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 <method>
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 <param>=<value>
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 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.
DEVICE SELECTION
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
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" 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.
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 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:
* Tell its address in hexadecimal.
* 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/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 capability 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 living 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 <mj@ucw.cz>.
Opportunity
Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.
Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.
Free Software
Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.
Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.
Free Books
The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.
Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.
Education
Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.
Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.
