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SubjectRe: Merging EXT2 and El Torito
Date
Followup to:  <6dvb0l$out@pccross.average.org>
By author: crosser@average.org (Eugene Crosser)
In newsgroup: linux.dev.kernel
>
> I agree with hpa that if you want your CD as a root you can live with
> iso9660 fs and El Torito boot floppy image. But, it would be much better
> for many purposes to have root filesystem on a ramdisk, like we do on
> most Linux distributions, and cdrom itself mounted as /usr or something.
> Having root on ramdisk is more flexible: you can edit config files like
> /etc/hosts, easily create mount points if necessary etc.
>
> Now, my question is: is it possible to tell the kernel to load ramdisk
> image from cdrom, and if yes, how? At the first glance, seems to be
> tricky. In case of floppy, the image is read straight from device,
> and in case of cdrom, you need to access a file on a filesystem that
> is not mounted yet.
>
> Any ideas, anyone?
>

Piece of cake. Use initrd:

Create a floppy image with your kernel and a .gz file of your root
filesystem. Put SYSLINUX 1.33 or later on it as a boot loader. Use
that as your El Torito boot disk image. Done.

This works, because an initrd is loaded by the boot loader and not by
the kernel.

-hpa
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