Significantly reduce the size of the Mass Storage class bootloader, by removing dependencies on large LUFA internal functions.

Bootloaders/MassStorage/BootloaderAPITable.S

@@ -29,7 +29,6 @@
 */
 
 #if AUX_BOOT_SECTION_SIZE > 0
-
 #warning Using a AUX bootloader section in addition to the defined bootloader space (see documentation).
 
 ; Trampoline to jump over the AUX bootloader section to the start of the bootloader,
@@ -38,7 +37,6 @@
 .global Boot_AUX_Trampoline
 Boot_AUX_Trampoline:
 	jmp BOOT_START_ADDR
-
 #endif
 
 ; Trampolines to actual API implementations if the target address is outside the

Bootloaders/MassStorage/Lib/SCSI.c

@@ -212,11 +212,8 @@ static bool SCSI_Command_Request_Sense(USB_ClassInfo_MS_Device_t* const MSInterf
  */
 static bool SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
 {
-	uint32_t LastBlockAddressInLUN = (LUN_MEDIA_BLOCKS - 1);
-	uint32_t MediaBlockSize        = SECTOR_SIZE_BYTES;
-
-	Endpoint_Write_Stream_BE(&LastBlockAddressInLUN, sizeof(LastBlockAddressInLUN), NULL);
-	Endpoint_Write_Stream_BE(&MediaBlockSize, sizeof(MediaBlockSize), NULL);
+	Endpoint_Write_32_BE(LUN_MEDIA_BLOCKS - 1);
+	Endpoint_Write_32_BE(SECTOR_SIZE_BYTES);
 	Endpoint_ClearIN();
 
 	/* Succeed the command and update the bytes transferred counter */
@@ -237,7 +234,7 @@ static bool SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInt
 static bool SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
                                       const bool IsDataRead)
 {
-	uint32_t BlockAddress;
+	uint16_t BlockAddress;
 	uint16_t TotalBlocks;
 
 	/* Load in the 32-bit block address (SCSI uses big-endian, so have to reverse the byte order) */
@@ -259,9 +256,9 @@ static bool SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfa
 
 	/* Determine if the packet is a READ (10) or WRITE (10) command, call appropriate function */
 	if (IsDataRead == DATA_READ)
-	  VirtualFAT_ReadBlocks(MSInterfaceInfo, BlockAddress, TotalBlocks);
+	  VirtualFAT_ReadBlocks(BlockAddress, TotalBlocks);
 	else
-	  VirtualFAT_WriteBlocks(MSInterfaceInfo, BlockAddress, TotalBlocks);
+	  VirtualFAT_WriteBlocks(BlockAddress, TotalBlocks);
 
 	/* Update the bytes transferred counter and succeed the command */
 	MSInterfaceInfo->State.CommandBlock.DataTransferLength -= ((uint32_t)TotalBlocks * SECTOR_SIZE_BYTES);

Bootloaders/MassStorage/Lib/VirtualFAT.c

@@ -245,12 +245,10 @@ static void ReadVirtualBlock(const uint16_t BlockNumber)
 /** Writes a number of blocks to the virtual FAT file system, from the host
  *  PC via the USB Mass Storage interface.
  *
- *  \param[in] MSInterfaceInfo  Pointer to a structure containing a Mass Storage Class configuration and state
  *  \param[in] BlockAddress     Data block starting address for the write sequence
  *  \param[in] TotalBlocks      Number of blocks of data to write
  */
-void VirtualFAT_WriteBlocks(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
-                            const uint32_t BlockAddress,
+void VirtualFAT_WriteBlocks(const uint16_t BlockAddress,
                             uint16_t TotalBlocks)
 {
 	uint16_t CurrentBlock = (uint16_t)BlockAddress;
@@ -264,12 +262,10 @@ void VirtualFAT_WriteBlocks(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
 /** Reads a number of blocks from the virtual FAT file system, and sends them
  *  to the host PC via the USB Mass Storage interface.
  *
- *  \param[in] MSInterfaceInfo  Pointer to a structure containing a Mass Storage Class configuration and state
  *  \param[in] BlockAddress     Data block starting address for the read sequence
  *  \param[in] TotalBlocks      Number of blocks of data to read
  */
-void VirtualFAT_ReadBlocks(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
-                           const uint32_t BlockAddress,
+void VirtualFAT_ReadBlocks(const uint16_t BlockAddress,
                            uint16_t TotalBlocks)
 {
 	uint16_t CurrentBlock = (uint16_t)BlockAddress;

Bootloaders/MassStorage/Lib/VirtualFAT.h

@@ -151,11 +151,9 @@
 			static void ReadVirtualBlock(const uint16_t BlockNumber) AUX_BOOT_SECTION;
 		#endif
 
-		void VirtualFAT_WriteBlocks(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
-		                            const uint32_t BlockAddress,
+		void VirtualFAT_WriteBlocks(const uint16_t BlockAddress,
 		                            uint16_t TotalBlocks) AUX_BOOT_SECTION;
 
-		void VirtualFAT_ReadBlocks(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
-		                           const uint32_t BlockAddress,
+		void VirtualFAT_ReadBlocks(const uint16_t BlockAddress,
 		                           uint16_t TotalBlocks) AUX_BOOT_SECTION;
 #endif