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26 .\" $FreeBSD: src/usr.sbin/pciconf/pciconf.8,v 1.34 2010/09/09 18:51:20 jhb Exp $
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, some of the functions are only available to users with write
53 normally only the super-user.
57 option, it lists all devices found by the boot probe in the following format:
59 foo0@pci0:0:4:0: class=0x010000 card=0x00000000 chip=0x000f1000 rev=0x01 \
61 bar0@pci0:0:5:0: class=0x000100 card=0x00000000 chip=0x88c15333 rev=0x00 \
63 none0@pci0:0:6:0: class=0x020000 card=0x00000000 chip=0x802910ec rev=0x00 \
67 The first column gives the
68 device name, unit number, and
70 If there is no device configured in the kernel for the
72 device in question, the device name will be
74 Unit numbers for unconfigured devices start at zero and are incremented for
75 each unconfigured device that is encountered.
78 is in a form which may directly be used for the other forms of the command.
79 The second column is the class code, with the class byte printed as two
80 hex digits, followed by the sub-class and the interface bytes.
81 The third column gives the contents of the subvendorid register, introduced
82 in revision 2.1 of the
85 Note that it will be 0 for older cards.
86 The field consists of the card ID in the upper
87 half and the card vendor ID in the lower half of the value.
89 The fourth column contains the chip device ID, which identifies the chip
90 this card is based on.
91 It consists of two fields, identifying the chip and
93 The fifth column prints the chip's revision.
94 The sixth column describes the header type.
95 Currently assigned header types include 0 for most devices,
105 If the most significant bit
106 of the header type register is set for
111 device, which contains several (similar or independent) functions on
118 will list any base address registers
120 that are assigned resources for each device.
121 Each BAR will be enumerated via a line in the following format:
123 bar [10] = type Memory, range 32, base 0xda060000, size 131072, enabled
126 The first value after the
128 prefix in the square brackets is the offset of the BAR in config space in
130 The type of a BAR is one of
132 .Dq Prefetchable Memory ,
135 The range indicates the maximum address the BAR decodes.
136 The base and size indicate the start and length of the BAR's address window,
138 Finally, the last flag indicates if the BAR is enabled or disabled.
144 will list any capabilities supported by each device.
145 Each capability is enumerated via a line in the following format:
147 cap 10[40] = PCI-Express 1 root port
150 The first value after the
152 prefix is the capability ID in hexadecimal.
153 The second value in the square brackets is the offset of the capability
154 in config space in hexadecimal.
155 The format of the text after the equals sign is capability-specific.
157 Each extended capability is enumerated via a line in a similar format:
159 ecap 0002[100] = VC 1 max VC0
162 The first value after the
164 prefix is the extended capability ID in hexadecimal.
165 The second value in the square brackets is the offset of the extended
166 capability in config space in hexadecimal.
167 The format of the text after the equals sign is capability-specific.
173 will attempt to load the vendor/device information database, and print
174 vendor, device, class and subclass identification strings for each device.
183 .Li pci Ns Va domain Ns \&: Ns Va bus Ns \&: Ns Va device Ns \&: \
185 .Li pci Ns Va bus Ns \&: Ns Va device Ns \&: Ns Va function Ns , or
186 .Li pci Ns Va bus Ns \&: Ns Va device Ns .
187 In case of an abridged form, omitted selector components are assumed to be 0.
188 An optional leading device name followed by @ and an optional final colon
189 will be ignored; this is so that the first column in the output of
192 can be used without modification.
193 All numbers are base 10.
199 determines whether any driver has been assigned to the device
202 An exit status of zero indicates that the device has a driver;
203 non-zero indicates that it does not.
207 option reads a configuration space register at byte offset
211 and prints out its value in hexadecimal.
212 The optional second address
214 specifies a range to read.
219 into a configuration space register at byte offset
223 For both operations, the flags
227 select the width of the operation;
229 indicates a byte operation, and
231 indicates a halfword (two-byte) operation.
232 The default is to read or
233 write a longword (four bytes).
235 The PCI vendor/device information database is normally read from
236 .Pa /usr/share/misc/pci_vendors .
237 This path can be overridden by setting the environment variable
238 .Ev PCICONF_VENDOR_DATABASE .
247 utility appeared first in
259 utility was written by
262 .An Garrett Wollman .
268 options are implemented in
270 but not in the underlying
273 It might be useful to give non-root users access to the
278 But only root will be able to execute a
280 to provide the device with a driver KLD, and reading of configuration space
281 registers may cause a failure in badly designed