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javacrypto
n00b
Joined: 22 Oct 2002
Posts: 16
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 Posted: Wed Aug 27, 2003 5:22 am Post subject: Recomple kernel with new options w/o ruining everything |
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Hi
When I was installing Gentoo, I had some hardware problems, and while I was trying to troubleshoot them, I set the kernel CPU option to 486 instead of AMD K6-2. Well, I fixed the hardware problem, but now I am running a 486 kernel on a K6-2, which is probably slowing it down.
I want to recompile the kernel for the AMD, but I don't want to lose what I already have, because it runs, and I don't want to break it. The reason I am cautious is that last time I tried this, the "make clean" step deleted all my drivers and the sound stopped working, and then the compile failed and I never got it working again. That was a year or so ago, and right after that happened, I dumped Gentoo for some other distro. But now I'm back, and I want to do it right.
It looks like I should copy:
/usr/src/linux-2.4.20-gentoo-rc5
to:
/usr/src/linux-2.4.20-gentoo-rc5-AMDK6
Then I should change the /usr/src/linux symlink to point to the new directory. After that, I should be able to run genkernel --config and do some experimenting.
So, would that work?
Thanks.
Chris |
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rommel
Veteran
Joined: 19 Apr 2002
Posts: 1145
Location: Williamsburg Virginia
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| Posted: Wed Aug 27, 2003 5:46 am Post subject: |
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well first off ... get over it... kernel compilation is something you should get real familiar with.
| Code: | | #cd /usr/src/linux #cp .config ../ #make mrproper #cp ../.config ../linux #make menuconfig |
change your processor and then | Code: | | #make dep && make clean bzImage modules modules_install |
after the kernel has compiled | Code: | | #mount /boot #mv /boot/bzImage /boot/bzImage.old #cp arch/i386/boot/bzImage /boot |
emerge anything like alsa or nvidia-kernel now that needs to build against the kernel adn install to /lib/modules/2.x.x-whateveryourun |
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UncleTom
Apprentice
Joined: 20 Aug 2003
Posts: 194
Location: Bern, Switzerland
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| Posted: Wed Aug 27, 2003 2:45 pm Post subject: |
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You don't need to copy /usr/src/linux-2.4.20-gentoo-rc5, just do a
| Code: |
cd /usr/src/linux
make menuconfig
make dep && make clean bzImage modules modules_install
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I haven't used genkernel, so I can't help you with that, sorry.
rommel suggested to copy your current .config file for safety and I agree with that. Personally, I keep a copy of the .config file together with the bzImage in /boot. I also give these files a name and a number, so I usually have something like bzImage-gentoo-2.4.20#1 together with a config-gentoo-2.4.20#1, then come ...#2, ...#3 and so on.
In your case, #1 would be your 486 kernel and #2 the new AMD kernel.
That way, I can always go back to a previous kernel if I do something really stupid and the kernel won't boot. grub makes this especially easy.
_________________
bug, n: A son of a glitch. |
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javacrypto
n00b
Joined: 22 Oct 2002
Posts: 16
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| Posted: Thu Aug 28, 2003 5:56 am Post subject: |
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I poked around long enough and found what I was looking for.
Apparently, the Makefile has a line called EXTRAVERSION. Right now, this line says:
I could change this to something like:
and compile as normally, and it should make a whole new tree in /lib/modules, so my current drivers don't get lost when the new kernal compiles.
I'll try this out.
Chris |
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javacrypto
n00b
Joined: 22 Oct 2002
Posts: 16
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| Posted: Fri Aug 29, 2003 1:34 pm Post subject: |
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I took a close look at the genkernel script and found that it places its compiled files into the folder where the /usr/src/linux link is located, and it would also put the modules in /lib/modules/KERNEL-VERSION.
To stop genkernel from messing with the current installation, I renamed the directory from:
/usr/src/linux-2.4.20-gentoo-r5
to:
/usr/src/linux-2.4.20-gentoo-r5-AMD
Then I fixed the /usr/src/linux link to point to the newly-renamed location. I also changed the line in the Makefile to read:
EXTRAVERSION="gentoo-r5-AMD"
Then I used genkernel as normal. Everything worked fine. The old modules were left alone in case something went horribly wrong. New modules were created. I changed the grub menu to point to the new kernel and rebooted, and it worked with no problems.
As a bonus, the NVidia drivers started working!
Thanks for the help.
Chris |
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javacrypto
n00b
Joined: 22 Oct 2002
Posts: 16
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| Posted: Fri Aug 29, 2003 1:34 pm Post subject: |
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I took a close look at the genkernel script and found that it places its compiled files into the folder where the /usr/src/linux link is located, and it would also put the modules in /lib/modules/KERNEL-VERSION.
To stop genkernel from messing with the current installation, I renamed the directory from:
/usr/src/linux-2.4.20-gentoo-r5
to:
/usr/src/linux-2.4.20-gentoo-r5-AMD
Then I fixed the /usr/src/linux link to point to the newly-renamed location. I also changed the line in the Makefile to read:
EXTRAVERSION="gentoo-r5-AMD"
Then I used genkernel as normal. Everything worked fine. The old modules were left alone in case something went horribly wrong. New modules were created. I changed the grub menu to point to the new kernel and rebooted, and it worked with no problems.
As a bonus, the NVidia drivers started working!
Thanks for the help.
Chris |
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javacrypto
n00b
Joined: 22 Oct 2002
Posts: 16
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| Posted: Fri Aug 29, 2003 1:36 pm Post subject: |
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I took a close look at the genkernel script and found that it places its compiled files into the folder where the /usr/src/linux link is located, and it would also put the modules in /lib/modules/KERNEL-VERSION.
To stop genkernel from messing with the current installation, I renamed the directory from:
/usr/src/linux-2.4.20-gentoo-r5
to:
/usr/src/linux-2.4.20-gentoo-r5-AMD
Then I fixed the /usr/src/linux link to point to the newly-renamed location. I also changed the line in the Makefile to read:
EXTRAVERSION="gentoo-r5-AMD"
Then I used genkernel as normal. Everything worked fine. The old modules were left alone in case something went horribly wrong. New modules were created. I changed the grub menu to point to the new kernel and rebooted, and it worked with no problems.
As a bonus, the NVidia drivers started working!
Thanks for the help.
Chris |
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