2 .\" Copyright (c) 2015 John Baldwin <jhb@FreeBSD.org>
3 .\" All rights reserved.
5 .\" Redistribution and use in source and binary forms, with or without
6 .\" modification, are permitted provided that the following conditions
8 .\" 1. Redistributions of source code must retain the above copyright
9 .\" notice, this list of conditions and the following disclaimer.
10 .\" 2. Redistributions in binary form must reproduce the above copyright
11 .\" notice, this list of conditions and the following disclaimer in the
12 .\" documentation and/or other materials provided with the distribution.
14 .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 .Nd device control utility
60 utility adjusts the state of individual devices in the kernel's
61 internal device hierarchy.
64 consists of a single command followed by command-specific arguments.
65 Each command operates on a single device specified via the
70 may be specified either as the name of an existing device or as a
72 More details on supported address formats can be found in
75 The following commands are supported:
76 .Bl -tag -width indent
77 .It Cm attach Ar device
78 Force the kernel to re-probe the device.
79 If a suitable driver is found,
80 it is attached to the device.
85 Detach the device from its current device driver.
89 the device driver will be detached even if the device is busy.
95 If the device is currently attached to a device driver,
96 the device driver will be detached from the device,
97 but the device will retain its current name.
101 the device driver will be detached even if the device is busy.
102 .It Cm enable Ar device
104 The device will probe and attach if a suitable device driver is found.
105 Note that this can re-enable a device disabled at boot time via a
111 Force the device to use a device driver named
113 If the device is already attached to a device driver and the
116 the device will be detached from its current device driver before it is
117 attached to the new device driver.
118 If the device is already attached to a device driver and the
120 flag is not specified,
121 the device will not be changed.
122 .It Xo Cm clear driver
126 Clear a previously-forced driver name so that the device is able to use any
128 After the previous name has been cleared,
129 the device is reprobed so that other device drivers may attach to it.
130 This can be used to undo an earlier
133 If the device is currently attached to a device driver and the
135 flag is not specified,
136 the device will not be changed.
144 utility first appeared in