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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 additional information for
127 specifically the resource ranges decoded by the bridge for use by devices
129 Each bridge lists a range of bus numbers handled by the bridge and its
131 Memory and I/O port decoding windows are enumerated via a line in the
134 window[1c] = type I/O Port, range 16, addr 0x5000-0x8fff, enabled
137 The first value after the
139 prefix in the square brackets is the offset of the decoding window in
140 config space in hexadecimal.
141 The type of a window is one of
143 .Dq Prefetchable Memory ,
146 The range indicates the binary log of the maximum address the window decodes.
147 The address field indicates the start and end addresses of the decoded range.
148 Finally, the last flag indicates if the window is enabled or disabled.
154 will list any base address registers
156 that are assigned resources for each device.
157 Each BAR will be enumerated via a line in the following format:
159 bar [10] = type Memory, range 32, base 0xda060000, size 131072, enabled
162 The first value after the
164 prefix in the square brackets is the offset of the BAR in config space in
166 The type of a BAR is one of
168 .Dq Prefetchable Memory ,
171 The range indicates the maximum address the BAR decodes.
172 The base and size indicate the start and length of the BAR's address window,
174 Finally, the last flag indicates if the BAR is enabled or disabled.
180 will list any capabilities supported by each device.
181 Each capability is enumerated via a line in the following format:
183 cap 10[40] = PCI-Express 1 root port
186 The first value after the
188 prefix is the capability ID in hexadecimal.
189 The second value in the square brackets is the offset of the capability
190 in config space in hexadecimal.
191 The format of the text after the equals sign is capability-specific.
193 Each extended capability is enumerated via a line in a similar format:
195 ecap 0002[100] = VC 1 max VC0
198 The first value after the
200 prefix is the extended capability ID in hexadecimal.
201 The second value in the square brackets is the offset of the extended
202 capability in config space in hexadecimal.
203 The format of the text after the equals sign is capability-specific.
209 will list any errors reported for this device in standard PCI error registers.
210 Errors are checked for in the PCI status register,
211 the PCI-express device status register,
212 and the Advanced Error Reporting status registers.
218 will attempt to load the vendor/device information database, and print
219 vendor, device, class and subclass identification strings for each device.
228 .Li pci Ns Va domain Ns \&: Ns Va bus Ns \&: Ns Va device Ns \&: \
230 .Li pci Ns Va bus Ns \&: Ns Va device Ns \&: Ns Va function , or
231 .Li pci Ns Va bus Ns \&: Ns Va device .
232 In case of an abridged form, omitted selector components are assumed to be 0.
233 An optional leading device name followed by @ and an optional final colon
234 will be ignored; this is so that the first column in the output of
237 can be used without modification.
238 All numbers are base 10.
244 determines whether any driver has been assigned to the device
247 An exit status of zero indicates that the device has a driver;
248 non-zero indicates that it does not.
252 option reads a configuration space register at byte offset
256 and prints out its value in hexadecimal.
257 The optional second address
259 specifies a range to read.
264 into a configuration space register at byte offset
268 For both operations, the flags
272 select the width of the operation;
274 indicates a byte operation, and
276 indicates a halfword (two-byte) operation.
277 The default is to read or
278 write a longword (four bytes).
280 The PCI vendor/device information database is normally read from
281 .Pa /usr/share/misc/pci_vendors .
282 This path can be overridden by setting the environment variable
283 .Ev PCICONF_VENDOR_DATABASE .
292 utility appeared first in
304 utility was written by
307 .An Garrett Wollman .
313 options are implemented in
315 but not in the underlying
318 It might be useful to give non-root users access to the
323 But only root will be able to execute a
325 to provide the device with a driver KLD, and reading of configuration space
326 registers may cause a failure in badly designed