setpci.man

The PCI Utilities package contains a library for portable access to PCI bus configuration registers

.TH setpci 8 "@TODAY@" "@VERSION@" "The PCI Utilities"
.IX setpci
.SH NAME
setpci \- configure PCI devices
.SH SYNOPSIS
.B setpci
.RB [ options ]
.B devices
.BR operations ...

.SH DESCRIPTION
.PP
.B 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
.BR lspci(8)
for details on access rights.

.SH OPTIONS
.TP
.B -v
Tells
.I setpci
to be verbose and display detailed information about configuration space accesses.
.TP
.B -f
Tells
.I 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.
.TP
.B -D
`Demo mode' -- don't write anything to the configuration registers.
It's useful to try
.B setpci -vD
to see what your complex sequence of
.B setpci
operations does before you actually execute it.
.TP
.B --version
Shows
.I setpci
version. This option should be used stand-alone.

.SH DEVICE SELECTION
.PP
Before each sequence of operations you need to select which devices you wish that
operation to affect.
.TP
.B -s [[[[<domain>]:]<bus>]:][<slot>][.[<func>]]
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.
.TP
.B -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".

.SH OPERATIONS
.PP
To query value of a configuration register, just name it (either by typing its name or
by typing register address with optional
.BR .B ,
.B .W
or
.B .L
suffix specifying register width as byte, word or longword).
.PP
To set a register, write
.BR reg = values
where
.B reg
is the same as you would use to query the register and
.B values
is a comma-separated list of values 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
.BR bits : mask
pair which causes the bits corresponding to binary ones in the
.B mask
to be changed to values of the corresponding bits in the
.B bits
.

.SH REGISTER NAMES
.PP
.B setpci
knows the following configuration register names. See PCI bus specifications for their precise
meaning or consult
.B header.h
or
.B /usr/include/linux/pci.h
for a couple of comments.
.PP
.nf
VENDOR_ID
DEVICE_ID
COMMAND
STATUS
REVISION
CLASS_PROG
CLASS_DEVICE
CACHE_LINE_SIZE
LATENCY_TIMER
HEADER_TYPE
BIST
BASE_ADDRESS_0
BASE_ADDRESS_1
BASE_ADDRESS_2
BASE_ADDRESS_3
BASE_ADDRESS_4
BASE_ADDRESS_5
CARDBUS_CIS
SUBSYSTEM_VENDOR_ID
SUBSYSTEM_ID
ROM_ADDRESS
INTERRUPT_LINE
INTERRUPT_PIN
MIN_GNT
MAX_LAT
PRIMARY_BUS
SECONDARY_BUS
SUBORDINATE_BUS
SEC_LATENCY_TIMER
IO_BASE
IO_LIMIT
SEC_STATUS
MEMORY_BASE
MEMORY_LIMIT
PREF_MEMORY_BASE
PREF_MEMORY_LIMIT
PREF_BASE_UPPER32
PREF_LIMIT_UPPER32
IO_BASE_UPPER16
IO_LIMIT_UPPER16
BRIDGE_ROM_ADDRESS
BRIDGE_CONTROL
CB_CARDBUS_BASE
CB_CAPABILITIES
CB_SEC_STATUS
CB_BUS_NUMBER
CB_CARDBUS_NUMBER
CB_SUBORDINATE_BUS
CB_CARDBUS_LATENCY
CB_MEMORY_BASE_0
CB_MEMORY_LIMIT_0
CB_MEMORY_BASE_1
CB_MEMORY_LIMIT_1
CB_IO_BASE_0
CB_IO_BASE_0_HI
CB_IO_LIMIT_0
CB_IO_LIMIT_0_HI
CB_IO_BASE_1
CB_IO_BASE_1_HI
CB_IO_LIMIT_1
CB_IO_LIMIT_1_HI
CB_SUBSYSTEM_VENDOR_ID
CB_SUBSYSTEM_ID
CB_LEGACY_MODE_BASE

.SH PCILIB OPTIONS
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
.BR lspci(8)
for a list of switches controlling behavior of the library.

.SH EXAMPLES
.PP
`setpci -d *:* latency_timer=40' sets the latency timer to 64 (40 hexadecimal).
.PP
`setpci -s 0 device_id vendor_id' lists ID's of devices in slot 0 in all buses.
.PP
`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.
.PP
`setpci -s 13:8.4 40.b=50:d0,04:0c,ff' works on bus 13, device 8, function
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 register
42 to ff.

.SH SEE ALSO
.BR lspci (8)

.SH AUTHOR
The PCI Utilities are maintained by Martin Mares <[e-mail]>.