![Example for configuration Selecting necessary file systems File systems ---> Pseudo Filesystems ---> [*] /proc file system support [*] Virtual memory file system support (former shm fs) (Select one or more of the following options as needed by your system) Reiser, ext3, ext4, jfs, etc.,](https://image.slidesharecdn.com/kernelcompilation-110927020641-phpapp02/85/Kernel-compilation-9-320.jpg)
![Activating SMP support Processor type and features ---> [*] Symmetric multi-processing support Like that we can do for the following options Activating USB Support for Input Devices Enabling PCMCIA support](https://image.slidesharecdn.com/kernelcompilation-110927020641-phpapp02/85/Kernel-compilation-11-320.jpg)
Kernel compilation
- 1. OTP Training - Ganesh M C
- 2. Drivers and the kernel UNIX system has three layers: The hardware The operating system kernel The user-level programs Kernel Kernel hides the hardware, provides a abstract, high-level programming interface Process Signal and semaphores Virtual memory The filesystem Interprocess communication Kernel contains device drivers that manage its interaction with specific pieces of hardware. Size of kernel
- 3. Why Configure the kernel Generic kernel Many device drivers Optional packages Tailor the kernel for your need Less memory Well-tuned configuration Add support for new types of device Some system is simple Some may need to several steps. Read this: Building the kernel is not difficult; its just difficult to fix when you break it. Get a good reference book for your OS
- 4. Kernel Source Repository http://kernel.org/ Is the place where you could get the kernel source Compile it according to your need
- 5. Packages required to start compilation apt-get install build-essential apt-get install bin86 kernel-package apt-get install module-init-tools initrd-tools apt-get install fakeroot apt-get install libncurses5-dev
- 6. Kernel Compilation Decide where to build your kernel Good place is $HOME Deciding on a kernel version For any kernel version x.y.z, * x - This is the major revision number * y - This is the minor revision number, where: Even numbers indicate "stable" kernel releases Odd numbers indicate "development" or "beta" kernel releases which may be less stable. * z - This is the patch level of the kernel
- 7. Downloading the maintainer-specific patch. Unpacking the kernel source bash$ cd $HOME bash$ tar zxvf linux-x.y.z.tar.gz bash$ cd linux-x.y.z bash$ zcat ../patch-x.y.z-vrs1.gz | patch -p1 For Cross compilation linux/README and linux/Documentation/arm/README before proceeding. Both these files provide further useful information which may be specific to your kernel version.
- 8. Configuration of the kernel build environment To use the default configuration present in kernel source bash$ make <machinename>_defconfig Copies the config of /linux-2.6-2.6.32/arch/x86/configs/i386_defconfig to .config In this case no need to run oldconfig To do manual configuration run the command $make menuconfig
- 9. Example for configuration Selecting necessary file systems File systems ---> Pseudo Filesystems ---> [*] /proc file system support [*] Virtual memory file system support (former shm fs) (Select one or more of the following options as needed by your system) Reiser, ext3, ext4, jfs, etc.,
- 10. Selecting PPPoE necessary drivers Device Drivers ---> Networking Support ---> <*> PPP (point-to-point protocol) support <*> PPP support for async serial ports <*> PPP support for sync tty ports
- 11. Activating SMP support Processor type and features ---> [*] Symmetric multi-processing support Like that we can do for the following options Activating USB Support for Input Devices Enabling PCMCIA support
- 12. Manual Installation Compiling the kernel Make Make modules_install Installing the kernel cp arch/i386/boot/bzImage /boot/vmlinuz Generate the initrd by using the tool mkinitrd mkinitramfs -k -o /boot/initrd.img-KVN KVN Edit the grub.cfg & boot the kernel
- 13. To get the kernel in DEB make-kpkg --initrd --revision=boss4.0 kernel_image kernel_headers --us –uc --append-to-version --revision
- 14. SELinux Configure Compile as like normal kernel Edit the /etc/init.d/rc Add the parameter selinux=1 to kernel line of grub