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setpci(8)		       The PCI Utilities		     setpci(8)

       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 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  pa-
	      rameters.	 This option allows to set the value of	any of the pa-
	      rameters.	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  ma-
	      chine  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" se-
	      lects 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:

       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/in-
	      clude/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 reg-
	      ister. 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.

       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 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-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-3.5.4		       25 February 2017			     setpci(8)


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