Creating Boot CDs
Change into a directory in which to create the ISO image, for example: cd /tmp
Create a subdirectory for GRUB:
mkdir -p iso/boot/grub
Copy the kernel, the files stage2_eltorito, initrd, menu.lst, and message to iso/boot/:
cp /boot/vmlinuz iso/boot/
cp /boot/initrd iso/boot/
cp /boot/message iso/boot/
cp /usr/lib/grub/stage2_eltorito iso/boot/grub
cp /boot/grub/menu.lst iso/boot/grub
Adjust the path entries in iso/boot/grub/menu.lst to make them point to a CD-ROM device. Do this by replacing the device name of the hard disks, listed in the format (hdx,y), in the pathnames with the device name of the CD-ROM drive, which is (cd). You may also need to adjust the paths to the kernel and the initrd—they need to point to /boot/vmlinuz and /boot/initrd, respectively. After having made the adjustments, menu.lst should look similar to the following example:
timeout 8
default 0
gfxmenu (cd)/boot/message
title Linux
root (cd)
kernel /boot/vmlinuz root=/dev/sda5 vga=794 resume=/dev/sda1 \
splash=verbose showopts
initrd /boot/initrd
Use splash=silent instead of splash=verbose to prevent the boot messages from appearing during the boot procedure.
Create the ISO image with the following command:
mkisofs -R -b iso/boot/grub/stage2_eltorito -no-emul-boot \
-boot-load-size 4 -boot-info-table -o grub.iso /tmp/iso
Write the resulting file grub.iso to a CD using your preferred utility. Do not burn the ISO image as data file, but use the option for burning a CD image in your burning utility.
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source:http://linuxpoison.blogspot.com/2008/08/13578175719655.html