mount it under /mnt. mount /dev/loop0 /mnt create a directory named grub. mkdir /mnt/grub copy the grub stage files onto the floppy image. cp /usr/lib/grub/i386-pc/stage[12] /mnt/grub create a device map file. echo "(fd0) /dev/loop4" > /tmp/dev.map install grub to the image. /sbin/grub --device-map=/tmp/dev.map <<END root (fd0) setup (fd0) END -----<snip>------ # grub menu file menu.lst timeout 5 title Rescue System root (fd0) kernel /vmlinuz root=/dev/ram0 ramdisk_size=4096 init=/linuxrc rw -----<snap>------ now copy the initrdfs.gz and the kernel to /mnt and unmount /mnt. finally detach the loop device: losetup -d /dev/loop0 voila, that's it. HTH -timo -- gpg key fingerprint = 6832 C8EC D823 4059 0CD1 6FBF 9383 7DBD 109E 98DC
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