Compare Yocto and Buildroot — when would you choose each?

Buildroot is a simple, Makefile-based build system that generates a complete embedded Linux image (toolchain, kernel, bootloader, and rootfs) from source. It prioritizes simplicity and fast builds. Configuration is a single .config file managed through make menuconfig. A typical Buildroot image builds in 15-30 minutes on a modern machine. Buildroot produces a monolithic image — if you change one package, you rebuild the entire rootfs.

Yocto (via the OpenEmbedded build framework and BitBake) is a far more powerful and complex system. It uses a layered architecture of recipes (.bb files), classes, and configuration files. Yocto builds individual packages (.ipk, .deb, or .rpm), supports incremental builds (changing one package rebuilds only that package and its dependents), generates an SDK for application developers, and supports multiple image variants from the same configuration. A first Yocto build can take 1-4 hours and requires 50+ GB of disk space.

Choose Buildroot when: your team is small, the product is simple (single application, few packages), you want fast iteration, and you do not need a package manager on the target. Buildroot has a gentle learning curve and is excellent for products like IP cameras, IoT sensors, or industrial controllers. Choose Yocto when: you need long-term maintenance (Yocto's layered structure makes it easier to track upstream updates), your product requires multiple image variants, you have a large team where application developers need an SDK, you need a package manager for field updates, or your SoC vendor provides a Yocto BSP layer (most do — NXP, TI, STMicro, Qualcomm). Most commercial embedded Linux products use Yocto because its upfront complexity pays off over a multi-year product lifecycle.