Contents
How does Buildroot work?
Buildroot is a tool that simplifies and automates the process of building a complete Linux system for an embedded system, using cross-compilation. In order to achieve this, Buildroot is able to generate a cross-compilation toolchain, a root filesystem, a Linux kernel image and a bootloader for your target.
How do I start Buildroot?
Here are the steps Buildroot goes through when building a package:
- Download the package (to the dl directory)
- Extract the package (inside the output/build directory)
- Patch the source code.
- Configure the package.
- Build the package.
- Install the package (to output/target directory)
What is Buildroot toolchain?
▶ Buildroot is an embedded Linux build system. ▶ Its goal is to build. ► a cross-compiling toolchain. ► a root filesystem with multiple cross-compiled libraries and. applications.
What should the custom version be in Buildroot?
For example, set BR2_LINUX_KERNEL_CUSTOM_VERSION=y and BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE to the kernel version you tested with. It is recommended to use as much as possible upstream versions of the Linux kernel and bootloaders, and to use as much as possible default kernel and bootloader configurations.
Where do I find the defconfig file in Buildroot?
This is because package selections are highly application-specific. Once you have a known working configuration, run make savedefconfig. This will generate a minimal defconfig file at the root of the Buildroot source tree. Move this file into the configs/ directory, and rename it _defconfig.
What are the sections of the Buildroot manual?
Typical sections are Architecture, Toolchain options (typically just linux headers version), Firmware, Bootloader, Kernel, and Filesystem. Always use fixed versions or commit hashes for the different components, not the “latest” version.
Is there a default parallelism level in Buildroot?
Buildroot has always been capable of using parallel build on a per package basis: each package is built by Buildroot using make -jN (or the equivalent invocation for non-make-based build systems). The level of parallelism is by default number of CPUs + 1, but it can be adjusted using the BR2_JLEVEL configuration option.