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The syntax for using modprobe is modprobe module_name As with insmod, the module you load with modprobe resides in a subdirectory of /lib/modules/kernel_ version/kernel For example, the /lib/modules/kernel_version/kernel/net directory contains kernel modules for a variety of network boards, as shown in Figure 12-12 If I wanted to load the kernel module for the 3c509 network board, I would enter modprobe 3c509 at the shell prompt For PCI and AGP plug-n-play boards, this command is usually sufficient If, however, you re loading a kernel module for an older ISA board, you ll probably need to specify the IRQ and the I/O port the device has been configured to use To do this, just add the irq and io options with the command The syntax is modprobe module_name irq=IRQ_number io=I/O_port The I/O_port parameter must be specified in hexadecimal notation You re probably wondering, at this point, if the module will be persistent across system restarts after it s been loaded with modprobe The answer is no, it won t (unless the device is automatically detected during boot) However, modprobe is automatically run every time the kernel loads It reads the information contained in your /etc/modprobeconf file to determine what kernel modules should be loaded during startup This file is shown in Figure 12-13 If the /etc/modprobeconf file doesn t exist, then modprobe will use the files located in the /etc/modprobed directory to determine the kernel modules that will be loaded at boot
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FIGURE 12-12
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FIGURE 12-13
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The /etc/ modprobeconf file
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The modprobeconf file uses the following directives:
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Tells modprobe to load the specified module It can also be used to run any valid shell command, providing you with a high degree of flexibility when loading your modules
alias alias_name module_name options module_name options
Gives a kernel module an alias name that can be used to reference it from the shell prompt Gives modprobe a list of options, such as irq= or io=, that should be used when a particular kernel module loads
Notice in Figure 12-13 that there is a big note at the beginning of the file that warns you not to modify /etc/modprobeconf Instead, if you need to manually specify that a particular kernel module be loaded at system startup, you should enter it in the /etc/modprobeconflocal file using the modprobeconf directives just specified Alternatively, you could also insert the modprobe module_name command in your rclocal or bootlocal file to ensure that the module is loaded at system startup However, my experience has been that you will rarely need to do this Most distributions run some kind of hardware detection routine, such as kudzu on Fedora Linux, at system boot that scans for new hardware and automatically loads the appropriate kernel module
Manage Hardware and Kernel Modules
SCENARIO & SOLUTION
You need to see how interrupts have been assigned by the plug-n-play subsystem What file in /proc can you use to view this information You need to view information about the first IDE hard drive installed in your Linux system What command can you enter at the shell prompt to do this You ve just installed a 3Com 3C590 network board in your Linux system The device wasn t detected at boot, so you need to manually load the kernel module (3c59x) What command would you enter You can view /proc/interrupt
You can enter hdparm a /dev/hda
You would enter modprobe 3c59x at the shell prompt
What if you need to unload a currently loaded kernel module You can use the rmmod module_name command at the shell prompt Be warned that this command won t work if the device serviced by the module isn t in use If it is, the command won t remove the module Like insmod, rmmod doesn t take module dependencies into account and doesn t do anything with them If you want to remove a module and take dependencies into account, then you should use modprobe instead The syntax for removing a module with modprobe is modprobe r module_name Let s practice working with kernel modules in the following exercise
EXERCISE 12-1
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