Upgrading the Kernel

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Linux's brain--the kernel--gets updated frequently to include new features in operating systems, as well as additional support for hardware.

The easiest way to upgrade is to have a working kernel config use an existing config and make oldconfig.

Download the kernel source

Download the standard kernel .config as well as the 3.x kernel source tree.

<syntaxhighlight> cd /usr/src wget http://www.kernel.org/pub/linux/kernel/v3.0/linux-3.3.4.tar.bz2 tar -xjf linux-3.3.4.tar.bz2 </syntaxhighlight>

Configure the kernel

<syntaxhighlight> cd /usr/src/linux-3.3.4 cp /boot/linux-3.1.0-rc9.config . cp linux-3.1.0-rc9.config .config yes | make oldconfig make menuconfig </syntaxhighlight>

At the end of this step make menuconfig, you will be in the kernel configuration menu, for which you can fine-tune the drivers and options you wish to have built into your kernel.

Compiling and installing the kernel

<syntaxhighlight> make make modules_install make INSTALL_HDR_PATH=/usr/include headers_install cp arch/x86/boot/bzImage /boot/vmlinuz-3.3.4 cp System.map /boot/System.map-3.3.4 </syntaxhighlight>

Adjusting the LILO bootloader

Adjust your /etc/lilo.conf to boot your new kernel. It is advised to give it its own LILO entry until you are certain you are ready to abandon your old kernel/boot the new one by default.

Kernel 3.png

Understanding the steps

  • yes is a program that automates user answers. Without ' ', it will produce y to the scripts. Since many prompts require numerical answers (or blank for default values), y will not suffice. As a result, the recommended values for new kernel features will be included, and those not recommended will be excluded.
    • You can see this behavior by instead typing make oldconfig. The available options mostly are: (Y/n/m), indicating y is the default option and will be selected with a blank answer.
  • make menuconfig allows you to peruse the kernel source tree and make any modifications. A few features will be added by default, and you can decide if you want to remove them or not. Also, new features that did not exist in your previous kernel will be marked with (NEW).