Buildroot is a tool that simplifies and automates the process of building a complete Linux system for embedded systems using cross-compilation.
To achieve this, Buildroot can generate a cross-compilation toolchain, root filesystem, Linux kernel image, and bootloader for your target machine.Buildroot can be used independently for any combination of these options (for example, you can use an existing cross-compilation toolchain and use Buildroot to build only the root filesystem).
Buildroot is primarily useful for those working with embedded systems.Embedded systems often use processors that are not the conventional x86 processors that everyone is accustomed to in PCs.They can be PowerPC processors, MIPS processors, ARM processors, etc.
Buildroot supports a variety of processors and their variants;it also comes with default configurations for several off-the-shelf boards.In addition, many third-party projects are based on Buildroot or develop their BSP[1] or SDK[2] on top of Buildroot.
[1] BSP: Board Support Package
[2] SDK: Software Development Kit