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Diffstat (limited to '')
| -rw-r--r-- | Documentation/watchdog/wdt.rst (renamed from Documentation/watchdog/wdt.txt) | 31 |
1 files changed, 22 insertions, 9 deletions
diff --git a/Documentation/watchdog/wdt.txt b/Documentation/watchdog/wdt.rst index ed2f0b860869..d97b0361535b 100644 --- a/Documentation/watchdog/wdt.txt +++ b/Documentation/watchdog/wdt.rst @@ -1,11 +1,14 @@ +============================================================ +WDT Watchdog Timer Interfaces For The Linux Operating System +============================================================ + Last Reviewed: 10/05/2007 - WDT Watchdog Timer Interfaces For The Linux Operating System - Alan Cox <alan@lxorguk.ukuu.org.uk> +Alan Cox <alan@lxorguk.ukuu.org.uk> - ICS WDT501-P - ICS WDT501-P (no fan tachometer) - ICS WDT500-P + - 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 @@ -21,19 +24,26 @@ 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.: +pass IO address and IRQ boot parameters. E.g.:: + wdt.io=0x240 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) + build parameter) tachometer WDT501-P Fan Tachometer support (0=disable, default=0) type WDT501-P Card type (500 or 501, default=500) + =========== ====================================================== Features -------- - WDT501P WDT500P + +================ ======= ======= + WDT501P WDT500P +================ ======= ======= Reboot Timer X X External Reboot X X I/O Port Monitor o o @@ -42,9 +52,12 @@ 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 samples/watchdog/watchdog-simple.c +Example Watchdog Driver: + + see samples/watchdog/watchdog-simple.c |