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DEPMOD(8)                                                            DEPMOD(8)

       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 ]   [  file-
       name... ]

       Linux  kernel modules can provide services (called "symbols") for other
       modules to use (using one of the EXPORT_SYMBOL variants 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,
       and  a  binary hashed version named modules.dep.bin, in the same direc-
       tory. If filenames are given on the command line,  only  those  modules
       are  examined  (which  is rarely useful unless all modules are listed).
       depmod also creates a list of symbols provided by modules in  the  file
       named  modules.symbols  and  its  binary  hashed  version, modules.sym-

       If a version is provided, then that kernel version's  module  directory
       is  used  rather  than the current kernel version (as returned by uname

       depmod will also generate various legacy map files in the output direc-
       tory  for  use by the older hotplug infrastructure. These map files are
       largely deprecated.

       -a --all
              Probe all modules. This option is enabled by default if no  file
              names are given in the command-line.

       -A --quick
              This  option scans to see if any modules are newer than the mod-
              ules.dep file before any work is done: if not, it silently exits
              rather than regenerating the files.

       -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. Use this option if you are
              a distribution vendor who needs to  pre-generate  the  meta-data
              files rather than running depmod again later.

       -C --config file or directory
              This   option   overrides  the  default  configuration  file  at
              /etc/depmod.conf (or the /etc/depmod.d/ directory if that is not

       -e --errsyms
              When combined with the -F option, this reports any symbols which
              a module needs which are not supplied by other  modules  or  the
              kernel.  Normally,  any  symbols  not  provided  by  modules are
              assumed to be provided by the kernel (which should be true in  a
              perfect  world),  but this assumption can break espencially when
              additionally updated  third  party  drivers  are  not  correctly
              installed or were built incorrectly.

       -F --filesyms System.map
              Supplied with the System.map produced when the kernel was built,
              this allows the -e option to report unresolved symbols.

       -h --help
              Print the help message and exit.

       -n --dry-run
              This sends the resulting modules.dep and the various  map  files
              to  standard  output  rather  than  writing them into the module

       -v --verbose
              In verbose mode, depmod will print (to stdout) all  the  symbols
              each module depends on and the module's file name which provides
              that symbol.

       -V --version
              Show version of program and exit. See below for caveats when run
              on older kernels.

       This manual page originally Copyright 2002, Rusty Russell, IBM Corpora-
       tion. Maintained by Jon Masters and others.

       depmod.conf(5), depmod.d(5), modprobe(8), modules.dep(5)

                                  2010-03-01                         DEPMOD(8)

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