Messages in this thread | | | Date | Wed, 3 May 2006 16:32:07 -0700 | From | "Randy.Dunlap" <> | Subject | Re: i8xx TCO timer: does not reset my machine |
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On Tue, 2 May 2006 00:59:48 +0200 Thomas Glanzmann wrote:
> Hello everyone, > I have an Intel board (D915GEV/D915GRF) with an onboard i8xx TCO timer > watchdog on it. I compiled a kernel and tried to make it reset my > machine, but it simply doesn't. I use Linus Linux tree (GIT HEAD), the > following watchdog related configuration: > > CONFIG_WATCHDOG=y > CONFIG_WATCHDOG_NOWAYOUT=y > CONFIG_I6300ESB_WDT=y > CONFIG_I8XX_TCO=y > > I tried to test the watchdog using the following: > > cat > /dev/watchdog
*** see below
> and wait a few minutes, but that doesn't reset my machine. dmesg shows the > following: > > (webfarm) [~] dmesg | grep TCO > i8xx TCO timer: heartbeat value must be 2<heartbeat<39, using 30 > i8xx TCO timer: initialized (0x0460). heartbeat=30 sec (nowayout=1) > > lspci is this: > [snip] > > Has somone any ideas, did I do something wrong? From looking at the > source code it looks like the watchdog is enabled as soon as I open the > device. And if I don't feed anything in, it shouldn't reload the timer.
TCO watchdog works on my old P-III machine. After writing to /dev/watchdog, about 50 (not 30) seconds later, it reboots.
Oh, I see. Two choices: use: echo -n 1 > /dev/watchdog or when you use: cat > /dev/watchdog and press CR, that doesn't close /dev/watchdog yet. You need to kill cat (^C) and then /dev/watchdog is closed and the watchdog timer starts counting. You will (should) see a message like so: i8xx TCO timer: Unexpected close, not stopping watchdog! then wait awhile, then it reboots.
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