Optee OS compilation issue for Raspberry Pi 3 platform

Hi Experts,

I am trying to compile the Optee OS for Raspberry Pi 3 platform.It is 64bit aarch-linux-gnu.

So i am giving the option like below for compilation but i am getting the compilation errors related to aarch32 and aarch64.

make CFG_AARCH64_core=y CROSS_COMPILE64="aarch64-linux-gnu-"

I don't know whether my compilation procedure is correct or not? Please someone suggest me ,How to compile the OPTEE OS build for Raspberry pi 3 platform?

Thanks!