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The modules your system needs are usually determined during installation, based on the kind of configuration information you provided and the automatic detection performed by Kudzu. For example, if your system uses an Ethernet card whose type you specified during installation, the system loads the module for that card. You can, however, manually control what modules are to be loaded for your system. In effect, this enables you to customize your kernel whatever way you want. You can use several commands, configuration tools, and daemons to manage kernel modules. The 2.4 Linux kernel includes the Kernel Module Loader (Kmod), which has the capability to load modules automatically as they are needed. Kernel module loading support must also be enabled in the Kernel, though
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this is usually considered part of a standard configuration and is included with Red Hat distributions. In addition, several tools enable you to load and unload modules manually, if you must. The Kernel Module Loader uses certain kernel commands to perform the task of loading or unloading modules. The modprobe command is a general-purpose command that calls insmod to load modules and rmmod to unload them. These commands are listed in Table 7-5. Options for particular modules, general configuration, and even specific module loading can be specified in the /etc/modules.conf file. You can use this file to automatically load and configure modules. You can also specify modules to be loaded at the boot prompt or in grub.conf (see 1).
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Module Files and Directories
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The filename for a module has the extension .o. Kernel modules reside in the /lib/modules/version directory, where version is the version number for your current kernel. The directory for the 2.4.20-8 kernel is /lib/ modules/2.4.20-8. As you install new kernels on your system, new module directories are generated
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Command lsmod insmod rmmod modinfo Description Lists modules currently loaded. Loads a module into the kernel. Does not check for dependencies. Unloads a module currently loaded. Does not check for dependencies. Displays information about a module: -a (author),-d (description), -p (module parameters), -f (module filename), -v (module version) Creates a dependency file listing all other modules on which the specified module may rely. Loads a module with any dependent modules it may also need. Uses the file of dependency listings generated by depmod: -r (unload a module), -l (list modules) Kernel Module Commands
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Table 7-5.
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Devices and Modules
for them. One method to access the directory for the current kernel is to use the uname -r command to generate the kernel version number. This command needs to have backquotes. cd /lib/modules/`uname -r` In this directory, modules for the kernel reside in the /kernel directory. Within the /kernel directory are several subdirectories, including the /drivers directory that holds subdirectories for modules like the sound drivers or video drivers. These subdirectories serve to categorize your modules, making them easier to locate. For example, the kernel/drivers/net directory holds modules for your Ethernet cards, and the kernel/drivers/sound directory contains sound card modules.
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Managing Modules with /etc/modules.conf
As noted previously, there are several commands you can use to manage modules. The lsmod command lists the modules currently loaded into your kernel, and modinfo provides information about particular modules. Though you can use the insmod and rmmod commands to load or unload modules directly, you should only use modprobe for these tasks. See Table 7-5 for kernel module commands. Often, however, a given module requires other modules to be loaded. For example, the module for the Sound Blaster sound card, sb.o, requires the sound.o module to be loaded also.
The depmod Command
Instead of manually trying to determine what modules a given module depends on, you use the depmod command to detect the dependencies for you. The depmod command generates a file that lists all the modules on which a given module depends. The depmod command generates a hierarchical listing, noting what modules should be loaded first and in what order. Then, to load the module, you use the modprobe command using that file. modprobe reads the file generated by depmod and loads any dependent modules in the correct order, along with the module you want. You
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