How to build Linux image based on pc_x86_64_bios_defconfig but with f2fs filesystem.

Compare with pc_x86_64_bios_defconfig

Config f2fs_qemu_x86_64_defconfig is based on pc_x86_64_bios_defconfig. f2fs is enabled in Linux kernel. f2fs is enabled in GNU GRUB (BR2_TARGET_GRUB2_BUILTIN_MODULES_PC now contains f2fs). grub's timeout is 0 so you willn't see him.

Clone

git clone --remote-submodules --recurse-submodules -j8 https://github.com/AndreiCherniaev/buildroot_f2fs_qemu_x86_64.git
cd buildroot_f2fs_qemu_x86_64

Make image

make clean -C buildroot
make BR2_EXTERNAL=$PWD/my_external_tree -C $PWD/buildroot f2fs_qemu_x86_64_defconfig
make -C buildroot

Save non-default buildroot .config

To save non-default buildroot's buildroot/.config to $PWD/my_external_tree/configs/f2fs_qemu_x86_64_defconfig

make -C $PWD/buildroot savedefconfig BR2_DEFCONFIG=$PWD/my_external_tree/configs/f2fs_qemu_x86_64_defconfig

Tune and rebuild Kernel

Tune Linux kernel

make linux-menuconfig -C buildroot

Rebuild kernel

make linux-dirclean -C buildroot && make linux-rebuild -C buildroot && make -C buildroot

Save non-default Linux .config

In case of Buildroot to save non-default Linux's .config to my_external_tree/board/my_company/my_board/linux_f2fs.config

make -C $PWD/buildroot/ linux-update-defconfig BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE=$PWD/my_external_tree/board/my_company/my_board/linux_f2fs.config

Start in QEMU

This code is based on emulation script, run the emulation with:

qemu-system-x86_64 -M pc -drive file=../Buildroot.img,if=virtio,format=raw -net nic,model=virtio -net user

Note: image file Buildroot.img is located outside of repo folder so we use ../. Optionally add -nographic to see output not in extra screen but in console terminal. Or -display curses to pseudographic.