Differences

This shows you the differences between two versions of the page.

--- en:c1_watchdog_timer [2015/10/30 13:47]
odroid created
+++ en:c1_watchdog_timer [2015/11/24 12:00] (current)
moon.linux [Test Watchdog module]
@@ Line 1: / Line 1: @@
-Template
+=========Watchdog on Linux/Ubuntu=======
+===== Background =====
+Watchdog timers are commonly found in embedded systems and other computer-controlled equipment where humans cannot easily access the equipment or would be unable to react to faults in a timely manner. In such systems, the computer cannot depend on a human to reboot it if it hangs; it must be self-reliant.
+Odroid C1/C1+ support watchdog driver **aml_wdt** to control the PMU.
+===== Test Watchdog module =====
+<WRAP center round important 100%>
+Watchdog driver aml_wdt is configurable for Odroid C1/C1+.
+</WRAP>
+You should be able to see /dev/watchdog and /dev/watchdog0 device files being created.
+<code>
+odroid@odroid:~$ ls -la /dev/watchdog*
+crw------- 1 root root  10, 130 Oct 30 17:28 /dev/watchdog
+crw------- 1 root root 250,   0 Oct 30 17:28 /dev/watchdog0
+odroid@odroid:~$
+</code>
+Watchdog daemon will trigger and reboot if we access the device file manually.
+<code>
+# cat /dev/watchdog
+[ 7639.726211] watchdog watchdog0: watchdog did not stop!
+</code>
+To manually stop watchdog to reboot.
+<code>
+# echo V > /dev/watchdog
+</code>
+===== Install Watchdog daemon =====
+To install watchdog daemon
+<code>
+sudo apt-get install watchdog
+</code>
+Create dir for watchdog logs files
+<code>
+sudo mkdir -p /var/log/watchdog
+</code>
+===== Watchdog demon configuration files =====
+You need to edit the **/etc/watchdog.conf** file to un-comment and so actually use the **/dev/watchdog** device access to the module. Otherwise the watchdog will not use the hardware and rely only on its internal code to soft-reboot a broken machine.
+<code>
+$ cat /etc/watchdog.conf
+#ping                   = 172.31.14.1
+#ping                   = 172.26.1.255
+#interface              = eth0
+#file                   = /var/log/messages
+#change                 = 1407
+# Uncomment to enable test. Setting one of these values to '0' disables it.
+# These values will hopefully never reboot your machine during normal use
+# (if your machine is really hung, the loadavg will go much higher than 25)
+#max-load-1             = 24
+#max-load-5             = 18
+#max-load-15            = 12
+# Note that this is the number of pages!
+# To get the real size, check how large the pagesize is on your machine.
+#min-memory             = 1
+#repair-binary          = /usr/sbin/repair
+#repair-timeout         =
+#test-binary            =
+#test-timeout           =
+watchdog-device = /dev/watchdog
+# Defaults compiled into the binary
+#temperature-device     =
+#max-temperature        = 120
+# Defaults compiled into the binary
+admin                   = root
+interval                = 1
+logtick                = 1
+log-dir         = /var/log/watchdog
+# This greatly decreases the chance that watchdog won't be scheduled before
+# your machine is really loaded
+realtime                = yes
+priority                = 1
+# Check if rsyslogd is still running by enabling the following line
+pidfile         = /var/run/rsyslogd.pid
+# set watchdog timer
+watchdog-timeout        = 15
+</code>
+For more configuration please follow link below.
+[[http://www.sat.dundee.ac.uk/psc/watchdog/watchdog-configure.html]]
+===== Start Watchdog Service and Verify ======
+<code>
+root@odroid:~# service watchdog status
+ * watchdog is running
+root@odroid:~#
+</code>
+Once the watchdog demon is configures then it tries to continuously try to reset the watchdog timer.
+Another way to test watchdog device is working under watchdog demon.
+<code>
+root@odroid:~#
+root@odroid:~# pkill -9 watchdog
+root@odroid:~# [ 2452.972630@0] watchdog watchdog0: watchdog did not stop!
+    QA5:A;SVN:B72;POC:17F;STS:0;BOOT:0;INIT:10;BOOT:1;INIT:0;READ:0;CHECK:0;PASS:1;
+    ----------------------------------------------------------------------
+    Welcome to Hardkernel's ODROID-C... (Built at 19:33:00 Dec 8 2014) *
+    ----------------------------------------------------------------------
+    CPU : AMLogic S805
+    MEM : 1024MB (DDR3@792MHz)
+    BID : HKC1310001
+    S/N : HKC11122F37DF492
+x0000009f
+    check SD_boot_type:0x1 card_type:0x1
+    Loading U-boot...success.
+</code>