Messages in this thread |  | | From | jbradford@dial ... | Subject | Re: Question about the dd command | Date | Wed, 18 Sep 2002 11:02:58 +0100 (BST) |
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Hi,
> I am trying to build a boot image in order to boot from a CD device. I have > already created all the parts ( Kernel, Lilo and Rootfs ) and try to bring > them together. I first copied it on a floppy in order to see wether I could > boot from it and it worked. In the Linux-Bootdisk-HOWTO It is said that on > should transfer the rootfs with the following command > > dd if=rootfs of=/dev/fd0 bs=1k seek=KERNEL_BLOCKS > > I calculated the KERNEL_BLOCK value in my case and applied the command. It > is supposed to transfer the rootfs file into the same floppy containing the > kernel. I am surprised to see that with a ls-command the rootfs.gz is invisible > on the floppy, though the boot process from floppy works properly. Later i > created an image of the floppy ( dd if=/dev/fd0 of=boot.img bs=10k count=144 > as in the Linux-Bootdisk-HOWTO ), created an iso file from it with mkisofs and > copied it on CD. Now I can't boot the image from this CD!
I'm assuming that you're trying to create a bootable CD for an X86 machine.
In that case, this is not how bootable CDs work. You need to look up the 'El-Torito' bootable CD specs, and take it from there.
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