U-Boot

This page is incomplete, you're welcome to improve it.

Compiling Uboot

First, You need to compile ATF:

 git clone https://github.com/crust-firmware/arm-trusted-firmware/
 cd arm-trusted-firmware
 CROSS_COMPILE=aarch64-linux-gnu-
 export CROSS_COMPILE
 export ARCH=arm64
 make PLAT=sun50i_a64 bl31
 cp build/sun50i_a64/release/bl31.bin ../u-boot/
 cd ..

After ATF is compiled clone u-boot and copy the bl31.bin file into the u-boot directly.

git clone https://gitlab.com/pine64-org/u-boot.git
cp build/sun50i_a64/release/bl31.bin ../u-boot/

Note that you can append -j# to the end of make all in the proceeding instructions. Replacing the hashtag with the number of threads in your computer's CPU which you want to use for compiling, will make it go faster and use more of your processor.

 cd u-boot/
 git checkout crust
 CROSS_COMPILE=aarch64-linux-gnu-
 export CROSS_COMPILE
 export BL31=bl31.bin
 export ARCH=arm64
 make distclean
 make pinephone_defconfig
 make all

Uboot installation

Once successfully compiled you can proceed to flash the device

Replace [CHANGE THIS] with the location of your SD card

sudo dd if=u-boot-sunxi-with-spl.bin of=/dev/[CHANGE THIS] bs=1024 seek=8