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-Last Reviewed: 10/05/2007
- WDT Watchdog Timer Interfaces For The Linux Operating System
- Alan Cox <>
- ICS WDT501-P
- ICS WDT501-P (no fan tachometer)
- ICS WDT500-P
-All the interfaces provide /dev/watchdog, which when open must be written
-to within a timeout or the machine will reboot. Each write delays the reboot
-time another timeout. In the case of the software watchdog the ability to
-reboot will depend on the state of the machines and interrupts. The hardware
-boards physically pull the machine down off their own onboard timers and
-will reboot from almost anything.
-A second temperature monitoring interface is available on the WDT501P cards.
-This provides /dev/temperature. This is the machine internal temperature in
-degrees Fahrenheit. Each read returns a single byte giving the temperature.
-The third interface logs kernel messages on additional alert events.
-The ICS ISA-bus wdt card cannot be safely probed for. Instead you need to
-pass IO address and IRQ boot parameters. E.g.:
- wdt.irq=11
-Other "wdt" driver parameters are:
- heartbeat Watchdog heartbeat in seconds (default 60)
- nowayout Watchdog cannot be stopped once started (kernel
- build parameter)
- tachometer WDT501-P Fan Tachometer support (0=disable, default=0)
- type WDT501-P Card type (500 or 501, default=500)
- WDT501P WDT500P
-Reboot Timer X X
-External Reboot X X
-I/O Port Monitor o o
-Temperature X o
-Fan Speed X o
-Power Under X o
-Power Over X o
-Overheat X o
-The external event interfaces on the WDT boards are not currently supported.
-Minor numbers are however allocated for it.
-Example Watchdog Driver: see Documentation/watchdog/src/watchdog-simple.c