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28 .Dd September 30, 2007
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 capabilities supported by each device.
119 Each capability will be enumerated via a line in the following format:
121 cap 10[40] = PCI-Express 1 root port
124 The first value after the
126 prefix is the capability ID in hexadecimal.
127 The second value in the square brackets is the offset of the capability
128 in config space in hexadecimal.
129 The format of the text after the equals sign is capability-specific.
135 will attempt to load the vendor/device information database, and print
136 vendor, device, class and subclass identification strings for each device.
145 .Li pci Ns Va domain Ns \&: Ns Va bus Ns \&: Ns Va device
146 (optionally followed by
147 .Li \&: Ns Va function ) .
148 A final colon may be appended and
149 will be ignored; this is so that the first column in the output of
152 can be used without modification.
153 All numbers are base 10.
159 determines whether any driver has been assigned to the device
162 An exit status of zero indicates that the device has a driver;
163 non-zero indicates that it does not.
167 option reads a configuration space register at byte offset
171 and prints out its value in hexadecimal.
172 The optional second address
174 specifies a range to read.
179 into a configuration space register at byte offset
183 For both operations, the flags
187 select the width of the operation;
189 indicates a byte operation, and
191 indicates a halfword (two-byte) operation.
192 The default is to read or
193 write a longword (four bytes).
195 The PCI vendor/device information database is normally read from
196 .Pa /usr/share/misc/pci_vendors .
197 This path can be overridden by setting the environment variable
198 .Ev PCICONF_VENDOR_DATABASE .
206 utility appeared first in
218 utility was written by
221 .An Garrett Wollman .
227 options are implemented in
229 but not in the underlying
232 It might be useful to give non-root users access to the
237 But only root will be able to execute a
239 to provide the device with a driver KLD, and reading of configuration space
240 registers may cause a failure in badly designed