# define the CPU architecture for the k64f
  export CPU_ARCH = cortex-m4
  
  # tell the build system that the CPU depends on the Kinetis common files
  export USEMODULE += kinetis_common
  
  # define path to kinetis module, which is needed for this CPU
  export KINETIS_COMMON = $(RIOTCPU)/kinetis_common/
  # CPU depends on the kinetis module, so include it
  include $(KINETIS_COMMON)Makefile.include
  
  #export the CPU model
  MODEL = $(shell echo $(CPU_MODEL)|tr 'a-z' 'A-Z')
  export CFLAGS += -DCPU_MODEL_$(MODEL)
  ARCH = $(shell echo $(CPU_ARCH) | tr 'a-z-' 'A-Z_')
  export CFLAGS += -DCPU_ARCH_$(ARCH)
  
  # this CPU implementation is using kinetis common startup
  export COMMON_STARTUP = $(KINETIS_COMMON)
  
  # add the CPU specific system calls implementations for the linker
  export UNDEF += $(BINDIR)/cpu/vectors.o
  
  include $(RIOTCPU)/Makefile.include.cortexm_common