Documentation/watchdog/hpwdt.rst

2 HPE iLO NMI Watchdog Driver
11  The HPE iLO NMI Watchdog driver is a kernel module that provides basic
12  watchdog functionality and handler for the iLO "Generate NMI to System"
18  Watchdog functionality is enabled like any other common watchdog driver. That
19  is, an application needs to be started that kicks off the watchdog timer. A
20  basic application exists in tools/testing/selftests/watchdog/ named
21  watchdog-test.c. Simply compile the C file and kick it off. If the system
22  gets into a bad state and hangs, the HPE ProLiant iLO timer register will
29  soft_margin   allows the user to set the watchdog timer value.
32  pretimeout    allows the user to set the watchdog pretimeout value.
37  nowayout      basic watchdog parameter that does not allow the timer to
40                to "Y", then there is no way of disabling the watchdog once
43                before calling panic. (-1) disables the watchdog.  When value
44                is > 0, the timer is reprogrammed with the greater of
49        More information about watchdog drivers in general, including the ioctl
50        interface to /dev/watchdog can be found in
51        Documentation/watchdog/watchdog-api.rst and Documentation/driver-api/ipmi.rst
55  non-zero values will be rounded, possibly to zero.  Users should verify
63  and loop forever.  This is generally not what a watchdog user wants.
66 	- Documentation/admin-guide/kdump/kdump.rst
67 	- Documentation/admin-guide/kernel-parameters.txt (panic=)
68 	- Your Linux Distribution specific documentation.
70  If the hpwdt does not receive the NMI associated with an expiring timer,
71  the iLO will proceed to reset the system at timeout if the timer hasn't
74 --
76  The HPE iLO NMI Watchdog Driver and documentation were originally developed