Installing Custom Kernel

You can get away in most of the cases just by installing the kernel headers, but if you need to modify kernel parameters, then you'll have to install a custom kernel.

To install the kernel headers, first you need to find out what kernel you are using. To find that out do the following:

#uname -r

In my case, when I perform that command I get: 2.6.22-1-41.fc7

Now depending on which system you're running, you'll have to append .x86_64 or .i686 or whichever system you're using to the end of that number.

As we have been using a x86_64 distribution we use the following command to download the kernel headers:

#yum install kernel-headers-2.6.22-1-41.fc7.x86_64

Building Custom Kernel

There are many prebuilt packages at the repositories for the version of the kernel of the Fedora distribution.

With this procedure, we can build our own kernel in a way that will look the same as the Fedora distribution so we can use those prebuilt modules.

Download the latest kernel for your system, as August 2007, to get it:

$wget http://download.fedora.redhat.com/pub/fedora/linux/updates/7/SRPMS/kernel-

Once the file is downloaded:

#rpm -ivh kernel-
#cd /usr/src/redhat/SPECS

For x86_64:

#rpmbuild -bp --target x86_64 kernel-2.6.spec

For i686:

#rpmbuild -bp --target i686 kernel-2.6.spec

If you get the error: sparse >= 0.3 is needed by kernel-, just install sparce:

#yum install sparce

Now go to the directory /usr/src and delete any symbolic link pointing to another kernel:

#cd /usr/src
#rm linux

Now, create a new symbolic link:

#cd /usr/src

For x86_64:

#ln -s redhat/BUILD/kernel-2.6.22/linux-2.6.22.x86_64 linux
#cd kernels
#ln -s ../redhat/BUILD/kernel-2.6.22/linux-2.6.22.x86_64

For i686:

#ln -s redhat/BUILD/kernel-2.6.22/linux-2.6.22.i686 linux
#cd kernels
#ln -s ../redhat/BUILD/kernel-2.6.22/linux-2.6.22.i686

Go to /usr/src/linux, edit the Makefile, look for the line EXTRAVERSION and set it to .1-41.fc7, at the end, the line should look like:

EXTRAVERSION = .1-41.fc7

Now, perform the following commands to copy the original configuration of your Fedora installation:

#cp -p .config .config.orig
#make mrproper
#cp -p /boot/config- .config

If you want to perform changes in the configuration of the kernel, do a:

#make menuconfig

Once you're happy with your kernel, compile it, compile the modules and install it:

#make bzImage
#make modules
#make modules_install
#make install

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