Ubuntu Customization Kit

Replace kernel

Asked by helander

I would like to create a Live CD (or preferably USB stick) that would be based on Hardy (or Feisty if it does not work with Hardy?). The key issue for me is that I need to use a real-time kernel in order to get the most out of the jack based applications. Is it possible to use uck to replace the "generic" kernel with the corresponding "rt" (real-time) kernel? If so, what are the necessary steps?

Kind Regards

/Lars

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Krzysztof Lichota (krzysiek-launchpad-ubuntu-com) said : 		#1

Yes, you should be able to replace kernel just like it happens if you upgrade kernel. Just install new kernel (using Adept/Synaptic or console) and remove old kernel. UCK should automatically pick up latest vmlinuz and initrd.

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Dawid Piotrowski (crazyelk-o2) said : 		#2

I'm trying to do the same thing. After running uck, in chroot evrinoment I was downloaded 2.3.23 kernel from kernel.org, after that I patched it with RTAI patch and squashfs patch, compile and install (https://www.rtai.org/RTAILAB/RTAI-UbuntuGutsy-Matlab.txt). Unfortunetly it doesn't work, Live! CD is hanging up and throwing me into very poor ash shell. When I made the same steps in normal installed system all was O.K.

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Krzysztof Lichota (krzysiek-launchpad-ubuntu-com) said : 		#3

Please attach exact messages with errors.

Have you generated initramfs using mkinitramfs? Does this kernel work in installed system?

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Dawid Piotrowski (crazyelk-o2) said : 		#4

My customized Live! CD hangs up right hiere:

[code]

[ 46.802823] Uniform CD-ROM driver Revision: 3.20
[ 46.860451] sr 1:0:0:0: Attached scsi generic sg0 type 5
[ 48.019932] loop: module loaded

BusyBox v1.1.3 (Debian 1:1.1.3-5ubuntu7) Built-in shell (ash)
Enter 'help' for a list of built-in commands.

(initramfs) uname -r
2.6.23-rtai36-core2 //# it seems to be OK

(initramfs) return
cp: unable to open '/root/var/log/' : No such file or directory
Done.
Begin: Running /scripts/init-bottom ...
mount: Mounting /root/dev on /dev/.static/dev failed: No such file or directory
Done.
mount: Mounting /sys on /root/sys failed: No such file or directory
mount: Mounting /proc on /root/proc failed: No such file or directory
Target filesystem doesn't have /sbin/init

BusyBox v1.1.3 (Debian 1:1.1.3-5ubuntu7) Built-in shell (ash)
Enter 'help' for a list of built-in commands.

(initramfs)

[/code]

Yes, this kernel works fine in installed system.
I'm not sure if I have generated initramfs using mkinitramfs, my build.log is missing :/
I will try to do it again in next week.

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Krzysztof Lichota (krzysiek-launchpad-ubuntu-com) said : 		#5

Please make sure that you have regenerated initramfs and try again.

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michele (michele-plantamura) said : 		#6

Hi there! I also have the same problem: I uninstalled the kernel, then with dpkg -i I installed ider and image. What do I still need to do after? Could you kindly list all the following steps...thanks so much!

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