The ramdisk image for radxa rock and other rockchip based platforms.
find . ! -path "./.git*" | cpio -H newc -ov > initrd.img
Visit http://wiki.radxa.com/Rock/Booting_Linux for more information.
Based on https://github.com/Galland/rk30_linux_initramfs which is based on fkubi's initramfs who in turn based it on Debian's initramfs.cpio.