U-Boot for A64 git

[longsleep]

I tried both the Ubuntu gcc for arm, and also the one from Linaro.
On the Internet it suggests to use the gcc4 version of the file. However, there is a preprocessor error when making the change.

What version of the gcc-arm-linux-gnueabihf toolchain is that? I use gcc-arm-linux-gnueabihf 4:4.8.2-1 as in the Ubuntu repository (on trusty). So you should try with 4.8 as well and i guess it will work. Let me know.

Update: I see now that i should add some details about the toolchains. For U-Boot and ATF use gcc-arm-linux-gnueabihf 4.8. For Kernel and Busybox use gcc-aarch64-linux-gnu 5.2. Kernel and Busybox might work with older version as well, but i did not test. You cannot compile U-Boot with anything newer than 4.8. I will add details to the docs asap.