boards/arm/nucleo_g071rb/nucleo_g071rb_defconfig

# Zephyr Kernel Configuration
CONFIG_ARM=y
CONFIG_SOC_SERIES_STM32G0X=y
CONFIG_SOC_STM32G071XX=y
CONFIG_BOARD_NUCLEO_G071RB=y

# Enable MPU
CONFIG_ARM_MPU=y

# 64MHz system clock
CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=64000000

# Serial Drivers
CONFIG_SERIAL=y
CONFIG_UART_INTERRUPT_DRIVEN=y
# enable console
CONFIG_CONSOLE=y
CONFIG_UART_CONSOLE=y

# Pinmux Driver
CONFIG_PINMUX=y

# GPIO Controller
CONFIG_GPIO=y

# Clock configuration
CONFIG_CLOCK_CONTROL=y
# SYSCLK selection
CONFIG_CLOCK_STM32_SYSCLK_SRC_PLL=y
# PLL configuration
CONFIG_CLOCK_STM32_PLL_SRC_HSI=y
# produce 64MHz clock at PLL output
CONFIG_CLOCK_STM32_PLL_M_DIVISOR=1
CONFIG_CLOCK_STM32_PLL_N_MULTIPLIER=8
CONFIG_CLOCK_STM32_PLL_P_DIVISOR=2
CONFIG_CLOCK_STM32_PLL_Q_DIVISOR=2
CONFIG_CLOCK_STM32_PLL_R_DIVISOR=2
CONFIG_CLOCK_STM32_AHB_PRESCALER=1
CONFIG_CLOCK_STM32_APB1_PRESCALER=1