Small howto

For Orange Pi Lite 2 boards

Build docker

cd orangepilite2
docker build \
    -t uboot_builder .

Copy u-boot spi image

cd orangepilite2
docker run --rm \
    --mount type=bind,source="$(pwd)"/output,target=/output \
    uboot_builder \
    cp /u-boot-sunxi-with-spl.bin /output

ls -al ./output

For Orange Pi PC boards

Build docker

cd orangepipc
docker build \
    -t uboot_builder .

Copy u-boot spi image

cd orangepipc 
docker run --rm \
    --mount type=bind,source="$(pwd)"/output,target=/output \
    uboot_builder \
    cp /u-boot-sunxi-with-spl.bin /output

ls -al ./output

For Orange Pi Zero Plus boards

Build docker

cd orangepizeroplus
docker build \
    -t uboot_builder .

Copy u-boot spi image

cd orangepizeroplus
docker run --rm \
    --mount type=bind,source="$(pwd)"/output,target=/output \
    uboot_builder \
    cp /u-boot-sunxi-with-spl.bin /output

ls -al ./output