samples: sysbuild: with mcu_boot on the stm32h573i_dk

Run the sample to execute in place on the external flash of the
stm32h573 disco kit.
with_boot is build and linked for the external flash.
Download the mcuboot zephyr.bin in internal memory.
Download the with_mcuboot zephyr.signed.bin in external memory.

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

Author: FRASTM

samples/sysbuild/with_mcuboot/boards/stm32h573i_dk.overlay

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2025 STMicroelectronics
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*
+ * Define the device, controller and partition to be the external memory
+ * for running the application in external NOR from MCUboot
+ */
+/ {
+	chosen {
+		zephyr,flash = &mx25lm51245;
+		zephyr,flash-controller = &mx25lm51245;
+	};
+};

samples/sysbuild/with_mcuboot/sample.yaml

@@ -17,6 +17,7 @@ tests:
       - nucleo_h7s3l8
       - nucleo_u385rg_q
       - stm32h7s78_dk
+      - stm32h573i_dk
     integration_platforms:
       - nrf52840dk/nrf52840
       - esp32_devkitc/esp32/procpu