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WBWD(4) 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 lines in your kernel configuration file: device superio 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: * Winbond 83627HF/F/HG/G * Winbond 83627S * Winbond 83697HF * Winbond 83697UG * Winbond 83637HF * Winbond 83627THF * Winbond 83687THF * Winbond 83627EHF * Winbond 83627DHG * Winbond 83627UHG * Winbond 83667HG * Winbond 83627DHG-P * Winbond 83667HG-B * Nuvoton NCT6775 * Nuvoton NCT6776 * Nuvoton NCT6102 * Nuvoton NCT6779 * Nuvoton NCT6791 * Nuvoton NCT6792 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 particu- larly 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 watch- dog(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 watch- dog(9) to the kernel message buffer for debugging. dev.wbwd.0.debug This read-only value gives the state of some registers on last up- date. The wbwd driver also provides further sysctl options that are hidden by de- fault. See the source code for more information. SEE ALSO superio(4), watchdog(4), device.hints(5), watchdog(8), watchdogd(8), watch- dog(9) HISTORY The wbwd driver first appeared in FreeBSD 10.0. AUTHORS This manual page was written by Bjoern A. Zeeb <bz@FreeBSD.org>. FreeBSD ports 15.quarterly October 16, 2019 WBWD(4)
NAME | SYNOPSIS | DESCRIPTION | SYSCTL VARIABLES | SEE ALSO | HISTORY | AUTHORS
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