Orange Pi RK3399 User Manual page 27

Orange Pi User Manual Shenzhen Xunlong Software Co., Ltd.
p for partition, represents partition, such as boot loader1 system
i for image, represents path of image
You could also flash different partitions separately, for example:
Separate flashing boot:
./build/flash_tool.sh -c rk3399 -p boot -i out/boot.img
Separate flashing uboot:
./build/flash_tool.sh -p loader1 -i out/u-boot/idbloader.img -c rk3399
./build/flash_tool.sh -p loader2 -i out/u-boot/uboot.img -c rk3399
./build/flash_tool.sh -p atf -i out/u-boot/trust.img -c rk3399
www.orangepi.org 24 www.xunlong.tv