Running Linux, 5th Edition - Matthias Kalle Dalheimer [343]
Some older kernels require you at this point to run make dep to gather dependencies for each source file and include them in the various makefiles. This step is not necessary for current kernels (such as the 2.6 series).
If you have built a kernel from this source tree before, run make clean to clear out old object files and force a complete rebuild.
Run make bzImage to build the kernel itself.
Go have a coffee (or two, depending on the speed of your machine and amount of available memory).
Install the new kernel image, either on a boot floppy or via GRUB. You can use make bzDisk to put the kernel on a boot floppy.
All these commands are executed from /usr/src/linux, except for step 5, which you can do anywhere.
A README file is included in the kernel sources, which should be located at /usr/src/linux/README on your system. Read it. It contains up-to-date notes on kernel compilation, which may be more current than the information presented here. Be sure to follow the steps described there, using the descriptions given later in this section as a guide. If you have installed the kernel sources from a package included with your distribution, there may also be a file with distribution-specific notes that tells you how your distribution's packagers have configured the kernel, and whether (and how) the kernel changes have been changed from the pristine sources that you can download from the net.
Kernel configuration: make config
The first step is to run make config. This executes a script that asks you a set of yes/no questions about which drivers to include in the kernel. There are defaults for each question, but be careful: the defaults probably don't correspond to what you want. (When several options are available, the default will be shown as a capital letter, as in [Y/n].) Your answers to each question will become the default the next time you build the kernel from this source tree.
Simply answer each question, either by pressing Enter for the default, or pressing y or n (followed by Enter). Some questions don't have a yes/no answer; you may be asked to enter a number or some other value. A number of the configuration questions allow an answer of m in addition to y or n. This option allows the corresponding kernel feature to be compiled as a loadable kernel module, as opposed to building it into the kernel image itself. Loadable modules, covered in the following section, "Loadable Device Drivers," allow portions of the kernel (such as device drivers) to be loaded and unloaded as needed on a running system. If you are unsure about an option, type ? at the prompt; for most options, a message will be shown that tells you more about the option.
The system remembers your configuration options each time you run make config, so if you're adding or removing only a few features from your kernel, you need not re-enter all the options.
Some people say that make config has so many options now that it is hardly feasible to run it by hand any longer, as you have to concentrate for a long time to press the right keys in response to the right questions. Therefore, people are moving to the alternatives described next.
An alternative to running make config is make xconfig, which compiles and runs an X-Window-based kernel configuration program. In order for this to work, you must have the X Window System running, have the appropriate X11 and Qt libraries installed, and so forth. Instead of asking a series of questions, the X-based configuration utility allows you to use checkboxes to select which kernel options you want to enable.
Also available is make menuconfig, which uses the text-based curses library, providing a similar menu-based kernel configuration if you don't have X installed. make menuconfig and make xconfig are much more comfortable than make config, especially because you can go back to an option and change your mind up to the point where you save your configuration. However, we'll describe the process here in a linear fashion, as make config