Hello Andrew, > Le 22 sept. 2016 à 13:53, Andrew <ni...@seti.kr.ua> a écrit : > > 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.
Ok I gladly agree to this, since this means there is no need to devise an external watchdog timer, right ? There is a lot of people who don’t know that then… :-( My previous motherboard would not reboot when it hanged, this is why I thought there was no hardware wdt, but it might be that the wdt on this mobo only shuts down the mobo like you said before. ( it is a Foxconn 661MXPlus [img]http://i.imgur.com/38JiUW9.jpg[/img] and the SIS900 onboard nic was now and then sending me warning messages… ) So depending on the mobo, the wdt can reboot or shutdown the mobo, do you know any way to choose which ??? thanks again ! jrb ------------------------------------------------------------------------------ ------------------------------------------------------------------------ leaf-user mailing list: leaf-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/leaf-user Support Request -- http://leaf-project.org/
