defunct: playing around with bootloaders

software/apps/snippets/bootloader/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.20)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+
+project(bootloader LANGUAGES C)
+zephyr_include_directories(../../../include)
+add_subdirectory(../../../lib lib)
+target_sources(app PRIVATE src/main.c)

software/apps/snippets/bootloader/README.md

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+# Firmware Node Application
+
+This Zephyr application provides firmware management capabilities for the irrigation system.
+
+**Tested on Zephyr 4.1.99**
+
+## Features
+
+### Step 1: Shell with Reset Command
+- Shell interface with custom "reset" command
+- Warm reboot functionality
+
+### Planned Features
+- MCUboot support with partition manager
+- Firmware version display
+- MCUmgr support for OTA updates
+
+## Building
+
+```bash
+west build -p auto -b weact_stm32g431_core apps/firmware_node -- -DBOARD_FLASH_RUNNER=blackmagicprobe
+```
+
+## Flashing
+
+```bash
+west flash
+```
+
+## Usage
+
+Connect to the device via serial console and use the shell:
+- `reset` - Reboot the system
+- `help` - Show available commands

software/apps/snippets/bootloader/VERSION

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+VERSION_MAJOR = 0
+VERSION_MINOR = 0
+PATCHLEVEL = 1
+VERSION_TWEAK = 0
+EXTRAVERSION = testing

software/apps/snippets/bootloader/erase.sh

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+#!/bin/bash
+/home/edi/zephyr-sdk-0.17.1/arm-zephyr-eabi/bin/arm-zephyr-eabi-gdb \
+	-ex 'target extended-remote /dev/ttyACM0' \
+	-ex 'monitor swdp_scan' \
+	-ex 'attach 1' \
+	-ex 'monitor erase_mass' \
+	-ex 'detach' \
+	-ex 'quit' \

software/apps/snippets/bootloader/prj.conf

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+CONFIG_SHELL=y
+CONFIG_REBOOT=y
+
+# MCUboot support for recovery request function
+CONFIG_MCUBOOT_BOOTUTIL_LIB=y
+CONFIG_MCUBOOT_IMG_MANAGER=y
+CONFIG_IMG_MANAGER=y
+
+# Flash and Stream Configuration (required for IMG_MANAGER)
+CONFIG_FLASH=y
+CONFIG_STREAM_FLASH=y
+
+# Retention system
+CONFIG_RETENTION=y
+CONFIG_RETENTION_BOOT_MODE=y
+CONFIG_RETAINED_MEM=y

software/apps/snippets/bootloader/src/main.c

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+#include <zephyr/kernel.h>
+#include <app_version.h>
+#include <zephyr/shell/shell.h>
+#include <zephyr/sys/reboot.h>
+#include <zephyr/dfu/mcuboot.h>
+#include <zephyr/retention/bootmode.h>
+#include <stdlib.h>
+
+/* Shell command handler for "reset" */
+static int cmd_reset(const struct shell *sh, size_t argc, char **argv)
+{
+    shell_print(sh, "Rebooting system...");
+    k_sleep(K_MSEC(100)); // Optional delay for user to see the message
+    sys_reboot(SYS_REBOOT_WARM);
+    return 0;
+}
+
+static int cmd_download(const struct shell *sh, size_t argc, char **argv)
+{
+    int rc;
+    
+    /* Set boot mode to serial recovery */
+    rc = bootmode_set(BOOT_MODE_TYPE_BOOTLOADER);
+    if (rc < 0) {
+        shell_error(sh, "Failed to set boot mode: %d", rc);
+        return rc;
+    }
+    
+    shell_print(sh, "Boot mode set to recovery. Rebooting to bootloader...");
+    k_sleep(K_MSEC(100));
+    sys_reboot(SYS_REBOOT_WARM);
+    return 0;
+}
+
+/* Register the shell command */
+SHELL_CMD_REGISTER(reset, NULL, "Reboot the system", cmd_reset);
+SHELL_CMD_REGISTER(download, NULL, "Download firmware", cmd_download);
+
+int main(void){
+    printk("Bootloader test version %s\n", APP_VERSION_EXTENDED_STRING);
+    return 0;
+}

software/apps/snippets/bootloader/sysbuild.conf

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+# Sysbuild configuration for firmware_node with MCUboot
+
+# Enable MCUboot as bootloader
+SB_CONFIG_BOOTLOADER_MCUBOOT=y
+SB_CONFIG_MCUBOOT_MODE_SINGLE_APP=y

