Default config directory to build/configs and auto-download config files

CMakeLists.txt

@@ -9,7 +9,7 @@ cmake_minimum_required(VERSION 3.10)
 set(TARGET "STM32F746xG" CACHE STRING "Target microcontroller")
 set(STARTUP_DMP_FILE "" CACHE FILEPATH "Optional startup.dmp file to embed in ROM")
 set(USER_DATA_FILE "" CACHE FILEPATH "Optional user_data file to embed in ROM")
-set(DMBOOT_CONFIG_DIR "" CACHE PATH "Optional config directory to mount as /configs/ using dmffs")
+set(DMBOOT_CONFIG_DIR "${CMAKE_BINARY_DIR}/configs" CACHE PATH "Config directory to mount as /configs/ using dmffs (defaults to build/configs)")
 option(DMBOOT_EMULATION "Enable Renode emulation mode" OFF)
 
 # ======================================================================
@@ -79,11 +79,6 @@ endif()
 include(scripts/romfs.cmake)
 if(CONFIG_FS_OBJECT)
     list(APPEND EMBEDDED_OBJECTS "${CONFIG_FS_OBJECT}")
-    # Add dependency on the filesystem generation
-    add_custom_command(
-        OUTPUT "${CONFIG_FS_OBJECT}"
-        DEPENDS generate_config_fs
-    )
 endif()
 
 # Embed modules.dmp if it exists after build

README.md

@@ -45,7 +45,7 @@ cmake --build build
 **Build Parameters:**
 - `STARTUP_DMP_FILE` (optional) - Path to a startup package file (`.dmp`) that will be automatically loaded using `Dmod_AddPackageBuffer` at boot
 - `USER_DATA_FILE` (optional) - Path to a user data file that will be embedded in ROM, with its address and size available via environment variables `USER_DATA_ADDR` and `USER_DATA_SIZE`
-- `DMBOOT_CONFIG_DIR` (optional) - Path to a directory that will be converted to a dmffs filesystem image and mounted at `/configs/` at boot time
+- `DMBOOT_CONFIG_DIR` (optional, defaults to `build/configs`) - Path to a directory that will be converted to a dmffs filesystem image and mounted at `/configs/` at boot time. By default, configuration files from `modules.dmd` are downloaded to this directory.
 - `DMBOOT_EMULATION` (optional) - Enable Renode simulation mode instead of hardware mode
 
 **Automatic Build-Time Embedding:**

modules/CMakeLists.txt

@@ -26,6 +26,28 @@ if(EXISTS "${DMBOOT_MODULES_DMD}")
 else()
     message(WARNING "Modules DMD file not found at ${DMBOOT_MODULES_DMD}. Skipping module download.")
 endif()
+
+# ======================================================================
+#               Downloading configuration files from DMD 
+# ======================================================================
+set(DMBOOT_CONFIGS_MARKER_FILE "${DMBOOT_CONFIG_DIR}/.download_complete")
+if(EXISTS "${DMBOOT_MODULES_DMD}")
+    add_custom_command(
+        OUTPUT "${DMBOOT_CONFIGS_MARKER_FILE}"
+        COMMAND ${CMAKE_COMMAND} -E make_directory "${DMBOOT_CONFIG_DIR}"
+        COMMAND ${CMAKE_COMMAND} -E echo "Downloading configuration files to ${DMBOOT_CONFIG_DIR}..."
+        COMMAND ${DMF_GET} -d "${DMBOOT_MODULES_DMD}" -o "${DMBOOT_CONFIG_DIR}" -t "${DMOD_TOOLS_NAME}" --cpu-family "${DMBOOT_MCU_SERIES}" -y --type dmfc
+        COMMAND ${CMAKE_COMMAND} -E touch "${DMBOOT_CONFIGS_MARKER_FILE}"
+        DEPENDS "${DMBOOT_MODULES_DMD}"
+        COMMENT "Downloading configuration files specified in ${DMBOOT_MODULES_DMD} from DMD..."
+        VERBATIM
+    )
+    add_custom_target(download_configs ALL
+        DEPENDS "${DMBOOT_CONFIGS_MARKER_FILE}"
+    )
+else()
+    message(WARNING "Modules DMD file not found at ${DMBOOT_MODULES_DMD}. Skipping config download.")
+endif()
 
