diff options
author | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 12:17:53 -0700 |
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committer | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 15:44:42 -0700 |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/Documentation/watchdog/wdt.txt | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/Documentation/watchdog/wdt.txt')
-rw-r--r-- | kernel/Documentation/watchdog/wdt.txt | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/kernel/Documentation/watchdog/wdt.txt b/kernel/Documentation/watchdog/wdt.txt new file mode 100644 index 000000000..061c2e353 --- /dev/null +++ b/kernel/Documentation/watchdog/wdt.txt @@ -0,0 +1,50 @@ +Last Reviewed: 10/05/2007 + + WDT Watchdog Timer Interfaces For The Linux Operating System + Alan Cox <alan@lxorguk.ukuu.org.uk> + + 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.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) + tachometer WDT501-P Fan Tachometer support (0=disable, default=0) + type WDT501-P Card type (500 or 501, default=500) + +Features +-------- + 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 |