Hi Fabio, > Hi, on some machines I'm trying to setup iTCO wdt (ivybridge/panther > point), but I'm perplexed about the presence of three devices: > > > kefk dev # ls -la wat* > crw------- 1 root root 10, 130 4 ago 22.21 watchdog > crw------- 1 root root 251, 0 4 ago 22.21 watchdog0 > crw------- 1 root root 251, 1 4 ago 22.21 watchdog1 > > > I was expecting only one, so I'm a bit confused about the difference > between the devices and how to use it. I googled a bit without big > success... maybe you could point me to some documentation? > I checked also sources and kernel Documentation/, still no clues :) with the introduction of the watchdog generic framework we allowed more then 1 watchdog device. So you have watchdog0 till watchdog... . In your case you have 2 devices that were detected: watchdog0 and watchdog1. (for instance a iTCO device and a Super-I/O watchdog device). for compatibility /dev/watchdog0 is the same as /dev/watchdog. We indeed have real documentation about it, but the ideas are in Documentation/watchdog/watchdog-kernel-api.txt (See the part: It contains following fields: * id: set by watchdog_register_device, id 0 is special. It has both a /dev/watchdog0 cdev (dynamic major, minor 0) as well as the old /dev/watchdog miscdev. The id is set automatically when calling watchdog_register_device. Kind regards, Wim. -- To unsubscribe from this list: send the line "unsubscribe linux-watchdog" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
