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.
-v Tells setpci to be verbose and display detailed information
about configuration space accesses.
-f Tells setpci not to complain when theres nothing to do (when no
devices are selected). This option is intended for use in
widely-distributed configuration scripts where its uncertain
whether the device in question is present in the machine or not.
-D Demo mode -- dont write anything to the configuration regis
ters. Its useful to try setpci -vD to see what your complex
sequence of setpci operations does before you actually execute
Shows setpci version. This option should be used stand-alone.
Before each sequence of operations you need to select which devices you
wish that operation to affect.
Show 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" shows
only the fourth function of each device.
Select devices with specified vendor and device ID. Both IDs
are given in hexadecimal and may be omitted or given as "*",
both meaning "any value".
To query value of a configuration register, just name it (either by
typing its name or by typing register address with optional .B, .W or
.L suffix specifying register width as byte, word or longword).
To set a register, write reg=values where reg is the same as you would
use to query the register and values is a comma-separated list of val
ues you want to write starting with the given address. Each value to be
written can be specified either as a hexadecimal number or as a
bits:mask pair which causes the bits corresponding to binary ones in
the mask to be changed to values of the corresponding bits in the bits
setpci knows the following configuration register names. See PCI bus
specifications for their precise meaning or consult header.h or
/usr/include/linux/pci.h for a couple of comments.
The PCI utilities use PCILIB (a portable library providing platform-
independent functions for PCI configuration space access) to talk to
the PCI cards. Please see lspci(8) for a list of switches controlling
behavior of the library.
setpci -d *:* latency_timer=40 sets the latency timer to 64 (40 hex
setpci -s 0 device_id vendor_id lists IDs of devices in slot 0 in
setpci -s 12:3.4 3c.l=1,2,3 writes longword 1 to register 3c, 2 to
register 3d and 3 to register 3e of device at bus 12, slot 3, function
setpci -s 13:8.4 40.b=50:d0,04:0c,ff works on bus 13, device 8, func
tion 4: turns bit 7 off and bits 6 and 4 on in the byte register 40;
turns bit 3 off and bit 2 on in the byte register 41; sets byte regis
ter 42 to ff.
The PCI Utilities are maintained by Martin Mares .
pciutils-2.2.4-pre4 30 July 2006 setpci(8)