accessing CD fs from initrd

accessing CD fs from initrd

[zvi Dubitzki]

Hi there

I want to be CC-ed on a possible answer to the following question.
I have not found yet an answer to the question in the Linux archives.

In need access the CD filesystem (iso9660) from within the Linux initrd or 
right after that (make it root fs).
I need an example for that since allocating enough ramdisk space 
(ramdisk_size=90k in kernel command line)  + loading the cdrom.o
module at the initrd did not help  mount the CD device (/dev/cdrom)  at the 
initrd
Also I need know how to pivot between the initrd and the CD filesystem

I am actually using Isolinux/syslinux, but can make test on a regular Linux 
.
Any pointer to a literature will also be welcomed .

thanks

Zvi Dubitzki

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Re: accessing CD fs from initrd

[Glennie Vignarajah]

Le Monday 25 July 2005 09:27, zvi Dubitzki("zvi Dubitzki" 
<zvidubitzki@hotmail.com>) disait:

Hello,

> In need access the CD filesystem (iso9660) from within the Linux
> initrd or right after that (make it root fs).
> I need an example for that since allocating enough ramdisk space
> (ramdisk_size=90k in kernel command line)  + loading the cdrom.o
> module at the initrd did not help  mount the CD device
> (/dev/cdrom)  at the initrd
> Also I need know how to pivot between the initrd and the CD
> filesystem

'MkCDrec' makes a bootable CDs. Have look at it. It uses shells 
scripts only. So, it's easy to understand. If you want, I can mail 
you the initrd made by those scripts!

 If you're using Debian, have a look at bootcd-mkinitrd package !

 I suppose any live CDs  based distributions (like knopix) do such 
things too....


 By the way, this is not the correct ML for these questions. Please 
use a list based on your GNU/Linux distribution !

-- 
Glennie
"Personne ne survit au fait d'être estimé au-dessus de sa valeur." 

Re: accessing CD fs from initrd

[Jan Engelhardt]

> I suppose any live CDs  based distributions (like knopix) do such 
>things too....

Only using (syslinux), mkisofs and mksquashfs here.


Jan Engelhardt
-- 

RE: accessing CD fs from initrd

[Roger Heflin]

/dev/cdrom is a link to the proper device, if that link is not
on the initrd /dev/cdrom won't work.

I previously had some statically linked linuxrc C code (I don't
have the code anymore- it was a work-for-hire), that scanned
the various locations that the cd could be (/dev/hd[abcd...])
and looked for specific files that it expected to be on the
cd, once it found it it setup real-root-dev to be proper for
that device.

This work rather nicely in situations where the location of
the cd drive was not the same from one machine to another,
and was rather simple to write.

                        Roger 

> -----Original Message-----
> From: linux-kernel-owner@vger.kernel.org 
> [mailto:linux-kernel-owner@vger.kernel.org] On Behalf Of zvi Dubitzki
> Sent: Monday, July 25, 2005 2:28 AM
> To: linux-kernel@vger.kernel.org
> Subject: accessing CD fs from initrd
> 
> Hi there
> 
> I want to be CC-ed on a possible answer to the following question.
> I have not found yet an answer to the question in the Linux archives.
> 
> In need access the CD filesystem (iso9660) from within the 
> Linux initrd or right after that (make it root fs).
> I need an example for that since allocating enough ramdisk 
> space (ramdisk_size=90k in kernel command line)  + loading 
> the cdrom.o module at the initrd did not help  mount the CD 
> device (/dev/cdrom)  at the initrd Also I need know how to 
> pivot between the initrd and the CD filesystem
> 
> I am actually using Isolinux/syslinux, but can make test on a 
> regular Linux .
> Any pointer to a literature will also be welcomed .
> 
> thanks
> 
> Zvi Dubitzki
> 
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