Build U-boot
$ wget https://gist.githubusercontent.com/miyo/b36f38354a634d5801b4921423b1b120/raw/fbb97f5d2daf941e5d8a7a9a58bd1091196cdfb2/u-boot.diff
$ git clone git://git.denx.de/u-boot.git
$ cd u-boot
$ git checkout -b v2017.11 refs/tags/v2017.11
$ patch -p1 ../u-boot.diff
$ make ARCH=arm zynq_eclypsez7_defconfig
$ make -j8 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- all