1 .\" $FreeBSD: src/usr.sbin/pciconf/pciconf.8,v 1.8.2.9 2003/03/11 22:31:30 trhodes Exp $
2 .\" $DragonFly: src/usr.sbin/pciconf/pciconf.8,v 1.3 2008/07/23 14:14:44 swildner Exp $
4 .\" Stefan Esser <se@FreeBSD.org>. All rights reserved.
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33 .Nd diagnostic utility for the PCI bus
40 .Fl r Oo Fl b | h Oc Ar selector addr Ns Op : Ns Ar addr2
42 .Fl w Oo Fl b | h Oc Ar selector addr value
46 utility provides a command line interface to functionality provided by the
50 As such, it is only available to users with write access to
52 normally only the super-user.
56 option, it lists all devices found by the boot probe in the following format:
58 foo0@pci0:4:0: class=0x010000 card=0x00000000 chip=0x000f1000 rev=0x01 hdr=0x00
59 bar0@pci0:5:0: class=0x000100 card=0x00000000 chip=0x88c15333 rev=0x00 hdr=0x00
60 none0@pci0:6:0: class=0x020000 card=0x00000000 chip=0x802910ec rev=0x00 hdr=0x00
67 will attempt to load the vendor/device information database, and print
68 vendor, device, class and subclass identification strings for each device.
70 The first column gives the
71 device name, unit number, and
73 If there is no device configured in the kernel for the
75 device in question, the device name will be
77 Unit numbers for unconfigured devices start at zero and are incremented for
78 each unconfigured device that is encountered.
81 is in a form which may directly be used for the other forms of the command.
82 The second column is the class code, with the class byte printed as two
83 hex digits, followed by the sub-class and the interface bytes.
84 The third column gives the contents of the subvendorid register, introduced
85 in revision 2.1 of the
88 It is 0 for most current (2.0)
90 cards, but is supposed to be loaded with a unique card identification code
94 The field consists of the card ID in the upper
95 half and the card vendor ID in the lower half of the value.
97 The fourth column contains the chip device ID, which identifies the chip
98 this card is based on.
99 It consists of two fields, identifying the chip and
100 its vendor, as above.
101 The fifth column prints the chip's revision.
102 The sixth column describes the header type.
103 Currently assigned header types are 0 for all devices except
107 bridges, and 1 for such bridge chips.
108 If the most significant bit
109 of the header type register is set for
114 device, which contains several (similar or independent) functions on
124 .Li pci Ns Va bus Ns \&: Ns Va device
125 (optionally followed by
126 .Li \&: Ns Va function ) .
127 A final colon may be appended and
128 will be ignored; this is so that the first column in the output of
131 can be used without modification.
132 All numbers are base 10.
138 determines whether any driver has been assigned to the device
141 An exit status of zero indicates that the device has a driver;
142 non-zero indicates that it does not.
146 option reads a configuration space register at byte offset
150 and prints out its value in hexadecimal.
151 The optional second address
153 specifies a range to read.
158 into a configuration space register at byte offset
162 For both operations, the flags
166 select the width of the operation;
168 indicates a byte operation, and
170 indicates a halfword (two-byte) operation.
171 The default is to read or
172 write a longword (four bytes).
174 The PCI vendor/device information database is normally read from
175 .Pa /usr/share/misc/pci_vendors .
176 This path can be overridden by setting the environment variable
177 .Ev PCICONF_VENDOR_DATABASE .
185 utility appeared first in
197 utility was written by
200 .An Garrett Wollman .
206 options are implemented in
208 but not in the underlying
211 It might be useful to give non-root users access to the
216 But only root will be able to execute a
218 to provide the device with a driver KLD, and reading of configuration space
219 registers may cause a failure in badly designed