boards: st: stm32h573i_dk: Add board variant for app in external flash

Restore old internal flash layout as default and make app in external
flash a new board variant.

Signed-off-by: Tim Pambor <[email protected]>

Author: tpambor

boards/st/stm32h573i_dk/Kconfig.defconfig

@@ -39,4 +39,21 @@ config I2C_STM32_V2_TIMING
 
 endif # DISPLAY
 
+if BOARD_STM32H573I_DK_STM32H573XX_EXT_FLASH_APP
+
+if MCUBOOT
+
+# A dependency of FLASH_STM32_QSPI & STM32_MEMMAP
+config FLASH
+	default y
+
+# So MCUboot can access ext Flash in memory-mapped mode
+# to read app slots, start the app, or copy it to RAM.
+config STM32_MEMMAP
+	default y
+
+endif # MCUBOOT
+
+endif # BOARD_STM32H573I_DK_STM32H573XX_EXT_FLASH_APP
+
 endif # BOARD_STM32H573I_DK

boards/st/stm32h573i_dk/Kconfig.sysbuild

@@ -0,0 +1,14 @@
+# SPDX-FileCopyrightText: Copyright The Zephyr Project Contributors
+# SPDX-License-Identifier: Apache-2.0
+
+choice BOOTLOADER
+	default BOOTLOADER_MCUBOOT
+endchoice
+
+choice BOOT_SIGNATURE_TYPE
+	default BOOT_SIGNATURE_TYPE_NONE
+endchoice
+
+choice MCUBOOT_MODE
+	default MCUBOOT_MODE_DIRECT_XIP
+endchoice

boards/st/stm32h573i_dk/board.yml

@@ -4,3 +4,5 @@ board:
   vendor: st
   socs:
     - name: stm32h573xx
+      variants:
+        - name: ext_flash_app