Application Notes | NXP iMX 93 Development Board OTA Function Construction

1. Overview

Over-the-Air Technology (OTA) is a technology that remotely manages mobile terminal devices and SIM card data through the air interface of mobile communications. This article uses swupdate to perform OTA upgrades. Swupdate is an upgrade service framework program based on the embedded Linux platform. It provides partition upgrade, file upgrade, differential upgrade (patch application) functions, and provides an open interface for users to add custom upgrade processing functions. This application note mainly describes how to use the OTA function built in the Mir system based on the NXP iMX 93 core board (MYC-LMX9X core board) to achieve remote upgrades of the MYC-LMX9X file system.

2. Environmental Preparation

2.1. Software Resources

• OTA upgrade file creation tool: ota-generate_swu.tar.gz (path: 03_Tools/ota-tools).

• MYC-LMX9X-Core file system: myir-image-core-myd-lmx9x.ext4 (path: 02_Images/ or compiled through Yocto. For compilation-related information, see the Software Development Guide).

• Ubuntu operating system host environment, either a virtual machine or a PC host with Ubuntu installed, no version requirements.

2.2. Hardware resources

• Mir is based on the NXP iMX 93 development board (or MYC-LMX9X core board + self-developed baseboard, the self-developed baseboard requires at least one network port or a Wifi chip).

• Network cable or Wi-Fi antenna.

• Development board power supply, serial port cable and other accessories required to ensure the development board can run normally and start up.

2.3. Host environment configuration

To perform OTA upgrade, you must build an Http server in the Ubuntu host environment. The following will take the Http server construction process of Ubuntu18.04 as an example, and the username will be myir. For subsequent OTA upgrades, the Http server will be directly configured to be directly usable in the future. This process is for reference only. If any errors that are not described in the following instructions occur during the construction process using other versions of the Ubuntu system, please consult the Internet for solutions.

• Install apache2

  sudo apt install -y apache2

• Configure the environment

  The default port is 80. To prevent conflicts caused by other uses, change it to a custom port: 8001. Modify the listening port in the /etc/apache2/ports.conf file:

  $: vi /etc/apache2/ports.conf

  Listen 8001 ## Other lines remain unchanged

  Modify the port and access directory of the /etc/apache2/sites-enabled/000-default.conf file for subsequent use.

  $: vi /etc/apache2/sites-enabled/000-default.conf

  ## Other lines remain unchanged

  #DocumentRoot /var/www/html ## Default browser access directory, comment out

  DocumentRoot /home/myir/swupdate ##Change to this directory, please modify the user name according to the modification

  Modify the apache2 configuration file /etc/apache2/apache2.conf:

$: vi /etc/apache2/apache2.conf

##Find the following line and modify it to the following content

# ##Configure the default directory, comment out

Options Indexes FollowSymLinks

AllowOverride None

Require all granted

• Restart the service

  $: sudo /etc/init.d/apache2 restart

• test

  If it is a virtual machine, please modify the Ubuntu network configuration to a bridged network card so that the virtual machine and the Windows host are under the same IP. If it is another environment, you can directly open the browser and enter http://{hostIP}:8001 in the browser. Here, hostIP is the IP address of Ubuntu configured with the http server. For example, if the IP address of Ubuntu is 192.168.1.20, enter in the browser: