# determines TARGET_CPU, if not forced by user
  if [ -z "$TARGET_CPU" ]; then
    TARGET_CPU=cortex-a53
  fi

# TARGET_CPU:
# generic cortex-a35 cortex-a53 cortex-a57 cortex-a72
# exynos-m1 qdf24xx thunderx xgene1 cortex-a57.cortex-a53
# cortex-a72.cortex-a53

# determine architecture's family
  case $TARGET_CPU in
    generic|cortex-a35|cortex-a53|cortex-a57|cortex-a72|exynos-m1|qdf24xx|thunderx|xgene1|cortex-a57.cortex-a53|cortex-a72.cortex-a53)
      TARGET_SUBARCH=aarch64
      TARGET_VARIANT=armv8-a
      TARGET_ABI=eabi
      TARGET_EXTRA_FLAGS="-mcpu=${TARGET_CPU}${TARGET_CPU_FLAGS}"
      TARGET_FEATURES+=" neon"
      ;;
  esac

  TARGET_GCC_ARCH=${TARGET_SUBARCH/-}
  TARGET_KERNEL_ARCH=arm64

# setup ARCH specific *FLAGS
  TARGET_CFLAGS="-march=${TARGET_VARIANT}${TARGET_CPU_FLAGS} -mabi=lp64 -Wno-psabi -mtune=$TARGET_CPU $TARGET_EXTRA_FLAGS"
  TARGET_LDFLAGS="-march=${TARGET_VARIANT}${TARGET_CPU_FLAGS} -mtune=$TARGET_CPU"
  GCC_OPTS="--with-abi=lp64 --with-arch=$TARGET_VARIANT"