Buildroot vs Yocto
The alternatives to Yocto, and what each build system optimizes for when choosing between them.
Why use Yocto?
There are several ways to put Linux on an embedded board.
For example, we could install:
- Debian
- Ubuntu
- Raspberry Pi OS
- Buildroot
- A vendor-provided Linux image
- A custom Linux distribution
So why use Yocto?
The biggest advantage is customization and reproducibility.
A Yocto build can describe almost every important part of the system.
We can control:
- Linux kernel
- Bootloader
- Device tree
- Kernel configuration
- Packages
- System services
- Filesystem configuration
- Network configuration
- Users
- Permissions
- Startup behavior
- Hardware-specific configuration
- Custom applications
This is particularly important for products that will be manufactured and deployed in large numbers.
Buildroot and Yocto side by side
Both build a customized Linux for an embedded board. They differ in how that customization is described, and therefore in how much framework you take on:
| Buildroot | Yocto | |
|---|---|---|
| Configuration model | One build-system definition per project, driven by makefiles | Layered metadata interpreted by BitBake, one layer per concern |
| Learning curve | Low: configure, build, boot | Higher: recipes, layers, classes, tasks and appends |
| Package management | Deliberately minimal, no package manager by default | Full package management, and runtime package installs are possible |
| Adding your own code | A patch, or a small in-tree package | A recipe in your own layer, plus a .bbappend for a vendor recipe |
| Board support | Configuration for supported boards ships with the tool | Supplied by vendor and community BSP layers |
| Typical fit | Small, well-understood systems maintained by one team | Products that need control, several boards, or a maintained BSP relationship |
Both end with a root filesystem, a kernel and a bootloader for the target. The practical question is how much the system will change after the first build: a project that stays small and stable is often simpler to manage with Buildroot, while a product with multiple boards, long support life and custom hardware is usually better served by the layer model.