RE: /dev/null not a device in Linux boot image / initrd

When you extract the initrd, the devices within it are not extracted, for obvious reasons.

When you repack it, you can add the devices back as follows:

mknod-cpio.pl < devices.txt > devices.cpio

cat devices.cpio >> initrd

Hope that helps.

Steven

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From: Johannes Singer [mailto:[email protected]]
Sent: 09 February 2010 12:24
To: Juan Jose Pablos
Cc: [email protected]
Subject: Re: /dev/null not a device in Linux boot image / initrd


Juan,



Sorry, it seems that it was my fault.

I retested the whole thing, and it seems I was creating the initrd wrong. /dev/null works

with the initrd from the downloadable zip.



Apparently extracting the initrd, changing files and repacking it with

"find . | cpio -o -H newc > /unattended/linuxboot/tftpboot/initrd"

does not work completely. I used the "five steps" instructions from the

wiki here: http://sourceforge.net/apps/trac/unattended/wiki/ModifyingTheBootDisk



Unfortunately the drivers are not copied with the stock initrd from the zip file, I will

investigate further.



I am sorry to have bothered you.



I would like to make good for this by submitting installer scripts. :-)

What is the usual procedure for this?



Sincerely,

        Johannes

Juan Jose Pablos schrieb:

Steven Blackery escribió:



Inside devices.txt is:



dev/null c 1 3



which, if you are using mknod-cpio.pl with devices.txt as the input to append the devices to your initrd, should work...







Steven,

that is exactly how is done it when building the iso image (I did not know):





## devices

devices.cpio: misc/devices.txt

         tools/mknod-cpio.pl < $< >| [email protected]

         mv [email protected] $@



....



initrd: devices.cpio .stamp-stage2

         (cd stage2 && find . | cpio -H newc -o) >| [email protected]

         cat devices.cpio >> [email protected]

         mv [email protected] $@



now,

I have try both the iso image and the network image, and both have



ls -l /dev/null



crw------- 1 root 0 1,   3 Jan 18 17:19 /dev/null



Johannes,

are you building up the images from source?





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