【完整的bootcmd启动命令】

setenv bootargs "initrd=initrd.img-4.4.143-999-rockchip-g root=UUID=d99ac41e-e8cc-4c73-a420-e71f15e42042 rootwait rw rootfstype=ext4 console=tty1 console=ttyS0,1500000n8 panic=10 consoleblank=0 loglevel=7"
load mmc 0:1 0x04000000 /initrd.img-4.4.143-999-rockchip-g
load mmc 0:1 0x00280000 /vmlinuz-4.4.143-999-rockchip-g
load mmc 0:1 0x01f00000 /dtbs/4.4.143-999-rockchip-g/rockchip/rk3308-rock-pi-s.dtb
fdt addr 0x01f00000
fdt resize 65536
load mmc 0:1 0x05000000 /dtbs/4.4.143-999-rockchip-g/rockchip/overlay/rk3308-uart0.dtbo
fdt apply 0x05000000
load mmc 0:1 0x05000000 /dtbs/4.4.143-999-rockchip-g/rockchip/overlay/rockchip-fixup.scr
source 0x05000000
booti 0x00280000 0x04000000:0x8387a9 0x01f00000

source 0x05000000

这两句话没有用，可以删掉。