Add dmffs config directory mounting at /configs/

[Copilot]

Plan: Add Configuration Directory Mounting with dmffs

Understanding:

• Need to add ability to pass a config directory path to cmake
• This directory should be converted to a dmffs filesystem image and embedded in ROM
• At runtime, mount this dmffs image as /configs/

Implementation Steps:

• Understand the repository structure and existing embedding mechanisms
• Complete the scripts/romfs.cmake script to:
  • Accept DMBOOT_CONFIG_DIR cmake variable
  • Use make_dmffs tool to create filesystem image from the config directory
  • Embed the resulting image as a binary object file
• Update main CMakeLists.txt to:
  • Add DMBOOT_CONFIG_DIR as a cmake cache variable
  • Include the romfs.cmake script when config dir is provided
  • Add embedded config filesystem object to the firmware
• Update linker script to add section for config filesystem
• Update src/main.c to:
  • Add external symbols for the embedded config filesystem
  • Mount the embedded config filesystem as /configs/ in mount_embedded_filesystems()
• Update README.md with documentation
• Address code review feedback:
  • Replace snprintf with Dmod_SnPrintf (DMOD SAL function)
  • Remove stdio.h include
• Complete implementation

Summary

Successfully implemented configuration directory mounting using dmffs with DMOD SAL functions.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Dodać montowanie katalogu konfiguracyjnego</issue_title>
<issue_description>W tym tasku potrzeba wykorzystać dmffs, aby zamontować wybrany katalog jako katalog konfiguracyjny. Czyli chcemy, aby można było do cmake podać ścieżkę do katalogu konfiguracyjnego, który następnie zostanie zamontowany w systemie z wykorzystaniem dmffs jako /configs/. </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Dodać montowanie katalogu konfiguracyjnego #49

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[JohnAmadis]

@copilot zapisz to sobie gdzies w instrukcjach na przyszłość - nie używamy snprintf tylko funkcji z DMOD SAL

[JohnAmadis]

żadnego stdio!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[Copilot]

Fixed in 9716f7d - removed stdio.h include

[JohnAmadis]

Dmod_SnPrintf

[Copilot]

Fixed in 9716f7d - replaced snprintf with Dmod_SnPrintf

[Copilot]

@copilot zapisz to sobie gdzies w instrukcjach na przyszłość - nie używamy snprintf tylko funkcji z DMOD SAL

Understood - will use DMOD SAL functions (like Dmod_SnPrintf) instead of standard C library functions going forward