```make ARCH=aarch32 CROSS_COMPILE=arm-linux-gnueabihf- PLAT=rk3288 AARCH32_SP=sp_min```
```cp ~/arm-trusted-firmware/build/rk3288/release/bl32/bl32.elf ./bl31.elf```
```pip3 install pyelftools```
```tools/mkimage -n rk3288 -T rksd -d tpl/u-boot-tpl.bin idbloader.img
cat spl/u-boot-spl.bin >> idbloader.img```
```make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- evb-rk3288-rk808_defconfig```