CONFIG_ARM=y CONFIG_SOC_MK64F12=y CONFIG_SOC_SERIES_KINETIS_K6X=y CONFIG_BOARD_FRDM_K64F=y CONFIG_CONSOLE=y CONFIG_UART_CONSOLE=y CONFIG_SERIAL=y CONFIG_CORTEX_M_SYSTICK=y CONFIG_UART_K20=y CONFIG_GPIO=y CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=120000000 CONFIG_OSC_EXTERNAL=y