From: jbradford@dial.pipex.com
To: tcheer@gmx.de (Eric Tchepannou)
Cc: linux-kernel@vger.kernel.org
Subject: Re: Question about the dd command
Date: Wed, 18 Sep 2002 11:02:58 +0100 (BST) [thread overview]
Message-ID: <200209181002.g8IA2w52001416@darkstar.example.net> (raw)
In-Reply-To: <18955.1032342092@www26.gmx.net> from "Eric Tchepannou" at Sep 18, 2002 11:41:32 AM
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.
John.
next prev parent reply other threads:[~2002-09-18 9:50 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-18 9:41 Question about the dd command Eric Tchepannou
2002-09-18 10:02 ` jbradford [this message]
2002-09-18 23:48 ` Bourne
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