this is Android GPU Library

GPU_TARGET_PLATFORM  is the same as the Kernel.
   cpu      kernel    android     GPU_TARGET_PLATFORM
cortex-a9    32bit     32bit          default_7a
cortex-a53   32bit     32bit          default_7a
cortex-a53   64bit     32bit          default_8a
cortex-a53   64bit     64bit          default_8a

GPU_TARGET_PLATFORM?= default_7a

library symbols was put at
ftp://ftp-china.amlogic.com/mbox/gpu-lib/

ddk git

git clone ssh://android@10.8.9.5/platform/hardware/gpu/mali/ddk -b aml-64bit-r5p1