boards: st: nucleo_h7s3l8: Add ext_flash_app variant

Add ext_flash_app variant to nucleo_h7s3l8 to allow building
applications running on ext flash.

Based on Erwan Gouriou's work on stm32h7s78_dk in PR #97992
(which is based on A.Jarmouni's work on stm32h750_dk in PR 97037).

Signed-off-by: Thomas Decker <[email protected]>

Author: TD-JBL

boards/st/nucleo_h7s3l8/Kconfig.sysbuild

@@ -0,0 +1,19 @@
+# Copyright (c) 2024-2025 STMicroelectronics
+# Copyright (c) 2025 JB-Lighting Lichtanlagentechnik
+# SPDX-License-Identifier: Apache-2.0
+
+if BOARD_NUCLEO_H7S3L8_STM32H7S3XX_EXT_FLASH_APP
+
+choice BOOTLOADER
+	default BOOTLOADER_MCUBOOT
+endchoice
+
+choice BOOT_SIGNATURE_TYPE
+	default BOOT_SIGNATURE_TYPE_NONE
+endchoice
+
+choice MCUBOOT_MODE
+	default MCUBOOT_MODE_SINGLE_APP
+endchoice
+
+endif # BOARD_NUCLEO_H7S3L8_STM32H7S3XX_EXT_FLASH_APP

boards/st/nucleo_h7s3l8/board.cmake

@@ -2,7 +2,7 @@
 
 # keep first
 board_runner_args(stm32cubeprogrammer "--port=swd" "--reset-mode=hw")
-if(CONFIG_XIP AND (CONFIG_STM32_MEMMAP OR CONFIG_BOOTLOADER_MCUBOOT))
+if(CONFIG_STM32_MEMMAP OR CONFIG_BOOTLOADER_MCUBOOT)
   board_runner_args(stm32cubeprogrammer "--extload=MX25UW25645G_NUCLEO-H7S3L8.stldr")
 endif()
 board_runner_args(openocd --target-handle=_CHIPNAME.cpu0)

boards/st/nucleo_h7s3l8/board.yml

@@ -4,3 +4,5 @@ board:
   vendor: st
   socs:
     - name: stm32h7s3xx
+      variants:
+        - name: ext_flash_app

