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       setpci - configure PCI devices


       setpci [options] devices operations...


       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.


   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.

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

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

              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

       -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.


       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.


       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:

       o      Tell its address in hexadecimal.

       o      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.

       o      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.

       o      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.

       o      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.   IP  o  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  accessing a named register whose width is
              well known.

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


              asks for the word-sized command register.

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

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

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

              corresponds  to  the  second  word  of  the   power   management

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


       lspci(8), pcilib(7)


       The PCI Utilities are maintained by Martin Mares <>.