NAME¶
wbwd —
device driver for watchdog timer found on Winbond
Super I/O chips
SYNOPSIS¶
To compile this driver into the kernel, place the following line in your kernel
configuration file:
device wbwd
Alternatively, to load the driver as a module at boot time, place the following
line in
loader.conf(5):
DESCRIPTION¶
The
wbwd driver provides
watchdog(4) support for the watchdog interrupt
timer present on at least the following Winbond Super I/O chips:
- 83627HF/F/HG/G Rev. G
- 83627HF/F/HG/G Rev. J
- 83627HF/F/HG/G Rev. UD-A
- 83627DHG IC ver. 5
SYSCTL VARIABLES¶
The
wbwd driver provides the following
options as
sysctl(8) variables.
- dev.wbwd.0.timeout_override
- This variable allows to program the timer to a value independent on the
one provided by the watchdog(4) framework
while still relying on the regular updates from e.g.
watchdogd(8). This is particularly useful if
your system provides multiple watchdogs and you want them to fire in a
special sequence to trigger an NMI after a shorter period than the reset
timeout for example. The value set must not be lower than the sleep time
of watchdogd(8). A value of 0 disables this
feature and the timeout value provided by
watchdog(4) will be used.
- dev.wbwd.0.debug_verbose
- If set this sysctl will tell the driver to log its current state before
and after the timer reset on each invocation from
watchdog(9) to the kernel message buffer for
debugging.
- dev.wbwd.0.debug
- This read-only value gives the state of some registers on last
update.
The
wbwd driver also provides further sysctl
options that are hidden by default. See the source code for more information.
SEE ALSO¶
watchdog(4),
device.hints(5),
watchdog(8),
watchdogd(8),
watchdog(9)
HISTORY¶
The
wbwd driver first appeared in
FreeBSD 10.0.
AUTHORS¶
This manual page was written by
Bjoern A.
Zeeb ⟨bz@FreeBSD.org⟩.