boards/st/nucleo_h7s3l8/nucleo_h7s3l8-common.dtsi

@@ -0,0 +1,233 @@
+/*
+ * Copyright (c) 2024 STMicroelectronics
+ * Copyright (c) 2025 JB-Lighting Lichtanlagentechnik
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/dts-v1/;
+#include <st/h7rs/stm32h7s3X8.dtsi>
+#include <st/h7/stm32h7s3l8hx-pinctrl.dtsi>
+#include "arduino_r3_connector.dtsi"
+#include <zephyr/dt-bindings/input/input-event-codes.h>
+
+/ {
+	chosen {
+		zephyr,console = &usart3;
+		zephyr,shell-uart = &usart3;
+		zephyr,dtcm = &dtcm;
+		zephyr,sram = &sram0;
+		zephyr,canbus = &fdcan1;
+	};
+
+	leds: leds {
+		compatible = "gpio-leds";
+
+		green_led: led_1 {
+			gpios = <&gpiod 10 GPIO_ACTIVE_HIGH>;
+			label = "User LD1";
+		};
+
+		yellow_led: led_2 {
+			gpios = <&gpiod 13 GPIO_ACTIVE_HIGH>;
+			label = "User LD2";
+		};
+
+		red_led: led_3 {
+			gpios = <&gpiob 7 GPIO_ACTIVE_HIGH>;
+			label = "User LD3";
+		};
+	};
+
+	gpio_keys {
+		compatible = "gpio-keys";
+
+		user_button: button_0 {
+			label = "User";
+			gpios = <&gpioc 13 GPIO_ACTIVE_HIGH>;
+			zephyr,code = <INPUT_KEY_0>;
+		};
+	};
+
+	aliases {
+		led0 = &green_led;
+		led1 = &yellow_led;
+		led2 = &red_led;
+		sw0 = &user_button;
+		watchdog0 = &iwdg;
+		spi-flash0 = &mx25uw25645;
+	};
+
+	ext_memory: memory@70000000 {
+		compatible = "zephyr,memory-region";
+		reg = <0x70000000 DT_SIZE_M(32)>;
+		zephyr,memory-region = "EXTMEM";
+		zephyr,memory-attr = <DT_MEM_ARM(ATTR_MPU_FLASH)>;
+	};
+};
+
+&clk_hse {
+	clock-frequency = <DT_FREQ_M(24)>;
+	status = "okay";
+};
+
+&clk_lse {
+	status = "okay";
+};
+
+&pll {
+	div-m = <12>;
+	mul-n = <200>;
+	div-p = <2>;
+	div-q = <2>;
+	div-r = <2>;
+	div-s = <2>;
+	div-t = <2>;
+	clocks = <&clk_hse>;
+	status = "okay";
+};
+
+/* PLL2 for clocking the xspi peripheral */
+&pll2 {
+	div-m = <12>;
+	mul-n = <200>;
+	div-p = <2>;
+	div-q = <2>;
+	div-r = <2>;
+	div-s = <2>;
+	div-t = <2>;
+	clocks = <&clk_hse>;
+	status = "okay";
+};
+
+&rcc {
+	clocks = <&pll>;
+	clock-frequency = <DT_FREQ_M(200)>;
+	dcpre = <1>;
+	hpre = <1>;
+	ppre1 = <2>;
+	ppre2 = <2>;
+	ppre4 = <2>;
+	ppre5 = <2>;
+};
+
+&pwr {
+	power-supply = "ldo";
+};
+
+&usart1 {
+	pinctrl-0 = <&usart1_tx_pb14 &usart1_rx_pa10>;
+	pinctrl-names = "default";
+	current-speed = <115200>;
+	status = "okay";
+};
+
+&usart3 {
+	pinctrl-0 = <&usart3_tx_pd8 &usart3_rx_pd9>;
+	pinctrl-names = "default";
+	current-speed = <115200>;
+	status = "okay";
+};
+
+&iwdg {
+	status = "okay";
+};
+
+&wwdg {
+	status = "okay";
+};
+
+&adc1 {
+	pinctrl-0 = <&adc1_inp15_pa3>; /* Arduino A0 */
+	pinctrl-names = "default";
+	st,adc-clock-source = "SYNC";
+	st,adc-prescaler = <4>;
+	status = "okay";
+};
+
+&spi1 {
+	status = "okay";
+	pinctrl-0 = <&spi1_sck_pa5 &spi1_miso_pa6 &spi1_mosi_pb5>;
+	pinctrl-names = "default";
+	cs-gpios = <&gpiod 14 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
+};
+
+&i2c1 {
+	pinctrl-0 = <&i2c1_scl_pb8 &i2c1_sda_pb9>;
+	pinctrl-names = "default";
+	status = "okay";
+	clock-frequency = <I2C_BITRATE_FAST>;
+};
+
+&fdcan1 {
+	pinctrl-0 = <&fdcan1_rx_pd0 &fdcan1_tx_pd1>;
+	pinctrl-names = "default";
+	clocks = <&rcc STM32_CLOCK(APB1_2, 8)>,
+		 <&rcc STM32_SRC_HSE FDCAN_SEL(0)>;
+	status = "okay";
+};
+
+&mac {
+	pinctrl-0 = <&eth_rmii_rxd0_pg4
+		     &eth_rmii_rxd1_pg5
+		     &eth_rmii_ref_clk_pb6
+		     &eth_rmii_crs_dv_pa7
+		     &eth_rmii_tx_en_pg11
+		     &eth_rmii_txd0_pg13
+		     &eth_rmii_txd1_pg12>;
+	pinctrl-names = "default";
+	phy-connection-type = "rmii";
+	phy-handle = <&eth_phy>;
+	status = "okay";
+};
+
+&mdio {
+	pinctrl-0 = <&eth_mdio_pa2 &eth_mdc_pg6>;
+	pinctrl-names = "default";
+	status = "okay";
+
+	eth_phy: ethernet-phy@0 {
+		compatible = "ethernet-phy";
+		reg = <0x00>;
+	};
+};
+
+&xspi2 {
+	pinctrl-0 = <&xspim_p2_clk_pn6 &xspim_p2_ncs1_pn1
+		     &xspim_p2_io0_pn2 &xspim_p2_io1_pn3
+		     &xspim_p2_io2_pn4 &xspim_p2_io3_pn5
+		     &xspim_p2_io4_pn8 &xspim_p2_io5_pn9
+		     &xspim_p2_io6_pn10 &xspim_p2_io7_pn11
+		     &xspim_p2_dqs0_pn0>;
+	pinctrl-names = "default";
+
+	status = "okay";
+
+	ext_flash_ctrl: xspi-nor-flash@0 {
+		compatible = "st,stm32-xspi-nor";
+		reg = <0>;
+		size = <DT_SIZE_M(256)>; /* 256Mbits */
+		ospi-max-frequency = <DT_FREQ_M(50)>;
+		spi-bus-width = <XSPI_OCTO_MODE>;
+		data-rate = <XSPI_DTR_TRANSFER>;
+		four-byte-opcodes;
+		status = "okay";
+
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0x0 0x70000000 DT_SIZE_M(32)>;
+
+		ext_flash: mx25uw25645: xspi-nor-flash@0 {
+			compatible = "soc-nv-flash";
+			reg = <0x0 DT_SIZE_M(32)>;
+			write-block-size = <1>;
+			erase-block-size = <DT_SIZE_K(4)>;
+
+			partitions {
+				compatible = "fixed-partitions";
+				#address-cells = <1>;
+				#size-cells = <1>;
+			};
+		};
+	};
+};