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Building Linux kernel with Filesystem Using Buildroot

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Yuriy Kolerov edited this page Jul 24, 2023 · 8 revisions

Getting Buildroot

Stable Buildroot releases are published every three months. Tarballs are available for each stable release (http://buildroot.org/downloads/). However, you can clone an upstream Git repository:

$ git clone https://git.busybox.net/buildroot
$ cd buildroot

Upstream Buildroot does not support ARCv3 families. If you are going to build Linux for ARCv3 then consider using a separate Synopsys repository with patches for support of ARC HS5x and ARC HS6x:

$ git clone https://github.com/foss-for-synopsys-dwc-arc-processors/buildroot
$ cd buildroot

Using Predefined Configurations

Buildroot uses configuration files (defconfigs) for configuring a root filesystem, a toolchain, a Linux kernel, etc. Buildroot comes with a number of existing predefined configurations which may be found in config directory. Use make list-defconfigs command to list all available configurations:

$ make list-defconfigs | grep snps
  snps_arc32_defconfig                - Build for snps_arc32
  snps_arc64_defconfig                - Build for snps_arc64
  snps_arc700_axs101_defconfig        - Build for snps_arc700_axs101
  snps_archs38_axs103_defconfig       - Build for snps_archs38_axs103
  snps_archs38_haps_defconfig         - Build for snps_archs38_haps
  snps_archs38_hsdk_defconfig         - Build for snps_archs38_hsdk

Here is a short description of each configuration:

  • snps_arc32_defconfig - A configuration for ARC HS5x on HAPS, nSIM or QEMU (available only in a separate repository).
  • snps_arc64_defconfig - A configuration for ARC HS6x on HAPS, nSIM or QEMU (available only in a separate repository).
  • snps_arc700_axs101_defconfig - A configuration for ARC 700 on AXS101 development board.
  • snps_archs38_axs103_defconfig - A configuration for ARC HS38 on AXS103 development board.
  • snps_archs38_haps_defconfig - A configuration for ARC HS3x/4x in ZeBU, HAPS, nSIM or QEMU.
  • snps_archs38_hsdk_defconfig - A configuration for ARC HS3x/4x on HSDK and HSDK 4xD development boards. This configuration builds images for running Linux using U-Boot.

Configuring Filesystem and Kernel

You can select a predefined configuration this way:

$ make snps_archs38_haps_defconfig

You can manually tune filesystem's configuration this way:

$ make menuconfig

Also, you can configure kernel's options this way:

$ make linux-menuconfig

The final configuration file is saved in .config file.

Building Linux

Build an image using make:

$ make
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