Minor fixes (#2833)

- Fix FlashString coding style
- UPnP operator== not const
- Tidy rp2040 build.mk
- Fix comments in `FileSystem.h` referring to Spiffs

Sming/Arch/Rp2040/build.mk

@@ -9,7 +9,8 @@ CPPFLAGS += \
 	-DARDUINO_ARCH_RP2040 \
 	-march=armv6-m \
 	-mcpu=cortex-m0plus \
-	-mthumb
+	-mthumb \
+	-nostdlib
 
 CXXFLAGS += \
 	-fno-threadsafe-statics \
@@ -43,8 +44,5 @@ OBJCOPY		 	:= $(TOOLSPEC)objcopy
 OBJDUMP		 	:= $(TOOLSPEC)objdump
 GDB				:= gdb
 
-CPPFLAGS += \
-	-nostdlib
-
 # => Tools
 MEMANALYZER = $(PYTHON) $(ARCH_TOOLS)/memanalyzer.py $(OBJDUMP)$(TOOL_EXT)

Sming/Core/FileSystem.h

@@ -96,7 +96,7 @@ bool fileMountFileSystem(IFS::IFileSystem* fs);
 bool fwfs_mount();
 
 /**
- * @brief Mount SPIFFS volume from a specific partition
+ * @brief Mount FWFS volume from a specific partition
  * @retval bool true on success
  */
 bool fwfs_mount(Storage::Partition partition);
@@ -256,8 +256,6 @@ template <typename TFileName> inline file_size_t fileGetSize(const TFileName& fi
  *  @param file Open file handle, must have Write access
  *  @param newSize
  *  @retval int Error code
- *  @note In POSIX `ftruncate()` can also make the file bigger, however SPIFFS can only
- *  reduce the file size and will return an error if newSize > fileSize
  */
 inline int fileTruncate(FileHandle file, file_size_t newSize)
 {
@@ -279,8 +277,6 @@ inline int fileTruncate(FileHandle file)
  *  @param fileName
  *  @param newSize
  *  @retval int Error code
- *  @note In POSIX `truncate()` can also make the file bigger, however SPIFFS can only
- *  reduce the file size and will return an error if newSize > fileSize
  */
 template <typename TFileName> int fileTruncate(const TFileName& fileName, file_size_t newSize)
 {
@@ -342,7 +338,7 @@ template <typename TFileName> inline size_t fileGetContent(const TFileName& file
 
 /** @brief  Get file statistics
  *  @param  name File name
- *  @param  stat Pointer to SPIFFS statistic structure to populate
+ *  @param  stat Pointer to statistic structure to populate
  *  @retval int Error code
  */
 inline int fileStats(const char* fileName, FileStat& stat)
@@ -358,7 +354,7 @@ inline int fileStats(const String& fileName, FileStat& stat)
 
 /** brief   Get file statistics
  *  @param  file File handle
- *  @param  stat Pointer to SPIFFS statistic structure to populate
+ *  @param  stat Pointer to statistic structure to populate
  *  @retval int Error code
  */
 inline int fileStats(FileHandle file, FileStat& stat)