CONFIG_ARM=y
CONFIG_SOC_SERIES_STM32L1X=y
CONFIG_SOC_STM32L151XB=y
CONFIG_CORTEX_M_SYSTICK=y
# 32MHz system clock
CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=32000000

# enable uart driver
CONFIG_SERIAL=y

# enable pinmux
CONFIG_PINMUX=y

# enable GPIO
CONFIG_GPIO=y

# clock configuration
CONFIG_CLOCK_CONTROL=y
# SYSCLK selection
CONFIG_CLOCK_STM32_SYSCLK_SRC_PLL=y
# Use HSI source
CONFIG_CLOCK_STM32_PLL_SRC_HSI=y
CONFIG_CLOCK_STM32_PLL_DIVISOR=2
# produce 32Mhz clock at PLL output
CONFIG_CLOCK_STM32_PLL_MULTIPLIER=4
CONFIG_CLOCK_STM32_AHB_PRESCALER=1
CONFIG_CLOCK_STM32_APB1_PRESCALER=1

# console
CONFIG_CONSOLE=y
CONFIG_UART_CONSOLE=y