drivers: flash: stm32 flash driver has a Kconfig STM32_MEMMAP

This CONFIG_STM32_MEMMAP is for enabling the MemoryMapped mode
on external octo or quad spi memory.
In this case, the flash_stm32_read is done in mem map mode
the flash_stm32_erase is not available.

Signed-off-by: Francois Ramu <[email protected]>

Author: FRASTM

drivers/flash/Kconfig.stm32

@@ -71,4 +71,11 @@ config FLASH_STM32_BLOCK_REGISTERS
 	  registers improves system security, because flash content (or
 	  protection settings) can't be changed even when exploit was found.
 
+config STM32_MEMMAP
+	bool "NOR Flash in MemoryMapped for XiP"
+	depends on XIP
+	help
+	  This option enables the XIP mode for the external NOR flash
+	  mounted on STM32 boards.
+
 endif # SOC_FLASH_STM32