Users Guide

If TPM is turned off, the device node (/dev/tpm0) does not exist.

(plano)ubuntu@localhost:~$ ls /dev/tpm0

ls: cannot access /dev/tpm0: No such file or directory

If TPM is turned on, the device node (/dev/tpm0) exists.

(plano)ubuntu@localhost:~$ ls /dev/tpm0

/dev/tpm0

Watchdog Timer (WDT)

NOTE: For more information about Watchdog Timer (WDT) commands, see www.sat.dundee.ac.uk/~psc/watchdog/Linux-

Watchdog.html.

Dell recommends that you enable the WDT by default to activate the fail-safe circuitry. Snappy, a WDT-compatible operating

system, provides the capability to detect and recover the system from malfunctions or unexpected crashes.

To check daemon status, run the command:

admin@localhost:$ systemctl show | grep –i watchdog

Returns:

RuntimeWatchdogUSec=1min

ShutdownWatchdogUSec=10min

NOTE: The default value is 10. The actual value should be greater than 0.

To configure WDT, run the command:

admin@localhost:$ sudo vi /etc/systemd/system.conf.d/watchdog.conf

Cloud LED On/Off

1. To export Cloud LED PIN, run the command:

#sudo su –

#echo 346 > /sys/class/gpio/export

#echo out > /sys/class/gpio/gpio346/direction

2. To turn on Cloud LED, run the command:

#echo 1 > /sys/class/gpio/gpio346/value

To turn off Cloud LED, run the command:

#echo 0 > /sys/class/gpio/gpio346/value

Global Positioning Systems (GPS)

NOTE: For more information about GPS configurations, see http://locationd.readthedocs.io/en/latest/intro.html.

National Marine Electronics Association (NMEA) data is supported if the GPS module is present in the system. In the operating

system, the location service is a central hub for multiplexing access to positioning subsystems available through hardware and

software. It provides a client API offering positioning capabilities to applications and other system components..

Setting up the operating system