setpci(8)


NAME

   setpci - configure PCI devices

SYNOPSIS

   setpci [options] devices operations...

DESCRIPTION

   setpci is a utility for querying and configuring PCI devices.

   All numbers are entered in hexadecimal notation.

   Root  privileges  are  necessary  for  almost all operations, excluding
   reads of the  standard  header  of  the  configuration  space  on  some
   operating systems.  Please see lspci(8) for details on access rights.

OPTIONS

   General options
   -v     Tells  setpci  to  be  verbose  and display detailed information
          about configuration space accesses.

   -f     Tells setpci not to complain when there's nothing to do (when no
          devices  are  selected).   This  option  is  intended for use in
          widely-distributed configuration scripts  where  it's  uncertain
          whether the device in question is present in the machine or not.

   -D     `Demo  mode'  --  don't  write  anything  to  the  configuration
          registers.  It's useful to try setpci -vD to  verify  that  your
          complex  sequence  of  setpci  operations does what you think it
          should do.

   --version
          Show setpci version. This option should be used stand-alone.

   --help Show detailed help on available options. This option  should  be
          used stand-alone.

   --dumpregs
          Show  a  list  of all known PCI registers and capabilities. This
          option should be used stand-alone.

   PCI access options
   The PCI utilities use the PCI library  to  talk  to  PCI  devices  (see
   pcilib(7)  for details). You can use the following options to influence
   its behavior:

   -A <method>
          The library supports a variety of  methods  to  access  the  PCI
          hardware.    By   default,  it  uses  the  first  access  method
          available,  but  you  can  use  this  option  to  override  this
          decision.  See -A help for a list of available methods and their
          descriptions.

   -O <param>=<value>
          The behavior of the  library  is  controlled  by  several  named
          parameters.   This  option allows to set the value of any of the
          parameters. Use -O help for a list of known parameters and their
          default values.

   -H1    Use  direct hardware access via Intel configuration mechanism 1.
          (This is a shorthand for -A intel-conf1.)

   -H2    Use direct hardware access via Intel configuration mechanism  2.
          (This is a shorthand for -A intel-conf2.)

   -G     Increase debug level of the library.

DEVICE SELECTION

   Before each sequence of operations you need to select which devices you
   wish that operation to affect.

   -s [[[[<domain>]:]<bus>]:][<slot>][.[<func>]]
          Consider only devices in the  specified  domain  (in  case  your
          machine has several host bridges, they can either share a common
          bus number space or each of them can address a PCI domain of its
          own;  domains  are numbered from 0 to ffff), bus (0 to ff), slot
          (0 to 1f) and function (0 to 7).  Each component of  the  device
          address  can be omitted or set to "*", both meaning "any value".
          All numbers are hexadecimal.  E.g., "0:" means  all  devices  on
          bus  0,  "0"  means  all functions of device 0 on any bus, "0.3"
          selects third function of device 0 on all buses and ".4" matches
          only the fourth function of each device.

   -d [<vendor>]:[<device>]
          Select  devices  with  specified vendor and device ID. Both ID's
          are given in hexadecimal and may be omitted  or  given  as  "*",
          both meaning "any value".

   When  -s and -d are combined, only devices that match both criteria are
   selected. When multiple options of the same  kind  are  specified,  the
   rightmost one overrides the others.

OPERATIONS

   There  are  two  kinds  of  operations:  reads  and  writes.  To read a
   register,   just   specify   its   name.   Writes   have    the    form
   name=value,value...  where each value is either a hexadecimal number or
   an  expression  of  type  data:mask  where  both  data  and  mask   are
   hexadecimal numbers. In the latter case, only the bits corresponding to
   binary ones in the mask are  changed  (technically,  this  is  a  read-
   modify-write operation).

   There are several ways how to identity a register:

   *      Tell its address in hexadecimal.

   *      Spell  its  name. Setpci knows the names of all registers in the
          standard configuration headers. Use `setpci --dumpregs'  to  get
          the  complete  list.  See PCI bus specifications for the precise
          meaning   of   these   registers   or   consult   header.h    or
          /usr/include/pci/pci.h for a brief sketch.

   *      If  the  register is a part of a PCI capability, you can specify
          the name of the capability to  get  the  address  of  its  first
          register.  See  the names starting with `CAP_' or `ECAP_' in the
          --dumpregs output.

   *      If the name of the capability is not known to  setpci,  you  can
          refer  to it by its number in the form CAPid or ECAPid, where id
          is the numeric identifier of the capability in hexadecimal.

   *      Each of the previous formats can be followed by +offset  to  add
          an  offset  (a  hex  number) to the address. This feature can be
          useful for addressing of registers living within  a  capability,
          or to modify parts of standard registers.

   *      Finally,  you  should  append a width specifier .B, .W, or .L to
          choose how many bytes (1, 2, or 4) should  be  transferred.  The
          width  can  be omitted if you are referring to a register by its
          name and the width of the register is well known.

   All names of registers and width specifiers are case-insensitive.

EXAMPLES

   COMMAND
          asks for the word-sized command register.

   4.w    is a numeric address of the same register.

   COMMAND.l
          asks for a 32-bit word starting at the location of  the  command
          register, i.e., the command and status registers together.

   VENDOR_ID+1.b
          specifies  the  upper  byte of the vendor ID register (remember,
          PCI is little-endian).

   CAP_PM+2.w
          corresponds  to  the  second  word  of  the   power   management
          capability.

   ECAP108.l
          asks  for  the first 32-bit word of the extended capability with
          ID 0x108.

SEE ALSO

   lspci(8), pcilib(7)

AUTHOR

   The PCI Utilities are maintained by Martin Mares <mj@ucw.cz>.





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