1DEPMOD(8)                                                            DEPMOD(8)
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NAME

6       depmod - program to generate modules.dep and map files.
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SYNOPSIS

9       depmod  [  -b  basedir  ]  [ -e ]  [ -F System.map ]  [ -n ]  [ -v ]  [
10       version ]  [ -A ]
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12       depmod [ -e ]  [ -FSystem.map ]  [ -n ]  [ -v ]  [ version ]   [  file‐
13       name... ]
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DESCRIPTION

16       Linux  kernel modules can provide services (called "symbols") for other
17       modules to use (using EXPORT_SYMBOL in the code). If  a  second  module
18       uses  this symbol, that second module clearly depends on the first mod‐
19       ule. These dependencies can get quite complex.
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21       depmod creates a list of module dependencies  by  reading  each  module
22       under  /lib/modules/version and determining what symbols it exports and
23       what symbols it needs. By default, this list is written to  modules.dep
24       in the same directory. If filenames are given on the command line, only
25       those modules are examined (which is rarely useful unless  all  modules
26       are listed).
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28       If  a  version is provided, then that kernel version's module directory
29       is used rather than the current kernel version (as  returned  by  uname
30       -r).
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32       depmod  will  also generate various map files in this directory for use
33       by the hotplug infrastructure.
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OPTIONS

36       -a --all
37              Probe all modules. This option is enabled by default if no  file
38              names are given in the command-line.
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40       -A --quick
41              This  option scans to see if any modules are newer than the mod‐
42              ules.dep file before any work is done: if not, it silently exits
43              rather than regenerating the files.
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45       -b basedir --basedir basedir
46              If  your  modules  are  not  currently in the (normal) directory
47              /lib/modules/version, but in a staging area, you can  specify  a
48              basedir  which  is prepended to the directory name. This basedir
49              is stripped from the resulting modules.dep file, so it is  ready
50              to be moved into the normal location.
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52       -C --config file or directory
53              This   option   overrides  the  default  configuration  file  at
54              /etc/depmod.conf (or the /etc/depmod.d/ directory if that is not
55              found).
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57       -e --errsyms
58              When combined with the -F option, this reports any symbols which
59              a module needs which are not supplied by other  modules  or  the
60              kernel.  Normally,  any  symbols  not  provided  by  modules are
61              assumed to be provided by the kernel (which should be true in  a
62              perfect world).
63
64       -F --filesyms System.map
65              Supplied with the System.map produced when the kernel was built,
66              this allows the -e option to report unresolved symbols.
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68       -h --help
69              Print the help message and exit.
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71       -n --dry-run
72              This sends the resulting modules.dep and the various  map  files
73              to  standard  output  rather  than  writing them into the module
74              directory.
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76       -v --verbose
77              In verbose mode, depmod will print (to stdout) all  the  symbols
78              each module depends on and the module's file name which provides
79              that symbol.
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81       -V --version
82              Show version of program and exit. See below for caveats when run
83              on older kernels.
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86       This manual page Copyright 2002, Rusty Russell, IBM Corporation.
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SEE ALSO

89       depmod.conf(5), modprobe(8), modules.dep(5)
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93                                  2007-03-21                         DEPMOD(8)
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