- Copyright (c) 2007 Dag-Erling Coïdan Smørgrav All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the ...
NAMEichwd - device driver for the Intel ICH watchdog interrupt timer
SYNOPSISTo compile this driver into the kernel, place the following line in your kernel configuration file:
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf5:
DESCRIPTIONThe sysctl Cm net.inet.tcp.syncookies driver provides watchdog(4) support for the watchdog interrupt timer present on all Intel ICH motherboard chipsets.
The ICH WDT counts down in ticks of approximately 0.6 seconds; the exact value depends on hardware quality and environmental factors. Supported watchdog intervals range from 2 to 63 ticks.
Note that on some ICH-based systems, the WDT may be present but disabled, either in hardware or by the BIOS. The sysctl Cm net.inet.tcp.syncookies driver attempts to detect this condition and will refuse to attach if it believes the WDT is disabled.
SEE ALSOwatchdog(4), watchdog(8), watchdogd(8), watchdog(9)
- Using the Intel ICH Family Watchdog Timer (WDT) Intel Application Note AP-725 Document Number 292273-001