Builds uboot for Pine64 board with TFTP netboot support.
As of November 2016, the version of u-boot-2016.11-rc3 contains support for Pine64 TFTP netboot.
Just run:
$ ./build.sh
And it should build and copy pine64.img to bin/pine64.img.
Automated built image is here (around 580MB):
$ docker pull zoobab/uboot-pine64
$ dd if=bin/pine64.img of=/dev/sdx bs=64k
where sdx is you microsd device.