setpci <root
setpci(8)                               The PCI Utilities                               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 
              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 =
              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 short‐
              hand for -A intel-conf1.)

       -H2    Use direct hardware access via Intel configuration mechanism 2.  (This is a  short‐
              hand 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 opera‐
       tion to affect.

       -s [[[[]:]]:][][.[]]
              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  hexadeci‐
              mal.  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 []:[]
              Select devices with specified vendor and device ID. Both ID's are given in hexadec‐
              imal 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 mul‐
       tiple 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 num‐
       bers. 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 configura‐
              tion headers. Use `setpci --dumpregs' to get the complete list.  See PCI bus speci‐
              fications  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 capa‐
              bility 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 liv‐
              ing 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 .

pciutils-3.3.1                            09 April 2015                                 setpci(8)

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