On 2016年01月22日 06:58, Randy MacLeod wrote:
On 2016-01-19 09:01 PM, [email protected] wrote:
1. inherit systemd, and add two unit files which are from Fedora 23
Fine.
2. auto load soft dog kernel module
I haven't used a hardware watchdog for a while. Does softdog
abstract that away so that it's hidden by the BSP? If not,
can a user ditch the softdog for a hardware watchdog? Does that
over-ride process need to be documented?
Usually, watchdog timers are implemented as add-on cards, or as on-chip
peripherals within microcontrollers. But if there is no hardware watchdog,
the Linux kernel can provide a software watchdog implemented using kernel
timers.
https://en.wikibooks.org/wiki/The_Linux_Kernel/Softdog_Driver
if the machine has the hardware watchdog, and drivers are compiled in,
the /dev/watchdog will be generated; softdog is /dev/watchdog1 or
/dev/watchdog2, and the watchdog daemon will use the hardware watchdog
if drivers are compiled as module, udev will auto load it, but udev
will be run after systemd-modules-load.service, and softdog will be
used
--
Best Reagrds,
Roy | RongQing Li
--
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