 # ======================================================================
 #               Preparing dmp file from modules

scripts/romfs.cmake

@@ -1,8 +1,10 @@
 # This script sets up a ROM filesystem using dmffs and integrates it into the build
 # It checks for the required tools, creates the ROMFS image, and embeds it into the firmware
 
-# Check if DMBOOT_CONFIG_DIR is set and exists
-if(DMBOOT_CONFIG_DIR AND EXISTS "${DMBOOT_CONFIG_DIR}")
+# Check if DMBOOT_CONFIG_DIR is set
+if(DMBOOT_CONFIG_DIR)
+    # Create the directory if it doesn't exist
+    file(MAKE_DIRECTORY "${DMBOOT_CONFIG_DIR}")
     message(STATUS "Config directory specified: ${DMBOOT_CONFIG_DIR}")
 
     # Set output path for the config filesystem image
@@ -41,8 +43,8 @@ if(DMBOOT_CONFIG_DIR AND EXISTS "${DMBOOT_CONFIG_DIR}")
     # Create custom command to generate the config filesystem image
     add_custom_command(
         OUTPUT "${CONFIG_FS_IMAGE}"
-        COMMAND ${MAKE_DMFFS_COMMAND} -d "${DMBOOT_CONFIG_DIR}" -o "${CONFIG_FS_IMAGE}"
-        DEPENDS "${DMBOOT_CONFIG_DIR}"
+        COMMAND ${MAKE_DMFFS_COMMAND} "${DMBOOT_CONFIG_DIR}" "${CONFIG_FS_IMAGE}"
+        DEPENDS "${DMBOOT_CONFIG_DIR}" download_configs
         COMMENT "Creating config filesystem image from ${DMBOOT_CONFIG_DIR}"
         VERBATIM
     )
@@ -52,20 +54,27 @@ if(DMBOOT_CONFIG_DIR AND EXISTS "${DMBOOT_CONFIG_DIR}")
         DEPENDS "${CONFIG_FS_IMAGE}"
     )
 
-    # Embed the config filesystem image
-    embed_binary_file(
-        INPUT_FILE "${CONFIG_FS_IMAGE}"
-        SECTION_NAME ".embedded.config_fs"
-        SYMBOL_PREFIX "__config_fs"
-    )
-
+    # Create custom command to embed the config filesystem image (similar to modules.dmp approach)
     set(CONFIG_FS_OBJECT "${CMAKE_BINARY_DIR}/__config_fs.o")
+    add_custom_command(
+        OUTPUT "${CONFIG_FS_OBJECT}"
+        COMMAND ${CMAKE_OBJCOPY}
+            --input-target=binary
+            --output-target=elf32-littlearm
+            --binary-architecture=arm
+            --rename-section .data=.embedded.config_fs,alloc,load,readonly,data,contents
+            "${CONFIG_FS_IMAGE}"
+            "${CONFIG_FS_OBJECT}"
+        DEPENDS "${CONFIG_FS_IMAGE}"
+        COMMENT "Embedding config filesystem into section .embedded.config_fs"
+        VERBATIM
+    )
 
     # Export variables to parent scope
     set(CONFIG_FS_OBJECT "${CONFIG_FS_OBJECT}" PARENT_SCOPE)
     set(CONFIG_FS_IMAGE "${CONFIG_FS_IMAGE}" PARENT_SCOPE)
 
     message(STATUS "Config filesystem will be embedded from: ${DMBOOT_CONFIG_DIR}")
 else()
-    message(STATUS "No config directory specified (DMBOOT_CONFIG_DIR not set or doesn't exist)")
+    message(STATUS "No config directory specified (DMBOOT_CONFIG_DIR not set)")
 endif()