depmod -- program to generate modules.dep and map files.
depmod [-b basedir] [-e] [-F System.map] [-n] [-v] [version] [-A ]
depmod [-e] [-FSystem.map] [-n] [-v] [version] [filename ...]
Linux kernel modules can provide services (called “symbols") for other modules to use (using EXPORT_SYMBOL in the code). If a second module uses this symbol, that second module clearly depends on the first module. These dependencies can get quite complex.
depmod creates a list of module dependencies, by reading each module under /lib/modules/version and determining what symbols it exports, and what symbols it needs. By default this list is written to modules.dep in the same directory. If filenames are given on the command line, only those modules are examined (which is rarely useful, unless all modules are listed).
If a version is provided, then that kernel version’s module directory is used, rather than the current kernel version (as returned by “uname -r").
depmod will also generate various map files in this directory, for use by the hotplug infrastructure.
-b basedir --basedir basedir
If your modules are not currently in the (normal) directory /lib/modules/version, but in a staging area, you can specify a basedir which is prepended to the directory name. This basedir is stripped from the resulting modules.dep file, so it is ready to be moved into the normal location.
This version of depmod is for kernels 2.5.48 and above. If it detects a kernel with support for old-style modules, or the version specified is before 2.5.48, it will attempt to run depmod.old in its place, so it is completely transparent to the user.
This manual page Copyright 2002, Rusty Russell, IBM Corporation.
modprobe(8) , modules.dep(5) , depmod.old(8)
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