Hi @sabas1080 ,
FLASH_BANK1_END is defined by the CMSIS device file.
For this version stm32l151xb it is not defined as few flash size.

So in stm32_eeprom.c, it require to handle this case:

Probably like this

#ifdef FLASH_BANK2_END
#define FLASH_BASE_ADDRESS  ((uint32_t)((FLASH_BANK2_END + 1) - FLASH_PAGE_SIZE))
#elif defined(FLASH_BANK1_END)
#define FLASH_BASE_ADDRESS  ((uint32_t)((FLASH_BANK1_END + 1) - FLASH_PAGE_SIZE))
#else
#define FLASH_BASE_ADDRESS  ((uint32_t)((FLASH_END + 1) - FLASH_PAGE_SIZE))
#endif // FLASH_BANK2_END

Thanks, compiled blink!

I just need the test

Work ok blink, define led_built ok, Serial ok

It seems you used an old version of the core to test.
For better Arduino compatibility, some pins definitions have changed.
See https://github.com/stm32duino/Arduino_Core_STM32/blob/master/variants/board_template/variant.h
ex: Analog pins is no more an enum.

RAK is not a Nucleo 64. It hink you could add a "RAK" menu and then the RAK 811
I will have a look deeply next week.

This PR should be replaced by this one: #254

#254 merged.
Close this one.