Web hosting billing - Documentation The /usr/src/linux-2.4/Documentation directory contains lots of
Documentation The /usr/src/linux-2.4/Documentation directory contains lots of plain-text files describing different aspects of the kernel and related drivers. Of particular interest is the modules.txt file (which describes how to work with modules) and the Configure.help file (which contains all the help files hardware drivers). kernel-doc The kernel-doc software package (available on CD-2 of the Red Hat Linux distribution) contains a large set of documents describing the kernel and drivers. These documents are stored in the /usr/share/doc/kernel-doc* directory. After modules have been built, they are installed in the /lib/modules/2.4* directory. The name of the directory is based on the current release number of the kernel. Modules that are in that directory can then be loaded and unloaded as they are needed. Note In previous releases, Red Hat Linux stored modules in the /lib/modules directory, rather than the /lib/moduels/2.4* directory. This structure allows you to store modules on your system that relate to different kernel versions you may be running. Listing loaded modules To see which modules are currently loaded into the running kernel on your computer, you can use the lsmod command. Here is an example: # lsmod Module Size Used by sr_mod 15120 0 (autoclean) es1371 26784 0 (autoclean) ac97_codec 8704 0 (autoclean) [es1371] gameport 1920 0 (autoclean) [es1371] soundcore 4112 4 (autoclean) [es1371] binfmt_misc 6272 1 nuscsitcp 17200 0 (unused) autofs 10816 1 (autoclean) tulip 46400 1 ipchains 36960 0 (unused) ide-scsi 8192 0 scsi_mod 93568 3 [sr_mod nuscsitcp ide-scsi] hid 18160 0 (unused) input 3456 0 [hid] usb-uhci 21440 0 (unused) usbcore 50432 1 [hid usb-uhci] ext3 50656 2 jbd 39376 2 [ext3] This output shows a variety of modules that have been loaded on a Linux system. The modules loaded on this system include several to support the Ensoniq 1371 sound card that is installed (es1371, ac97_codec, gameport, and soundcore). There are also modules to support the IDE CD-ROM drive that runs in SCSI emulation on this system (scsi_mod, sr_mod, nuscsitcp, and ide-scsi). To find information about any of the loaded modules, you can use the modinfo command. For example, you could type the following: # modinfo -d es1371 “ES1371 AudioPCI97 Driver” Not all modules have descriptions available. In this case, however, the es1371 module is described as an ES1371 AudioPCI87 Driver. You can also use the -a option to see the author of the module or -n to see the object file representing the module. The author information often has the e-mail address of the driver’s creator, so you can contact the author if you have problems or questions about it.
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