CFLAGS += -mcpu=cortex-a53 \
-DBCM_VERSION=2837 \
-DCFG_TUSB_MCU=OPT_MCU_BCM2837
CROSS_COMPILE = aarch64-none-elf-
SUFFIX = 8
INC += $(TOP)/lib/CMSIS_5/CMSIS/Core_A/Include