Provided by: pciutils_3.3.1-1.1ubuntu1.3_amd64 bug


       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

   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.


       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:

       •      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.


              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-

              corresponds to the second word of the power management capability.

              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 <>.