boards: frdm_mcxn947: Add a variant for executing from QSPI

1. The boards always boots from internal flash. However it does
have an external QSPI that can be used to store Zephyr.
Add a variant to support running Zephyr from QSPI Flash.
Running Zephyr from QSPI requires a bootloader like MCUboot
to be pogrammed to internal flash.
2. Create a common dts file to add features that are enabled for
CPU 0 that is included by both vairants i.e internal flash (default)
and QSPI variant.

Signed-off-by: Mahesh Mahadevan <[email protected]>

Author: mmahadevan108

boards/nxp/frdm_mcxn947/Kconfig.frdm_mcxn947

@@ -2,6 +2,6 @@
 # SPDX-License-Identifier: Apache-2.0
 
 config BOARD_FRDM_MCXN947
-	select SOC_MCXN947_CPU0 if BOARD_FRDM_MCXN947_MCXN947_CPU0
+	select SOC_MCXN947_CPU0 if BOARD_FRDM_MCXN947_MCXN947_CPU0 || BOARD_FRDM_MCXN947_MCXN947_CPU0_QSPI
 	select SOC_MCXN947_CPU1 if BOARD_FRDM_MCXN947_MCXN947_CPU1
 	select SOC_PART_NUMBER_MCXN947VDF

boards/nxp/frdm_mcxn947/board.yml

@@ -3,3 +3,6 @@ board:
   vendor: nxp
   socs:
   - name: mcxn947
+    variants:
+    - name: qspi
+      cpucluster: 'cpu0'

boards/nxp/frdm_mcxn947/doc/index.rst

@@ -205,6 +205,42 @@ see the following message in the terminal:
    *** Booting Zephyr OS build v3.6.0-479-g91faa20c6741 ***
    Hello World! frdm_mcxn947/mcxn947/cpu0
 
+Flashing to QSPI
+================
+
+Here is an example for the :ref:`hello_world` application.
+
+.. zephyr-app-commands::
+   :zephyr-app: zephyr/samples/hello_world -DCONFIG_MCUBOOT_SIGNATURE_KEY_FILE=\"bootloader/mcuboot/root-rsa-2048.pem\" -DCONFIG_BOOTLOADER_MCUBOOT=y
+   :board: frdm_mcxn947/mcxn947/cpu0/qspi
+   :goals: flash
+
+
+In order to load Zephyr application from QSPI you should program a bootloader like
+MCUboot bootloader to internal flash. Here are the steps.
+
+.. zephyr-app-commands::
+   :zephyr-app: bootloader/mcuboot/boot/zephyr
+   :board: frdm_mcxn947/mcxn947/cpu0/qspi
+   :goals: flash
+
+Open a serial terminal, reset the board (press the RESET button), and you should
+see the following message in the terminal:
+
+.. code-block:: console
+
+  *** Booting MCUboot v2.1.0-rc1-2-g9f034729d99a ***
+  *** Using Zephyr OS build v3.6.0-4046-gf279a03af8ab ***
+  I: Starting bootloader
+  I: Primary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3
+  I: Secondary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3
+  I: Boot source: none
+  I: Image index: 0, Swap type: none
+  I: Bootloader chainload address offset: 0x0
+  I: Jumping to the first image slot
+  *** Booting Zephyr OS build v3.6.0-4046-gf279a03af8ab ***
+  Hello World! frdm_mcxn947/mcxn947/cpu0/qspi
+
 Debugging
 =========
 

boards/nxp/frdm_mcxn947/frdm_mcxn947_mcxn947_cpu0.dts

@@ -6,179 +6,9 @@
 
 /dts-v1/;
 
-#include <nxp/nxp_mcxn94x.dtsi>
-#include "frdm_mcxn947.dtsi"
+#include "frdm_mcxn947_mcxn947_cpu0.dtsi"
 
 / {
 	model = "NXP FRDM_N94 board";
 	compatible = "nxp,mcxn947", "nxp,mcx";
-
-	cpus {
-		/delete-node/ cpu@1;
-	};
-
-	chosen {
-		zephyr,sram = &sram0;
-		zephyr,flash = &flash;
-		zephyr,flash-controller = &fmu;
-		zephyr,code-partition = &slot0_partition;
-		zephyr,console = &flexcomm4_lpuart4;
-		zephyr,shell-uart = &flexcomm4_lpuart4;
-		zephyr,canbus = &flexcan0;
-	};
-
-	aliases{
-		watchdog0 = &wwdt0;
-		pwm-0 = &flexpwm1_pwm0;
-	};
-};
-
-/*
- * Default for this board is to allocate SRAM0-5 to cpu0 but the
- * application can have an application specific device tree to
- * allocate the SRAM0-7 differently.
- *
- * For example, SRAM0-6 could be allocated to cpu0 with only SRAM7
- * for cpu1. This would require the value of sram0 to have a DT_SIZE_K
- * of 384. You would have to make updates to cpu1 sram settings as well.
- */
-&sram0 {
-	compatible = "mmio-sram";
-	reg = <0x20000000 DT_SIZE_K(320)>;
-};
-
-&gpio4 {
-	status = "okay";
-};
-
-&gpio1 {
-	status = "okay";
-};
-
-&gpio0 {
-	status = "okay";
-};
-
-&gpio2 {
-	status = "okay";
-};
-
-&green_led {
-	status = "okay";
-};
-
-&red_led {
-	status = "okay";
-};
-
-&user_button_2 {
-	status = "okay";
-};
-
-&edma0 {
-	status = "okay";
-};
-
-&flexcomm1 {
-	status = "okay";
-};
-
-&flexcomm1_lpspi1 {
-	status = "okay";
-};
-
-&flexcomm2 {
-	status = "okay";
-};
-
-&flexcomm2_lpi2c2 {
-	status = "okay";
-};
-
-/*
- *LPFLEXCOMM supports UART and I2C on the same instance, enable this for
- * LFLEXCOMM2
- */
-&flexcomm2_lpuart2 {
-	status = "okay";
-};
-
-&flexcomm4 {
-	status = "okay";
-};
-
-&flexcomm4_lpuart4 {
-	status = "okay";
-};
-
-&flexspi {
-	status = "okay";
-};
-
-&w25q64jvssiq {
-	status = "okay";
-};
-
-&dac0 {
-	status = "okay";
-};
-
-&enet {
-	status = "okay";
-};
-
-&enet_mac {
-	status = "okay";
-};
-
-&enet_mdio {
-	status = "okay";
-};
-
-&wwdt0 {
-	status = "okay";
-};
-
-&flexpwm1_pwm0 {
-	status = "okay";
-};
-
-&flexcan0 {
-	status = "okay";
-};
-
-&ctimer0 {
-	status = "okay";
-};
-
-&usdhc0 {
-	status = "okay";
-	sdmmc {
-		compatible = "zephyr,sdmmc-disk";
-		status = "okay";
-	};
-};
-
-&vref {
-	status = "okay";
-};
-
-&lpadc0 {
-	status = "okay";
-};
-
-zephyr_udc0: &usb1 {
-	status = "okay";
-};
-
-&lpcmp0 {
-	status = "okay";
-};
-
-&lptmr0 {
-	status = "okay";
-};
-
-&flexio0 {
-	status = "okay";
 };