buildroot (initramfs) for Bananapi-R2/R64
for r2 change this in configs/BPI-R64_defconfig
#BR2_aarch64=y
#BR2_cortex_a53=y
BR2_arm=y
BR2_cortex_a7=y
and run
make BPI-R64_defconfig
then run make to start building-process
after that ./output/images/rootfs.cpio.gz is created which can be linked into linux kernel