BeagleBoard-x15 U-boot error

Dear all,
            Iam facing some problem on U-Boot compilation. Following the Robert Nelson site:

U-Boot steps for compilation are

1) git clone

2) cd u-boot/

3) git checkout v2017.01 -b tmp

From this step below onwards iam facing problem : site reply that unexpected fault is happen in server like that...

4) git pull --no-edit git:// ti-u-boot-2017.01

5) git checkout 590c7d7fe15d06a4d708403d3234bcd01cd039e1

6) wget -c

7) patch -p1 < 0001-beagle_x15-uEnv.txt-bootz-n-fixes.patch

8) make ARCH=arm CROSS_COMPILE=${CC} distclean

9) make ARCH=arm CROSS_COMPILE=${CC} am57xx_evm_defconfig

10) make ARCH=arm CROSS_COMPILE=${CC}