Provided by: pciutils_3.9.0-4_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.

       -r     Avoids  bus  scan if each operation selects a specific device (uses the -s selector
              with specific domain, bus, slot, and function). This is faster, but if  the  device
              does not exist, it fails instead of matching an empty set of devices.

              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 one 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>][:<class>[:<prog-if>]]
              Select  devices with specified vendor, device, class ID, and programming interface.
              The ID's are given in hexadecimal and may be omitted or given as "*", both  meaning
              "any value". The class ID can contain "x" characters which stand for "any digit".

       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.

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

       •      Finally,  if  a capability exists multiple times you can choose which one to target
              using @number. Indexing starts at 0.

       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 <>.