DEVCTL(8)

NAME
devctl - device control utility

SYNOPSIS
devctl attach device
devctl clear driver [-f] device
devctl detach [-f] device
devctl disable [-f] device
devctl enable device
devctl set driver [-f] device driver

DESCRIPTION
The devctl utility adjusts the state of individual devices in the kernel's internal device hierarchy. Each invocation of devctl consists of a single command followed by command-specific arguments. Each command operates on a single device specified via the device argument. The device may be specified either as the name of an existing device or as a bus-specific address. More details on supported address formats can be found in devctl(3).

The following commands are supported:

attach device
    Force the kernel to re-probe the device. If a suitable driver is found, it is attached to the device.

detach
    [-f] device Detach the device from its current device driver. If the -f flag is specified, the device driver will be detached even if the device is busy.

disable
    [-f] device Disable a device. If the device is currently attached to a device driver, the device driver will be detached from the device, but the device will retain its current name. If the -f flag is specified, the device driver will be detached even if the device is busy.

enable device
    Enable a device. The device will probe and attach if a suitable device driver is found. Note that this can re-enable a device disabled at boot time via a loader tunable.

set driver
    [-f] device driver Force the device to use a device driver named driver. If the device is already attached to a device driver and the -f flag is specified, the device will be detached from its current device driver before it is attached to the new device driver. If the device is already attached to a device driver and the -f flag is not specified, the device will not be changed.

clear driver
    [-f] device Clear a previously-forced driver name so that the device is able to use any valid device driver. After the previous name has been cleared, the device is reprobed so that other device drivers may attach to it. This can be used to undo an earlier set driver command. If the device is currently attached to a device driver and the -f flag is not specified, the device will not be changed.

SEE ALSO
devctl(3), devinfo(8)

HISTORY
The devctl utility first appeared in FreeBSD 10.3.