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WBWD(4)			 BSD Kernel Interfaces Manual		       WBWD(4)

NAME
     wbwd -- device driver for Winbond/Nuvoton Super I/O chips watchdog	timer

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):

	   wbwd_load="YES"

DESCRIPTION
     The wbwd driver provides watchdog(4) support for the watchdog interrupt
     timer present on at least the following Super I/O chips:
     +o	 Winbond 83627HF/F/HG/G
     +o	 Winbond 83627S
     +o	 Winbond 83697HF
     +o	 Winbond 83697UG
     +o	 Winbond 83637HF
     +o	 Winbond 83627THF
     +o	 Winbond 83687THF
     +o	 Winbond 83627EHF
     +o	 Winbond 83627DHG
     +o	 Winbond 83627UHG
     +o	 Winbond 83667HG
     +o	 Winbond 83627DHG-P
     +o	 Winbond 83667HG-B
     +o	 Nuvoton NCT6775
     +o	 Nuvoton NCT6776
     +o	 Nuvoton NCT6102
     +o	 Nuvoton NCT6779
     +o	 Nuvoton NCT6791
     +o	 Nuvoton NCT6792

     Driver may	be forced to attach to unknown chips by	adding to
     /boot/device.hints: hint.wbwd.0.at="isa"

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 re-
	     lying 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>.

BSD				March 24, 2016				   BSD

NAME | SYNOPSIS | DESCRIPTION | SYSCTL VARIABLES | SEE ALSO | HISTORY | AUTHORS

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