Difference between revisions of "Compiling a kernel"
From Linuxintro
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This is an example how to compile a Linux kernel. It has been tested for SUSE Linux 10.2 and kernel 2.6.21, but should work same or similar for every combination. | This is an example how to compile a Linux kernel. It has been tested for SUSE Linux 10.2 and kernel 2.6.21, but should work same or similar for every combination. | ||
| + | = Check prerequesites = | ||
* Make sure you have a compiler installed | * Make sure you have a compiler installed | ||
yast -i gcc | yast -i gcc | ||
| + | |||
| + | = Get the code = | ||
* Download the kernel from ftp.kernel.org | * Download the kernel from ftp.kernel.org | ||
wget ftp://ftp.kernel.org/pub/linux/kernel/v2.6/linux-2.6.21.tar.bz2 | wget ftp://ftp.kernel.org/pub/linux/kernel/v2.6/linux-2.6.21.tar.bz2 | ||
| Line 9: | Line 12: | ||
* unpack the kernel for the second time | * unpack the kernel for the second time | ||
tar xvf linux-2.6.21.tar | tar xvf linux-2.6.21.tar | ||
| + | |||
| + | = Build it = | ||
* configure the kernel | * configure the kernel | ||
cd linux-2.6.21 | cd linux-2.6.21 | ||
| Line 17: | Line 22: | ||
* compile the drivers | * compile the drivers | ||
make -j4 modules | make -j4 modules | ||
| + | |||
| + | = Install it = | ||
* install the drivers | * install the drivers | ||
make modules_install | make modules_install | ||
Revision as of 07:30, 7 February 2009
This is an example how to compile a Linux kernel. It has been tested for SUSE Linux 10.2 and kernel 2.6.21, but should work same or similar for every combination.
Check prerequesites
- Make sure you have a compiler installed
yast -i gcc
Get the code
- Download the kernel from ftp.kernel.org
wget ftp://ftp.kernel.org/pub/linux/kernel/v2.6/linux-2.6.21.tar.bz2
- unpack the kernel
bunzip linux-2.6.21.tar.bz2
- unpack the kernel for the second time
tar xvf linux-2.6.21.tar
Build it
- configure the kernel
cd linux-2.6.21 make oldconfig
- answer some un-understandable questions
- compile the kernel, note: on a two-CPU VMWare virtual machine with 2.4 GHz, this lasted 19m28.605s
make -j4
- compile the drivers
make -j4 modules
Install it
- install the drivers
make modules_install
- install the kernel
cp arch/x86_64/boot/bzImage /boot/vmlinuz-2.6.21
This will install the kernel for the x86_64 architecture.
- prepare the initial ramdisk
cp System.map /boot mkinitrd
This will build an initial ramdisk for all kernels contained in /boot.
- add an entry to the bootloader. Let's take grub's /boot/grub/menu.lst:
title 2.6.21-selfcompiled root (hd0,0) kernel /boot/vmlinuz-2.6.21 root=/dev/sda1 initrd /boot/initrd-2.6.21
