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Command lsmod insmod rmmod modinfo depmod modprobe
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The filename for a module has the extension .o. Modules reside in the /lib/modules/version directory, where version is the version number for your current module. The directory for the 2.4 kernel is /lib/modules/2.4.7-10. As you install new kernels on your system, new module directories are generated for them. One trick 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.
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cd /lib/modules/'uname r'
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In this directory, modules for the kernel reside in the kernel directory. And 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
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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, you should only use modprobe for these tasks. See Table 33-12 for kernel module commands. It is often the case, however, that 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. 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
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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 need to execute depmod with the -a option once, before you ever use modprobe. Entering depmod -a creates a complete listing of all module dependencies. This command creates a file called modules.deb in the module directory for your current kernel version, /lib/modules/version.
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depmod -a
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To install a module manually, you use the modprobe command and the module name. You can add any parameters the module may require. The following command installs the Sound Blaster sound module with the I/O, IRQ, and DMA values. modprobe also supports the use of the * character to enable you to use a pattern to select several modules.
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modprobe sb io=0x220 irq=5 dma=1
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To discover what parameters a module takes, you can use the modinfo command with the p option.
modinfo p sb
You can use the -l option to list modules and the -t option to look for modules in a specified subdirectory. In the next example, the user lists all modules in the sound directory:
# modprobe -l -t sound /lib/modules/2.4.7-10/kernel/drivers/sound/sb.o /lib/modules/2.4.7-10/kernel/drivers/sound/sb_lib.o /lib/modules/2.4.7-10/kernel/drivers/sound/sound.o /lib/modules/2.4.7-10/kernel/drivers/sound/soundcore.o
Options for the modprobe command are placed in the /etc/modules.conf file. Here, you can enter configuration options, such as default directories and aliases. An alias provides a simple name for a module. For example, the following entry enables you to reference the 3c59x.o Ethernet card module as eth0 (Kmod will automatically detect the 3Com Ethernet card and load the 3c59x module):
alias eth0 3c59x
Notice that there is no device name for Ethernet devices in the /dev directory. This is because the device name is really an alias for a Ethernet network module that has been defined in the modules.conf file. If you were to add another Ethernet card of the same type, you would place an alias for it in the modules.conf file. For a second Ethernet card, you would use the device name eth1 as its alias. This way, the second Ethernet device can be referenced with the name eth1. A modules.conf entry is shown here:
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