rk3399单编译内核
source build/envsetup.shlunch
make -j8 bootimage
在out目录下生成boot.img
通过下载工具吧boot.img下载到boot分区后系统无法启动，
bad image magic.
load kernel image failed
ERROR: : bootrk: bad boot or kernel image
Unable to boot:boot
try to start recovery
bad image magic.
load kernel image failed
ERROR: : bootrk: bad boot or kernel image
Unable to boot:recovery
try to start backup
bad image magic.
load boot image failed
ERROR: : bootrk: bad boot or kernel image
Unable to boot:backup
try to start rockusb
请看wiki 编译，不同Andorid版本内核编译方式不一样
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