Hi. On 22.09.2016 20:32, Jean-Roch Blais wrote: > Hello Andrew, Erich ! >> Le 21 sept. 2016 à 04:52, Andrew <ni...@seti.kr.ua> a écrit : >> >> Most of boards have some kind of watchdog on board (in MIO or in south >> bridge), or some of them. For ex., iTCO_wdt for Intel, it87_wdt for ITE >> MIO, and so on. >> >> But built-in watchdog behavior may differ depending board model (it may >> reboot board, or it may just poweroff board, like ITE watchdog on old >> Asus K8N). >> >> Also, Intel watchdog driver is loaded automatically, MIO watchdog >> drivers are loaded manually (from command line or from /etc/modules). >> >> You can try it - load driver, and then do 'killall -9 watchdog' (to kill >> watchdog process & simulate system hangup). If board will be rebooted - >> all is OK. >> > Yes it does that indeed, I killed the watchdog0 and 1 plus the watchdog > processes and my system rebooted, the drivers are already loaded in BUC ( > lsmod gives iTCO_wdt ), no need to load anything, but it’s good to know how > it works. But my question still stands, there is no hardware lockup watchdog > timer, it has to be an external contraption which would detect an absence of > activity on the motherboard and activate the hardware reset button… I’ve seen > some wifi switches that do this for routers > (https://www.amazon.com/gp/product/B01BU2ALGO/ for exemple). It does not > ship to Canada though :-) !!! I’ve started some preliminary tests to perform > the same basic thing using an Arduino on one of BUC’s USB port, and it looks > promising… if you are interested I could let you know how it goes ! > bye ! You are wrong, iTCO_wdt is hardware watchdog timer. It doesn't use CPU for rebooting - this is separate circuit in the chipset. You may even try to disable reboot on kernel panic and initiate kernel panic, or even teke out one DIMM module - and system will be rebooted.
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