original recipent's server bounced it back :( --------- Forwarded message --------- From: Arpi <arpi at thot.banki.hu> To: mkn at teraport.de Subject: ls_sensors, fscscy.o & watchdog Hi, I've spent few hours experiencing with the watchdog feature of the Fujitsu Siemens server board (don't ask the model name, what i know is that it uses serverworks CSB5 chipset) using lm_sensors 2.7.0's fscscy driver. (I needed it because i have random hangup (once a week, so hard to debug...) on a server). Ok, so there is /proc/sys/dev/sensors/fscscy-i2c-0-73/wdog, containing 3 0..255 values for the 3 watchdog registers. The first one is the time counter, it counts backwards (seems write-only, at least you can't read the current counter back). It's in 2 seconds base, so writting 30 there means 60 seconds delay. It seems whole 0..255 range is supported, so up to 510 seconds. writting 0 means immediate hardware reset. The second number is unknown to me, it doesn't matter what value i put there. The third is the control register, with flags 16, 32 and 128. If i write only 16 or 144 (128+16), it means system reset when the counter reaches 0. If i OR 32, it has no effect. So, the world's simples watchdog using this mainboard: while true ; do echo 30 0 16 > /proc/sys/dev/sensors/fscscy-i2c-0-73/wdog sleep 10 done it does hardware reset after 1 minutes, if this script is killed or system hangup occurs. Also note, that BIOS has a strange setting, named OS Boot Retry Count, set to 0 by default, it changes watchdog behaviour to power off instead of reset. (0=poweroff 1..7=reset). It took me a while to find this... Please add the above to the documentation (doc/chips/fscscy), so i can save a few hours of resetting for other people :) A'rpi / Astral & ESP-team -- Developer of MPlayer G2, the Movie Framework for all - http://www.MPlayerHQ.hu
