How to Customize Yocto Linux for an Embedded Device

As embedded devices gain in power, numerous manufacturers are transitioning from standard operating systems to tailored Linux solutions to enhance performance, security, and hardware optimization.

Yocto Linux has emerged as one of the leading frameworks for the development of embedded products, as it enables engineers to design a fully customized Linux distribution that is optimized for specific hardware platforms.

From industrial control systems and smart displays to robotics and edge AI devices, Yocto empowers manufacturers to construct Linux systems that align precisely with their product specifications.

What Is Yocto Linux?

The Yocto Project is an open-source collaborative initiative that offers tools and templates for developing custom Linux operating systems tailored for embedded devices.

In contrast to conventional Linux distributions, Yocto does not deliver a pre-packaged operating system. Rather, it offers a build framework that allows developers to personalize:

• Linux kernel
• Bootloader
• Root filesystem
• System services
• Applications
• Hardware drivers
• Security configurations

This makes Yocto particularly suitable for products that necessitate long-term support and extensive hardware integration.

Reasons to Customize Yocto Linux for Embedded Devices

Standard Linux distributions are typically tailored for general-purpose computers. In contrast, embedded products often necessitate more specialized configurations.

Custom Yocto Linux offers several benefits, including:

Enhanced Hardware Performance

Developers have the ability to tailor the system to fit the specific hardware platform, eliminating superfluous components and enhancing:

• Boot speed
• Memory efficiency
• Processing performance
• System reliability

For instance, an industrial touchscreen terminal does not require the same software environment as a desktop computer.

Improved Hardware Integration

Embedded devices frequently incorporate custom components such as:

• Touchscreens
• Cameras
• Sensors
• GPIO interfaces
• Communication modules
• AI accelerators

Yocto enables developers to seamlessly integrate these hardware components into the Linux system.

Long-Term Product Support

Commercial embedded products typically necessitate a lifecycle of 5 to 10 years.

Through Yocto customization, manufacturers can ensure the following:

Fixed software versions
Security updates
Kernel modifications
– Application compatibility

This aspect is particularly crucial for industrial and commercial applications.

The Main Steps to Customize Yocto Linux

1. Select the Hardware Platform

The initial step involves selecting the embedded hardware platform.

Commonly utilized platforms consist of:

• ARM-based processors
• Rockchip processors
• NXP i.MX series
• Qualcomm platforms
• Intel embedded processors

For instance, Portworld embedded solutions are compatible with ARM platforms such as Rockchip processors, which include:

• RK3566
• RK3568
• RK3576
• RK3588

These platforms find extensive application in:

• Industrial computers
• Smart displays
• Robotics systems
• Edge AI devices

2. Set Up the Yocto Build Environment

Once the hardware has been selected, developers proceed to establish the Yocto development environment.

The primary components consist of:

Board Support Package (BSP)

The BSP includes files that are specific to the hardware, such as:

• Kernel configuration
• Device tree files
• Bootloader settings
• Hardware drivers
• Machine Configuration

The machine configuration specifies:

• CPU architecture
• Memory settings
• Storage configuration
• Hardware features

This configuration enables Yocto to produce images tailored for the designated device.

3. Tailor the Linux Kernel

The Linux kernel serves as the foundation of an embedded system.

Yocto provides developers with the capability to customize:

• Kernel version
• Driver support
• Hardware interfaces
• Power management
• Networking functions

For instance, a specialized industrial display might necessitate:

• Touchscreen driver
• Display controller support
• GPIO control
• USB device support
• Ethernet driver

Customizing the kernel guarantees that all hardware components function properly.

4. Incorporate Custom Applications and Software

Embedded devices typically operate with specialized applications.

Yocto enables developers to integrate:

• Tailored UI applications
• Industrial control software
• IoT communication services
• AI applications
• Device management tools

Applications can be introduced via custom Yocto recipes.

A recipe specifies:

• Location of source code
• Dependencies
• Instructions for building
• Rules for installation

5. Personalize the User Interface

For commercial products, the user interface is frequently tailored to align with the product’s intended use.

Common choices include:

• Qt-based interfaces
• Chromium kiosk mode
• Custom graphical applications
• Lightweight embedded GUIs

Illustrations include:

• Smart home control panels
• Digital signage interfaces
• Industrial HMI systems
• Self-service terminals

6. Establish System Security

Security is paramount for connected embedded devices.

Yocto facilitates the customization of:

• Secure boot
• Encryption
• Firewall configurations
• User permissions
• Remote update systems

This is particularly crucial for:

• Smart city devices
• Industrial equipment
• Commercial terminals

7. Construct and Deploy the Linux Image

Upon completion of the configuration, Yocto produces a tailored Linux image.

This image may encompass:

• Bootloader
• Linux kernel
• Root filesystem
• Applications
• Configuration files

The finalized image can subsequently be deployed via:

• SD card
• eMMC
• NAND storage
• OTA update systems

Yocto Linux Applications in Commercial Embedded Devices

The customized Yocto Linux is extensively utilized across various industries, including:

Industrial Automation

Illustrations:

• Machine control panels
• Factory monitoring systems
• Industrial HMIs

Smart Retail

Illustrations:

• Interactive displays
• Smart shelves
• Self-service terminals

Robotics

Illustrations:

• Robot controllers
• Vision systems
• Edge AI platforms

Smart Buildings

Illustrations:

• Access control terminals
• Building management panels
• Room scheduling systems

Yocto Linux vs Standard Linux Distribution

Feature	Yocto Linux	Standard Linux
Hardware customization	Excellent	Limited
System optimization	High	Medium
Embedded support	Excellent	General
Long-term maintenance	Strong	Depends
Development flexibility	Very high	Moderate

Portworld Embedded Linux Customization Services

Portworld offers tailored embedded solutions utilizing ARM platforms, catering to clients requiring Linux-based commercial and industrial products.

The services provided encompass:

• Yocto Linux customization
• Linux BSP development
• Kernel adaptation
• Driver development
• System optimization
• Hardware customization
• Embedded software integration

When combined with Portworld’s hardware platforms, including ARM-based motherboards and smart display solutions, clients can develop customized products for:

• Industrial control
• Digital signage
• Smart terminals
• Robotics

 AI edge devices

Customizing Yocto Linux for an embedded device enables manufacturers to develop a highly optimized operating system specifically designed for particular hardware and application needs.

From kernel customization and driver integration to application deployment and security optimization, Yocto offers the necessary flexibility for contemporary embedded products.