META-IOT2050

This Isar layer contains recipes, configuration and other artifacts that are specific to Debian-based IOT2050 product.

Build example image

Before building the system, you will need to install docker on build host. For example under Debian Linux

sudo apt install docker.io

Then open the menu to select the desired image and options:

./kas-container menu

After the build completed, the final image is under

build/tmp/deploy/images/iot2050/iot2050-image-example-iot2050-debian-iot2050.wic.img

Build user SDK

Note: Current SDK only supports Linux x86-64 host machine

./kas-container build kas-iot2050-example.yml:kas/opt/sdk.yml

(or select SDK in kas menu)

After the build completed, the SDK tarball is located at

build/tmp/deploy/images/iot2050/sdk-isar-arm64.tar.xz

Please follow the further instruction file README.sdk in the SDK tarball.

The SDK is also available as docker image. To import it into a docker host, run

docker load -i build/tmp/deploy/images/iot2050/sdk-iot2050-debian-arm64-docker-archive.tar.xz

Clean build result

./kas-container --isar clean

Booting the image from SD card

Under Linux, insert an unused SD card. Assuming the SD card takes device /dev/mmcblk0, use dd to copy the image to it. For example:

$ sudo dd if=build/tmp/deploy/images/iot2050/iot2050-image-example-iot2050-debian-iot2050.wic.img \
          of=/dev/mmcblk0 bs=4M oflag=sync

Alternatively, install the bmap-tools package and run the following command which is generally faster and safer:

$ sudo bmaptool copy build/tmp/deploy/images/iot2050/iot2050-image-example-iot2050-debian-iot2050.wic.img /dev/mmcblk0

The example image starts with the IP 192.168.200.1 preconfigured on the first Ethernet interface, and use DHCP at another. You can use ssh to connect to the system.

The BSP image does not configure the network. If you want to ssh into the system, you can use the root terminal via UART to ifconfig the IP address and use that to ssh in.

NOTE: To login, the default username and password is root. And you are required to change the default password when first login.

Installing the image on the eMMC (IOT2050 Advanced only)

During the very first boot of the image from an SD card or USB stick, you can request the installation to the eMMC. For that, press the USER button while the status LED is blinking orange during that first boot. Hold the button for at least 5 seconds to start the installation.

NOTE: All content of the eMMC will be overwritten by this procedure!

The ongoing installation is signaled by a fast blinking status LED. Wait for several minutes until the LED stops blinking and the device reboots to the eMMC. You can safely remove the SD card or USB stick at that point.

The installation can also be triggered automatically by creating the file /etc/install-on-emmc on the vanilla image by mounting it under Linux and executing, e.g., touch <mountpoint>/etc/install-on-emmc.

Selecting a boot device

By default, the boot loader will pick the first bootable device. If that device may no longer fully start, you can select an alternative boot device in the U-Boot shell. Attach a USB-UART adapter to X14, connect it to a host PC and open a terminal program on that port. Reset the device and interrupt the boot when it counts down ("Hit any key to stop autoboot"). Then type

=> setenv boot_targets mmc0
=> run distro_bootcmd

to boot from the microSD card. Use usb0 for the first USB mass storage device.

NOTE: This selection is not persistent. The boot loader will fall back to its default boot order after reset.

Building with SWUpdate support

It is possible to create an image with a SWUpdate based double copy root file system for Over-The-Air updates by selecting the option Example image with SWUpdate support during the image configuration with ./kas-container menu. You can also build the image by calling:

./kas-container build kas-iot2050-example.yml:kas/opt/swupdate-example.yml

You can find the final image under build/tmp/deploy/images/iot2050/iot2050-image-swu-example-iot2050-debian-iot2050.wic.img. This image holds the necessary partition layout with two root file systems. The image iot2050-image-swu-example-iot2050-debian-iot2050.wic.img can be flashed directly to a SD card as described in section Booting the image from SD card.

NOTE: As the image contains 2 root file systems, it has a size of 7 Gigabytes.

It also will create a binary for updating the system at build/tmp/deploy/images/iot2050/iot2050-image-swu-example-iot2050-debian-iot2050.swu

Update an image with SWUpdate

The following steps are necessary to update an image created with SWUpdate support.

1. Transfer the SWUpdate binary iot2050-image-swu-example-iot2050-debian-iot2050.swu to the target system.
2. Update the system with SWUpdate by executing:

$ swupdate -i iot2050-image-swu-example-iot2050-debian-iot2050.swu

You can find more details and options for the command swupdate in the SWUpdate documentation.

NOTE: The used SWUpdate package does not contain a web-app example.

SWUpdate will write the image to the unused root partition and sets the necessary U-Boot variables.

3. Reboot the system into the new root file system. The switch between the root file systems occurs automatically and requires no user interaction.

4. Confirm that the new root file system is correctly booted.

After a reboot, the device boots into the new root file system. If the boot is successful the update process needs to be completed by calling:

$ complete_update.sh success

The script sets the update state in the U-Boot environment to the initial state.

If the update is deemed failed, resetting the device will select the previous root file system. Afterwards the failed update is confirmed by calling:

$ complete_update.sh failed

This call reverts the U-Boot environment to the initial state. After which you have to manually reboot in order to be effective.

U-Boot environment

The bootloader environment needs to be adapted to select the correct root file system during boot. This adaptation occurs automatically during the first boot by executing the patch-u-boot-env.service. This systemd-service writes the necessary variables (ustate, sysselect) to the U-Boot environment. After writing the U-Boot environment, an update with SWUpdate is possible.

Revert to the default environment

If it is necessary to revert to the default U-Boot environment the following command can be used:

$ fw_setenv -f /etc/u-boot-initial-env