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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.dep in the module directory for your current kernel version, /lib/modules/version. depmod -a
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The modprobe Command
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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. This example uses several values commonly used for sound cards. You would use the values recommended for your sound card on your system. modprobe sb io=0x220 irq=5 dma=1 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:
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# modprobe -l -t sound /lib/modules/2.4.20-8/kernel/drivers/sound/sb.o /lib/modules/2.4.20-8/kernel/drivers /sound/sb_lib.o /lib/modules/2.4.20-8/kernel/drivers /sound/sound.o /lib/modules/2.4.20-8/kernel/drivers /sound/soundcore.o
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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 automatically
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detects the 3Com Ethernet card and loads the 3c59x module): alias eth0 3c59x
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The insmod Command
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The insmod command performs the actual loading of modules. Both modprobe and the Kernel Module Loader make use of this command to load modules. Though modprobe is preferred, because it checks for dependencies, you can load or unload particular modules individually with insmod and rmmod commands. The insmod command takes as its argument the name of the module, as does rmmod. The name can be the simple base name, like sb for the sb.o module. You can specify the complete module file name using the -o option. Other helpful options are the -p option, which lets you probe your system first to see if the module can be successfully loaded, and the -n option, which performs all tasks except actually loading the module (a dummy run). The -v option (verbose) lists all actions taken as they occur. In those rare cases where you may have to force a module to load, you can use the -f option. In the next example, insmod loads the sb.o module. # insmod -v sb
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The rmmod Command
The rmmod command performs the actual unloading of modules. It is the command used by modprobe and the Kernel Module Loader to unload modules. You can use the rmmod command to remove a particular module as long as it is not being used or required by other modules. You can remove a module and all its dependent modules by using the -r option. The -a option removes all unused modules. With the -e option, when rmmod unloads a module, it saves any persistent data (parameters) in the persistent data directory, usually /var/lib/ modules/persist.
The /etc/modules.conf File
Notice that there is no device name for Ethernet devices in the /dev directory. This is because the device name is
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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 the alias. This way, the second Ethernet device can be referenced with the name eth1. A modules.conf entry is shown here: alias eth1 ne2k-pci
TIP After making changes to /etc/modules.conf, you should run depmod again to record any changes in module dependencies.
The previous entry assumes that the Ethernet card was of the same model. If you had added a different model Ethernet card, you would have to specify the module used for that kind of card. In the following example, the second card is a standard PCI Realtek card. Kmod has already automatically detected the new card and loaded the ne2k-pci module for you. You only need to identify this as the eth1 card in the /etc/modules.conf file. alias eth0 3c59x alias eth1 ne2k-pci A sample modules.conf file is shown here. Notice the aliases for the USB controller and the sound card. alias alias alias alias alias eth0 3c59x eth1 ne2k-pci parport_lowlevel parport_pc usb-controller usb-uhci sound-slot-0 i810_audio
TIP In some cases, Kmod may not detect a device in the way you want, and thereby not load the kernel module you would like. This was the case in 5, where you needed to provide SCSI emulation for IDE CD write devices. In this case, kernel parameters were specified to the GRUB boot loader to load the correct modules.
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