CONFIG_ARM=y CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=120000000 CONFIG_PLATFORM_FSL_FRDM_K64F=y CONFIG_CONSOLE=y CONFIG_UART_CONSOLE=y CONFIG_SERIAL=y CONFIG_CORTEX_M_SYSTICK=y CONFIG_FLASH_SIZE=1024 CONFIG_SRAM_SIZE=192 CONFIG_UART_K20=y