emWEB-15WT (
Hardware and Software Manual
)
•
Operating System and Drivers
5 - 15
Rev. 1.1
© Janz Tec AG
5
Operating System and Drivers
When you order the emWEB-15WT with pre-installed software (Debian 8 operating system), then our
default Janz Tec image is pre-installed on the µSD-card and the emWEB-15WT driver package is
already installed and fully configured.
5.1
Janz Tec AG Linux Image for emWEB-15WT
Our pre-installed Janz Tec AG Image contains the combination of the official Debain operating system
as well as our emWEB-15WT drivers. File /root/imageversion.txt contains the image name and version
of the installed Janz Tec image.
You can change the emWEB-15WT configuration on accessing the local hosted website at
The local running web service
is named “webmin” (
) and gives through a web
interface access to different configuration features on the emWEB-15WT. Please refer to chapter 5.2.2
Webmin Configuration Webserver Webmin Configuration Webserver for further configuration
information.
An additional Janz Tec image feature is a write protected root filesystem. The AUFS filesystem is
integrated to the custom kernel and enabled in the Debian 8 distribution. For further usage
instructions, please have a look at chapter 5.1.3 Overlay filesystem (AUFS).
5.1.1
Default configurations
The emWEB-15WT is delivered with an enabled ssh service. During the first start, the SSH keys will
be created. Following the log in credentials are listed, but please note, that the access for the “root”
user is denied for SSH connections.
Default log in credentials:
Username:
dev
Password: dev1
Username:
root
Password: root1
5.1.2
Disk Partitioning information
Depending on the installed µSD card, the drive has 3 partitions:
-
/dev/mmcblk0p1: Boot Partition (not mounted)
-
/dev/mmcblk0p2: Linux System Partition (write-protected)
-
/dev/mmcblk0p3: Data Partition (read-write)
o
mounted to /data/
→
use this partition for user data
5.1.3
Overlay filesystem (AUFS)
Note: The overlay filesystem is default enabled on your system. This prevents data loss on the local
system partition.
In the case of the enabled filesystem protection, all data written to the “Linux System Partition”
(/dev/mmcblk0p2) will be lost during the next restart of the system. The /data folder can be used to
save user specific data. Use the following commands to configure the behaviour of the overlay
filesystem:
