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33 .Nd device driver for Winbond/Nuvoton Super I/O chips watchdog timer
35 To compile this driver into the kernel, place the following lines in your
36 kernel configuration file:
37 .Bd -ragged -offset indent
42 Alternatively, to load the driver as a module at boot time, place the following
45 .Bd -literal -offset indent
53 support for the watchdog interrupt timer present on at least the following
57 Winbond 83627HF/F/HG/G
98 driver provides the following options as
101 .Bl -tag -width "xxxxxx"
102 .It Va dev.wbwd.0.timeout_override
103 This variable allows to program the timer to a value independent on the one
106 framework while still relying on the regular updates from e.g.
108 This is particularly useful if your system provides multiple watchdogs and
109 you want them to fire in a special sequence to trigger an NMI after a shorter
110 period than the reset timeout for example.
111 The value set must not be lower than the sleep time of
113 A value of 0 disables this feature and the timeout value provided by
116 .It Va dev.wbwd.0.debug_verbose
117 If set this sysctl will tell the driver to log its current state before and
118 after the timer reset on each invocation from
120 to the kernel message buffer for debugging.
121 .It Va dev.wbwd.0.debug
122 This read-only value gives the state of some registers on last update.
127 driver also provides further sysctl options that are hidden by default.
128 See the source code for more information.
139 driver first appeared in
143 This manual page was written by
144 .An Bjoern A. Zeeb Aq Mt bz@FreeBSD.org .