afbjorklund / minimal-buildroot

Minimal buildroot for amd64 and arm64

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Minimal Buildroot

Trying to build a minimal buildroot for booting using emulator and as a virtual machine.

Just using the default setup from buildroot, will add custom kernel and software later.

  • board/

  • configs/

Target amd64 (x86_64) arm64 (aarch64)
QEMU qemu/x86_64 qemu/aarch64-virt
qemu_x86_64_defconfig qemu_aarch64_virt_defconfig
UEFI pc aarch64-efi
pc_x86_64_efi_defconfig aarch64_efi_defconfig

Just copied these files from buildroot, since it was hard to see the forest for the trees.

Some quirks: the x86_64 targets builds ext2 (not ext4), and without support for "virtio".

The name of the kernel and format of the initrd might also vary a bit, between the arch.

Linux amd64 (x86_64) arm64 (aarch64)
Kernel kernel/x86_64_defconfig kernel/aarch64_defconfig
linux/arch/x86/configs/ linux/arch/arm64/defconfig

These default configs were copied from the Linux kernel, and seen with "make defconfig".


New targets (based on UEFI above), making an .img disk with boot/root ext4 partitions.

amd64 (x86_64) arm64 (aarch64)
Image img/x86_64 img/aarch64
img_x86_64_defconfig img_aarch64_defconfig
img/x86_64/linux.config img/aarch64/linux.config

amd64

Disk disk-amd64.img: 136,5 MiB, 142656000 bytes, 278625 sectors

Device          Start    End Sectors  Size Type
disk-amd64.img1    64  32831   32768   16M EFI System
disk-amd64.img2 32832 278591  245760  120M Linux root (x86)

arm64

Disk disk-arm64.img: 232 MiB, 243270144 bytes, 475137 sectors

Device          Boot Start    End Sectors  Size Id Type
disk-arm64.img1          1  65536   65536   32M ef EFI (FAT-12/16/32)
disk-arm64.img2      65537 475136  409600  200M 83 Linux

New targets (based on UEFI above), making an .iso (ISO-9660) output instead of an .img.

amd64 (x86_64) arm64 (aarch64)
ISO iso/x86_64 iso/aarch64
iso_x86_64_defconfig iso_aarch64_defconfig

amd64

boot-amd64.iso
├── boot
│   ├── initrd.img
│   └── vmlinuz
├── boot.catalog
└── EFI
    └── BOOT
        ├── bootx64.efi
        ├── efiboot.img
        └── grub.cfg

arm64

boot-arm64.iso
├── boot
│   ├── initrd.img
│   └── vmlinuz
├── boot.catalog
└── EFI
    └── BOOT
        ├── bootaa64.efi
        ├── efiboot.img
        └── grub.cfg

  • buildroot/

  • output/

This is where the sources and build happens, and where the output ends up afterwards.

git clone --branch=2021.02.x https://github.com/buildroot/buildroot
cd buildroot
make BR2_EXTERNAL=.. <*_defconfig>
make
  • support/

Support files for building, such as a container image with all required build tools.

  • container/

Contains helper files for constructing the container image from the rootfs archive.


93M  output/images/disk-amd64.img
63M  output/images/disk-arm64.img

Start the emulator directly with the kernel and the rootfs in the same terminal window.

Start the emulator with the complete system image with grub in a new graphical window.

12M  output/images/boot-amd64.iso
29M  output/images/boot-arm64.iso

Start the emulator directly with the kernel and the initrd in the same terminal window.

Start the emulator from the UEFI CD boot image instead of disk, otherwise same as above.

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Minimal buildroot for amd64 and arm64

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