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Old 01-05-2007, 12:38 AM   #1
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Registered: Oct 2003
Location: INDIA-PUNE
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customize initrd to boot it from network

Im trying to create a customized initrd image for
either recovery or installing OS on bare-metal

I want to customize initrd so that I can run my
application once vmlinuz loads initrd. (similar to dos
booting - dos runs autoexec.bat)

I followed following steps, but could not succeede:-

- downloaded & built linux 2.4 kernel source code.
- Built initrd using mkinitrd.

Now I want to customize initrd - so that i can modify
linuxrc script inside it to run my custom application
once initrd gets loaded.

To modify initrd - i tried mounting initrd image
at /mnt/initrd folder,
but received error

[root@rhel40-junk pt]# mount initrd /mnt/initrd -t
ext2 -o
mount: wrong fs type, bad option, bad superblock on
or too many mounted file systems
(could this be the IDE device where you in fact
ide-scsi so that sr0 or sda or so is needed?)

I also tried network booting machine with built
bzImage & initrd, but
receives error:

Kernel panic: VFS: Unable to mount root fs on 08:01

- Then I searched for ready to download initrd
recovery images on net:-

when i try to mount the initrd image downloaded from
It does not give me errors.

Please advice.

Old 01-05-2007, 12:43 AM   #2
Senior Member
Registered: Jan 2006
Location: Charleston, SC, USA
Distribution: Debian, Gentoo, Ubuntu, RHEL
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I think mkinitrd no longer creates a compressed ext2, I think it's a cpio archive now.
Old 01-05-2007, 12:44 AM   #3
Registered: Nov 2004
Location: Novi Sad, Serbia
Distribution: Debian, Slackware, Gentoo, openSuSE
Posts: 254

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[root@rhel40-junk pt]# mount initrd /mnt/initrd -t ext2 -o loop=/dev/loop0
mount: wrong fs type, bad option, bad superblock on /dev/loop0
Check that initrd is not compressed (file initrd). I just tried, and this mounted my old 2.4 initrd:

mount /boot/initrd-2.4 /mnt/hd -o loop


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