ext4load mmc 0 0x46000000 zImage
ext4load mmc 0 0x49000000 sun7i-a20-bananapi.dtb
ext4load mmc 0 0x41000000 uCore
setenv bootargs console=ttyS0,115200 console=tty1 root=/dev/mmcblk0p1 rootwait panic=10 ${extra}
bootz 0x46000000 0x41000000 0x49000000