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diff --git a/Documentation/watchdog/watchdog.txt b/Documentation/watchdog/watchdog.txt deleted file mode 100644 index 4b1ff69cc19a..000000000000 --- a/Documentation/watchdog/watchdog.txt +++ /dev/null @@ -1,94 +0,0 @@ - Watchdog Timer Interfaces For The Linux Operating System - - Alan Cox <alan@lxorguk.ukuu.org.uk> - - Custom Linux Driver And Program Development - - -The following watchdog drivers are currently implemented: - - ICS WDT501-P - ICS WDT501-P (no fan tachometer) - ICS WDT500-P - Software Only - SA1100 Internal Watchdog - Berkshire Products PC Watchdog Revision A & C (by Ken Hollis) - - -All six 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 -and some Berkshire 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. - -Both software and hardware watchdog drivers are available in the standard -kernel. If you are using the software watchdog, you probably also want -to use "panic=60" as a boot argument as well. - -The wdt card cannot be safely probed for. Instead you need to pass -wdt=ioaddr,irq as a boot parameter - eg "wdt=0x240,11". - -The SA1100 watchdog module can be configured with the "sa1100_margin" -commandline argument which specifies timeout value in seconds. - -The i810 TCO watchdog modules can be configured with the "i810_margin" -commandline argument which specifies the counter initial value. The counter -is decremented every 0.6 seconds and default to 50 (30 seconds). Values can -range between 3 and 63. - -The i810 TCO watchdog driver also implements the WDIOC_GETSTATUS and -WDIOC_GETBOOTSTATUS ioctl()s. WDIOC_GETSTATUS returns the actual counter value -and WDIOC_GETBOOTSTATUS returns the value of TCO2 Status Register (see Intel's -documentation for the 82801AA and 82801AB datasheet). - -Features --------- - WDT501P WDT500P Software Berkshire i810 TCO SA1100WD -Reboot Timer X X X X X X -External Reboot X X o o o X -I/O Port Monitor o o o X o o -Temperature X o o X o o -Fan Speed X o o o o o -Power Under X o o o o o -Power Over X o o o o o -Overheat X o o o o 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 - - -Contact Information - -People keep asking about the WDT watchdog timer hardware: The phone contacts -for Industrial Computer Source are: - -Industrial Computer Source -http://www.indcompsrc.com -ICS Advent, San Diego -6260 Sequence Dr. -San Diego, CA 92121-4371 -Phone (858) 677-0877 -FAX: (858) 677-0895 -> -ICS Advent Europe, UK -Oving Road -Chichester, -West Sussex, -PO19 4ET, UK -Phone: 00.44.1243.533900 - - -and please mention Linux when enquiring. - -For full information about the PCWD cards see the pcwd-watchdog.txt document. |
