zephyr/boards/arm/nucleo_f302r8/nucleo_f302r8_defconfig

CONFIG_ARM=y
CONFIG_SOC_SERIES_STM32F3X=y
CONFIG_SOC_STM32F302X8=y
# 72 MHz system clock
CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=72000000
CONFIG_SYS_CLOCK_TICKS_PER_SEC=1000

CONFIG_SERIAL=y

# console
CONFIG_CONSOLE=y
CONFIG_UART_CONSOLE=y

# enable pinmux
CONFIG_PINMUX=y

# enable GPIO
CONFIG_GPIO=y

# clock configuration
CONFIG_CLOCK_CONTROL=y

# Clock configuration for Cube Clock control driver
CONFIG_CLOCK_STM32_HSE_CLOCK=8000000
CONFIG_CLOCK_STM32_SYSCLK_SRC_PLL=y
# use HSE as PLL input
CONFIG_CLOCK_STM32_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_STM32_HSE_BYPASS=y
# produce 72MHz clock at PLL output
CONFIG_CLOCK_STM32_PLL_PREDIV=1
CONFIG_CLOCK_STM32_PLL_MULTIPLIER=9
CONFIG_CLOCK_STM32_AHB_PRESCALER=1
CONFIG_CLOCK_STM32_APB1_PRESCALER=2
CONFIG_CLOCK_STM32_APB2_PRESCALER=1