Kernel compilation question

zatalian · Posted: Wed Sep 18, 2002 8:03 am Post subject:

Hi,

Comming from redhat, i'm new to compiling kernels, and recompiling them... So I have a question :

I just downloaded the latest gentoo kernel but I want to keep the old one until i'm sure the new one is working fine. I noticed the bzImage copies in /boot but what about the /usr/src/linux link and what about the modules?

How do i get the right modules with the right kernel at startup and the right link to the kernel source?

rac · Posted: Wed Sep 18, 2002 8:10 am Post subject:

This question originally appeared here. Please don't post support questions to threads in Documentation, Tips & Tricks.
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zatalian · Posted: Thu Sep 19, 2002 7:37 am Post subject:

while looking into the kernel topics i found that the modules are stored in a /lib/modules/<kernel version> directory. So that solves -almost- one problem.

I guess if I want 2 versions of the same kernel, i'll have to use the same dir or change the kernel version.

But i still have problems with older versions. Last night i re-emerged my nvidia-kernel for my latest kernel and now my previous kernel does not find it anymore.

Second thing i noticed is that at startup, something (Insmod?) was complaining about a newer version of /etc/modules.conf

Thirth thing is the symlink...

And then there's one more thing, maybe a little bit of topic, but i was wondering if somebody has a solution for this one :
when i compile my kernel, it doesn't use the compiler settings as i defined them in make.conf. Any idea's on how to force my compiler options into the kernel building process?

rac · Posted: Thu Sep 19, 2002 8:22 am Post subject:

RedBeard0531 · Guru Joined: 21 Sep 2002 Posts: 415 Location: maryland

I think he means the /usr/src/linux symlink

to update it:

cd /usr/src
rm linux
ln -s linux-2.4.19-gentoo-r9 linux

this asumes u r using r9, and if u emerge sync'ed this moth you prolly are
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zatalian · Posted: Sun Sep 22, 2002 10:17 am Post subject:

I know how to update a kernel and everything that is related to it.
I was just wondering if it is possible to keep 2 kernels on the same machine and do all the stuff automatically. Right now, I have 2 kernels, r7 and r9. Grub can boot from both, but the related stuf like the /usr/src/linux link, the nvidia module, ... must be done every time i change from kernel.
So i was wondering if there is somebody out there who has 2 or more kernels, and has automated the hole process of changing kernels at startup.