What Is Embedded Linux?

Embedded Linux is the use of the Linux kernel and a carefully chosen set of software to run a dedicated device. The device has one job, such as controlling a machine, routing data from a site, recording cameras or running AI inference, and the operating system exists to support that job rather than a person at a desktop.

It is the same Linux kernel used on servers and PCs. What changes is the way it is put together. An embedded Linux image is built for one specific board and processor, usually cross-compiled on a separate build machine, stripped of anything the device does not need and configured to start its application at power-on. There may be no screen, keyboard or login prompt at all.

Linux suits embedded work because it is free of licence fees, supports almost every processor and peripheral, has mature networking and security, and has a large pool of developers. That combination has made it the default operating system for connected devices, from routers and televisions to industrial controllers, vehicles and edge AI computers.

Every embedded Linux image, whoever builds it, is made from the same layers. On a PC the firmware discovers the hardware. On most embedded boards the software has to be told what is there.

There is no single embedded Linux distribution. Teams either start from a ready-made distribution and trim it, or build a custom one from source. Each approach trades development speed against control over the final image.

Many projects use two approaches over their life: a general distribution during development, when packages can be added freely, then a custom build for production, when every device must run an identical, auditable image.

A real-time operating system (RTOS) such as FreeRTOS or Zephyr runs on microcontrollers with kilobytes to a few megabytes of memory and guarantees a response within a fixed time. Embedded Linux needs a processor with memory management hardware (an MMU) and typically tens of megabytes of memory or more, but it brings networking, filesystems, security updates, graphics and AI frameworks that an RTOS does not.

The gap has narrowed. The PREEMPT_RT patches, which make Linux far more predictable under load, became part of the mainline kernel in version 6.12, so soft and many firm real-time tasks now run well on Linux. Hard real-time control is still often handed to a microcontroller, or to a separate real-time core on the same chip: many NXP i.MX processors pair Linux on Cortex-A cores with an RTOS on a Cortex-M core.

Embedded Linux runs on x86 industrial PCs, but most purpose-built boards use Arm processors, with RISC-V appearing in newer designs. Our guide to x86 vs Arm for industrial and embedded systems covers how to choose. On the board side, our Linux single board computers span both architectures, and NXP i.MX SBCs are a common choice where long availability matters. Complete systems follow the same pattern: the BCO-500 series includes a Rockchip RK3568J build that runs Debian, Ubuntu or Android, and NVIDIA Jetson computers run Jetson Linux, NVIDIA’s Ubuntu-based embedded distribution.

Lifecycle planning matters as much as the first build. Mainline Linux long-term kernels are now maintained for around two years, which is shorter than most industrial products stay in service. Projects that need longer usually follow a vendor or commercial kernel, or the Civil Infrastructure Platform, a Linux Foundation project that maintains selected kernels for 10 years or more. Whatever the route, plan how security fixes will reach the devices before the first one ships.

We supply our single board computers and industrial systems configured and imaged as standard, with the Linux distribution, kernel version and drivers your application is validated against.