Boot Linux faster!

Check our new training course

Boot Linux faster!

Check our new training course
and Creative Commons CC-BY-SA
lecture and lab materials

Bootlin logo

Elixir Cross Referencer

CONFIG_ARM=y
CONFIG_BOARD_NUCLEO_F401RE=y
CONFIG_SOC_SERIES_STM32F4X=y
CONFIG_SOC_STM32F401XE=y
# 84MHz system clock
CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=84000000
CONFIG_SYS_CLOCK_TICKS_PER_SEC=1000

# enable USART2 - passthrough to STLINK v2 connector
CONFIG_UART_STM32_PORT_1=y
CONFIG_UART_STM32_PORT_1_BAUD_RATE=115200
# enable console on this port by default
CONFIG_UART_CONSOLE_ON_DEV_NAME="UART_1"

# enable pinmux
CONFIG_PINMUX=y

# enable GPIO ports A, B, C
CONFIG_GPIO=y

# clock configuration
CONFIG_CLOCK_CONTROL=y
CONFIG_CLOCK_STM32F4X_SYSCLK_SRC_PLL=y
# use HSE as PLL input
CONFIG_CLOCK_STM32F4X_PLL_SRC_HSE=y
# however, the board does not have an external oscillator, so just use
# the 8MHz clock signal coming from integrated STLink
CONFIG_CLOCK_STM32F4X_HSE_BYPASS=y
# produce 84MHz clock at PLL output
CONFIG_CLOCK_STM32F4X_PLLM_DIV_FACTOR=8
CONFIG_CLOCK_STM32F4X_PLLN_MULTIPLIER=336
CONFIG_CLOCK_STM32F4X_PLLP_DIV_FACTOR=4
CONFIG_CLOCK_STM32F4X_PLLQ_DIV_FACTOR=7
CONFIG_CLOCK_STM32F4X_AHB_PRESCALER=0
CONFIG_CLOCK_STM32F4X_APB1_PRESCALER=2
CONFIG_CLOCK_STM32F4X_APB2_PRESCALER=0