Buildroot

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In your linux SDK root directory. Use beclow command to config your buildroot for RK3399 Linux

source ./envsetup.sh rockchip_rk3399

In your linux SDK root directory. Use beclow command to config your buildroot for RK3399 Linux

source ./envsetup.sh rockchip_rk3288

In your linux SDK root directory. Use beclow command to config your buildroot for RK3399 Linux

source ./envsetup.sh rockchip_rk3328

Build buildroot rootfs

make

It will generate the rootfs image in buildroot/out/{config name}/images directory. For example, when you using rockchip_rk3399. image will be in buildroot/output/rockchip_rk3399/images/

buildroot/output/rockchip_rk3399/images/
├── Image
├── rootfs.ext2
└── rootfs.ext4 -> rootfs.ext2

Please refer to Buildroot user manual for more detail about Buildroot