software/apps/snippets/bootloader/sysbuild/bootloader.overlay

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+/*
+ * Copyright (c) 2021 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "flash_partitions_128kb.dtsi"
+
+/ {
+	chosen {
+		zephyr,code-partition = &slot0_partition;
+	};
+};

software/apps/snippets/bootloader/sysbuild/flash_partitions_128kb.dtsi

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+/*
+ * Devicetree Overlay for 128KB Flash
+ * - MCUboot Bootloader (32KB)
+ * - Application Slot (96KB)
+ */
+
+&flash0 {
+        /delete-node/ partitions;
+        partitions {
+                compatible = "fixed-partitions";
+                #address-cells = <1>;
+                #size-cells = <1>;
+
+                boot_partition: partition@0 {
+                        label = "mcuboot";
+                        reg = <0x00000000 DT_SIZE_K(32)>;
+                        read-only;
+                };
+
+                slot0_partition: partition@8000 {
+                        label = "image-0";
+                        reg = <0x00008000 DT_SIZE_K(96)>;
+                };
+        };
+};
+
+/* Add retention memory to the existing SRAM node */
+&sram0 {
+        #address-cells = <1>;
+        #size-cells = <1>;
+        
+        retainedmem {
+                compatible = "zephyr,retained-ram";
+                status = "okay";
+                #address-cells = <1>;
+                #size-cells = <1>;
+                
+                boot_mode: retention@7f00 {
+                        compatible = "zephyr,retention";
+                        status = "okay";
+                        reg = <0x7f00 0x100>;
+                        prefix = [08 04];
+                        checksum = <1>;
+                };
+        };
+};
+
+/ {
+        chosen {
+                zephyr,boot-mode = &boot_mode;
+                zephyr,console = &cdc_acm_uart0;
+    };
+};
+
+&zephyr_udc0 {
+    status = "okay";
+    
+    cdc_acm_uart0: cdc_acm_uart0 {
+        compatible = "zephyr,cdc-acm-uart";
+        label = "CDC_ACM_0";
+    };
+};

software/apps/snippets/bootloader/sysbuild/mcuboot.conf

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+#
+# MCUboot Configuration for Serial Recovery over USB-CDC
+#
+
+# Enables serial recovery mode in MCUboot.
+CONFIG_MCUBOOT_SERIAL=y
+
+# Tell MCUboot to check for a trigger to enter recovery
+CONFIG_BOOT_SERIAL_BOOT_MODE=y
+
+# --- USB Stack Configuration ---
+CONFIG_USB_DEVICE_STACK=y
+CONFIG_USB_DEVICE_PRODUCT="MCUboot Serial Recovery"
+
+# Use USB CDC ACM for MCUboot serial recovery (not UART)
+CONFIG_BOOT_SERIAL_CDC_ACM=y
+
+# --- Disable Zephyr Console to avoid conflicts ---
+# MCUboot's serial_adapter doesn't work well with the general console subsystem.
+CONFIG_UART_CONSOLE=n
+CONFIG_CONSOLE_HANDLER=n
+CONFIG_CONSOLE=n
+
+# --- Flash and Stream Configuration (required for IMG_MANAGER) ---
+CONFIG_FLASH=y
+CONFIG_STREAM_FLASH=y
+
+# --- mcumgr Configuration ---
+# MCUMGR requires NET_BUF, even for serial transport.
+CONFIG_NET_BUF=y
+CONFIG_NET_LOG=n
+
+# Enables the mcumgr library and necessary command handlers
+CONFIG_MCUMGR=y
+CONFIG_IMG_MANAGER=y
+CONFIG_MCUMGR_GRP_IMG=y
+CONFIG_MCUMGR_GRP_OS=y
+
+# --- Retention Configuration ---
+CONFIG_RETAINED_MEM=y
+CONFIG_RETENTION=y
+CONFIG_RETENTION_BOOT_MODE=y
+
+# --- Optional: Reduce memory usage ---
+CONFIG_MAIN_STACK_SIZE=2048
+CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=1024

software/apps/snippets/bootloader/sysbuild/mcuboot.overlay

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+#include "flash_partitions_128kb.dtsi"
+
+/ {
+    chosen {
+        zephyr,code-partition = &boot_partition;
+        zephyr,console = &cdc_acm_uart0;
+    };
+};
+
+&zephyr_udc0 {
+    status = "okay";
+    
+    cdc_acm_uart0: cdc_acm_uart0 {
+        compatible = "zephyr,cdc-acm-uart";
+        label = "CDC_ACM_0";
+    };
+};