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           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 operat-
           ing 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  regis-
                  ters.  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  avail-
                  able, 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
           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  regis-
           ter,  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  reg-
                  ister.  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.


                  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 capabil-
                  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 <>.

    pciutils-3.1.8 02 October 2011 setpci(8)


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