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Old 07-26-2004, 04:35 AM   #1
thorax
Member
 
Registered: Jun 2004
Location: Germany
Posts: 73

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Managing different kernels on one system


Hi!
I was using Fedora Core 2 some weeks ago, and played around with various kernel
versions and -configurations.
After some time then, I finally broke my system so that it didn't boot up with
any of the custom compiled kernels.
I then felt that it was time to change to Mandrake 10, mostly because of the
working ATI graphics drivers.
Mandrake 10 came with an rather old kernel, 2.6.3, in fact, so I soon compiled
my own 2.6.7 kernel with the enwset 2.6.7 patch by Con Kolivas. It's working
well now, but what should I do if the new 2.6.8 kernel is finalized and I want
to install it? How do I keep all those kernel versions and the corresponding
modules isolated from each other? What do you recommend?

thx in advance!
 
Old 07-26-2004, 05:01 AM   #2
chardome
LQ Newbie
 
Registered: Mar 2003
Distribution: slackware-current
Posts: 15

Rep: Reputation: 0
Hi,

After you compile a new kernel, you have to copy arch/... to /boot/vmlinuz...
The new /boot/vmlinuz... is just a name, different for each kernel you compile.
It could be /boot/vmlinuz-2.4.26 or /boot/vmlinuz-2.6.7 or /boot/vmlinuz-new, /boot/vmlinuz-new1, it doesn' t matter, it is just a name.
Just make another entry in LILO, with the new name you gave for each kernel.
image=/boot/vmlinuz
root=/dev/hda1
label=slackware1
read-only
This one of my entries. The next one is:

image=/boot/vmlinuz-2.6.7
root=/dev/hda1
label=slackware
read-only

Give aswell a timeout, and a default entry to be booted
.
When modifying LILO, don' t forget rerun lilo /sbin/lilo to update LILO at the next boot.
Same way for GRUB, even I am not really familiar yet.

Hope this is an help
 
Old 07-26-2004, 05:35 AM   #3
thorax
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Registered: Jun 2004
Location: Germany
Posts: 73

Original Poster
Rep: Reputation: 15
Hi,
managing the already compiled kernels was not my problem, but managing the sources and keeping them isolated from each other. I have some modules that didn't came with the kernel, but needed the kernel sources to compile cleanly. So, when I compile an new kernel, how can I make sure that the version of the module corresponding to the old kernel is not loaded, but the new version?
 
Old 07-26-2004, 02:10 PM   #4
thorax
Member
 
Registered: Jun 2004
Location: Germany
Posts: 73

Original Poster
Rep: Reputation: 15
Aargh, 10 minutes ago a typical problem happened again, and I have no plan how to fix it!

I compiled the 2.6.8-rc2 kernel, no problems. It is present in /usr/src/linux-2.6.8-rc2, but there's no symlink /usr/src/linux refering to it; there is my 2.6.7-ck5 kernel.
So, everytime the kernel tries to boot, I get a kernel panic: VFS: Unable to mount root fs on unknown-block(3,9)
I gave the kernel the command line option root=/dev/hda9, but it didn't help!
Can someone help me? The 2.6.7 kernel worked correctly, and I don't think that it's a bug in the kernel
 
  


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