Buildroot builds a cross-compiler, a Linux kernel and a complete root filesystem from source, driven by one Kconfig-style configuration file. Starting from the qemu_arm_vexpress_defconfig that ships with Buildroot 2026. 05.
Source: [Dev.to](https://dev.to/raghu_bharadwaj_404e60eb0c/buildroot-for-embedded-linux-part-1-your-first-buildroot-root-filesystem-2m9g)