boards: nxp: imx943_evk: add M33 DDR variant support

Added i.MX943 EVK M33 DDR variant support.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>

boards/nxp/imx943_evk/Kconfig.imx943_evk

@@ -3,5 +3,5 @@
 
 config BOARD_IMX943_EVK
 	select SOC_MIMX94398_A55 if BOARD_IMX943_EVK_MIMX94398_A55
-	select SOC_MIMX94398_M33 if BOARD_IMX943_EVK_MIMX94398_M33
+	select SOC_MIMX94398_M33 if BOARD_IMX943_EVK_MIMX94398_M33 || BOARD_IMX943_EVK_MIMX94398_M33_DDR
 	select SOC_PART_NUMBER_MIMX94398AVKM

boards/nxp/imx943_evk/board.yml

@@ -4,3 +4,6 @@ board:
   vendor: nxp
   socs:
   - name: mimx94398
+    variants:
+    - name: ddr
+      cpucluster: m33

boards/nxp/imx943_evk/imx943_evk_mimx94398_m33_ddr.dts

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2025 NXP
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/dts-v1/;
+
+#include "imx943_evk_mimx94398_m33.dts"
+
+/ {
+	model = "NXP i.MX943 EVK board DDR variant";
+
+	chosen {
+		zephyr,sram = &ddr;
+		/delete-property/ zephyr,flash;
+	};
+
+	ddr: memory@86000000 {
+		device_type = "memory";
+		reg = <0x86000000 DT_SIZE_M(4)>;
+	};
+};

boards/nxp/imx943_evk/imx943_evk_mimx94398_m33_ddr.yaml

@@ -0,0 +1,17 @@
+#
+# Copyright 2025 NXP
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+identifier: imx943_evk/mimx94398/m33/ddr
+name: NXP i.MX943 EVK M33 DDR variant
+type: mcu
+arch: arm
+ram: 4096
+toolchain:
+  - zephyr
+  - gnuarmemb
+supported:
+  - uart
+vendor: nxp

boards/nxp/imx943_evk/imx943_evk_mimx94398_m33_ddr_defconfig

@@ -0,0 +1,23 @@
+#
+# Copyright 2025 NXP
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+# clock-related configurations
+CONFIG_CLOCK_CONTROL=y
+
+# serial interface-related configurations
+CONFIG_SERIAL=y
+CONFIG_UART_INTERRUPT_DRIVEN=y
+CONFIG_UART_CONSOLE=y
+CONFIG_CONSOLE=y
+
+# SCMI-related configurations
+CONFIG_MBOX=y
+CONFIG_MBOX_INIT_PRIORITY=0
+CONFIG_ARM_SCMI=y
+CONFIG_ARM_SCMI_NXP_VENDOR_EXTENSIONS=y
+
+# kernel-related configurations
+CONFIG_XIP=n