setpci(8) Linux PCI Utilities setpci(8)
setpci - configure PCI devices
setpci [options] devices operations...
setpci is a utility for querying and configuring PCI devices.
To make use of all the features of this program, you need to have Linux kernel 2.1.82 or
newer which supports the /proc/bus/pci interface. With older kernels, the PCI utilities
have to use direct hardware access which is available only to root and it suffers from
numerous race conditions and other problems.
All numbers are entered in hexadecimal notation.
-v Tells setpci to be verbose and display detailed information about configuration
-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' -- simulate configuration space accesses instead of really doing them.
It's useful to try setpci -vD to see what your complex sequence of setpci opera-
tions does before you actually execute it.
Shows setpci version. This option should be used standalone.
Before each sequence of operations you need to select which devices you wish that opera-
tion to affect.
Select devices in specified bus, slot and function. Each component of the device
address can be omitted or set as "*" 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 busses and ".4" selects
only fourth function of each device.
Select devices with specified vendor and device ID. Both ID's are given in hexadec-
imal and may be omitted or given as "*" 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 you would use to query the reg-
ister and values is a comma-separated list of values you want to write starting with the
setpci knows the following configuration register names. See PCI bus specs for their pre-
cise meaning or consult /usr/include/linux/pci.h for few comments.
The PCI utilities use PCILIB (a portable library providing platform-independent functions
for PCI configuration space access) to talk to the PCI cards. The following options con-
trol parameters of the library, especially what access method it uses. By default, PCILIB
uses the first available access method and displays no debugging messages. Each switch is
accompanied by a list of hardware/software configurations it's supported in.
Use Linux 2.1 style configuration access to directory <dir> instead of
/proc/bus/pci. (Linux 2.1 or newer only)
-H1 Use direct hardware access via Intel configuration mechanism 1. (i386 and compati-
-H2 Use direct hardware access via Intel configuration mechanism 2. Warning: This
method is able to address only first 16 devices on any bus and it seems to be very
unrealiable in many cases. (i386 and compatible only)
-S Use PCI access syscalls. (Linux on Alpha and UltraSparc only)
Extract all information from given file containing output of lspci -x. This is very
useful for analysis of user-supplied bug reports, because you can display the hard-
ware configuration in any way you want without disturbing the user with requests
for more dumps. (All systems)
-G Increase debug level of the library. (All systems)
`setpci -d *:* latency_timer=40' sets the latency timer to 64 (40 hexadecimal).
`setpci -s 0 device_id vendor_id' lists ID's of devices in slot 0 in all busses.
`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 4.
The Linux PCI Utilities are maintained by Martin Mares <email@example.com>.
pciutils-2.1.10 30 March 2002 setpci(8)