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.
Tells setpci to be verbose and display detailed information about configuration space accesses.
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.
`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 operations does before you actually execute it.
Before each sequence of operations you need to select which devices you wish that operation to affect.
Select devices in specified bus, slot and function. Each component of the device address can be omitted or set as
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).
setpci knows the following configuration register names. See PCI bus specs for their precise 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 control 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 instead of /proc/bus/pci. (Linux 2.1 or newer only)
Use direct hardware access via Intel configuration mechanism 1. (i386 and compatible only)
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)
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 hardware configuration in any way you want without disturbing the user with requests for more dumps. (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.