Merge commit '60b30c036397cb5627fa374bb930794b225daa29' as 'lib/lufa'

4 files changed, 1162 insertions, 0 deletions

diff --git a/lib/lufa/Bootloaders/MassStorage/Lib/SCSI.c b/lib/lufa/Bootloaders/MassStorage/Lib/SCSI.c
new file mode 100644
index 000000000..3c14eb901
--- /dev/null
+++ b/lib/lufa/Bootloaders/MassStorage/Lib/SCSI.c
@@ -0,0 +1,294 @@
+/*
+             LUFA Library
+     Copyright (C) Dean Camera, 2017.
+
+  dean [at] fourwalledcubicle [dot] com
+           www.lufa-lib.org
+*/
+
+/*
+  Copyright 2017  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+  Permission to use, copy, modify, distribute, and sell this
+  software and its documentation for any purpose is hereby granted
+  without fee, provided that the above copyright notice appear in
+  all copies and that both that the copyright notice and this
+  permission notice and warranty disclaimer appear in supporting
+  documentation, and that the name of the author not be used in
+  advertising or publicity pertaining to distribution of the
+  software without specific, written prior permission.
+
+  The author disclaims all warranties with regard to this
+  software, including all implied warranties of merchantability
+  and fitness.  In no event shall the author be liable for any
+  special, indirect or consequential damages or any damages
+  whatsoever resulting from loss of use, data or profits, whether
+  in an action of contract, negligence or other tortious action,
+  arising out of or in connection with the use or performance of
+  this software.
+*/
+
+/** \file
+ *
+ *  SCSI command processing routines, for SCSI commands issued by the host. Mass Storage
+ *  devices use a thin "Bulk-Only Transport" protocol for issuing commands and status information,
+ *  which wrap around standard SCSI device commands for controlling the actual storage medium.
+ */
+
+#define  INCLUDE_FROM_SCSI_C
+#include "SCSI.h"
+
+/** Structure to hold the SCSI response data to a SCSI INQUIRY command. This gives information about the device's
+ *  features and capabilities.
+ */
+static const SCSI_Inquiry_Response_t InquiryData =
+	{
+		.DeviceType          = DEVICE_TYPE_BLOCK,
+		.PeripheralQualifier = 0,
+
+		.Removable           = true,
+
+		.Version             = 0,
+
+		.ResponseDataFormat  = 2,
+		.NormACA             = false,
+		.TrmTsk              = false,
+		.AERC                = false,
+
+		.AdditionalLength    = 0x1F,
+
+		.SoftReset           = false,
+		.CmdQue              = false,
+		.Linked              = false,
+		.Sync                = false,
+		.WideBus16Bit        = false,
+		.WideBus32Bit        = false,
+		.RelAddr             = false,
+
+		.VendorID            = "LUFA",
+		.ProductID           = "Bootloader",
+		.RevisionID          = {'0','.','0','0'},
+	};
+
+/** Structure to hold the sense data for the last issued SCSI command, which is returned to the host after a SCSI REQUEST SENSE
+ *  command is issued. This gives information on exactly why the last command failed to complete.
+ */
+static SCSI_Request_Sense_Response_t SenseData =
+	{
+		.ResponseCode        = 0x70,
+		.AdditionalLength    = 0x0A,
+	};
+
+
+/** Main routine to process the SCSI command located in the Command Block Wrapper read from the host. This dispatches
+ *  to the appropriate SCSI command handling routine if the issued command is supported by the device, else it returns
+ *  a command failure due to a ILLEGAL REQUEST.
+ *
+ *  \param[in] MSInterfaceInfo  Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ *  \return Boolean \c true if the command completed successfully, \c false otherwise
+ */
+bool SCSI_DecodeSCSICommand(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+{
+	bool CommandSuccess = false;
+
+	/* Run the appropriate SCSI command hander function based on the passed command */
+	switch (MSInterfaceInfo->State.CommandBlock.SCSICommandData[0])
+	{
+		case SCSI_CMD_INQUIRY:
+			CommandSuccess = SCSI_Command_Inquiry(MSInterfaceInfo);
+			break;
+		case SCSI_CMD_REQUEST_SENSE:
+			CommandSuccess = SCSI_Command_Request_Sense(MSInterfaceInfo);
+			break;
+		case SCSI_CMD_READ_CAPACITY_10:
+			CommandSuccess = SCSI_Command_Read_Capacity_10(MSInterfaceInfo);
+			break;
+		case SCSI_CMD_WRITE_10:
+			CommandSuccess = SCSI_Command_ReadWrite_10(MSInterfaceInfo, DATA_WRITE);
+			break;
+		case SCSI_CMD_READ_10:
+			CommandSuccess = SCSI_Command_ReadWrite_10(MSInterfaceInfo, DATA_READ);
+			break;
+		case SCSI_CMD_MODE_SENSE_6:
+			CommandSuccess = SCSI_Command_ModeSense_6(MSInterfaceInfo);
+			break;
+		case SCSI_CMD_START_STOP_UNIT:
+#if !defined(NO_APP_START_ON_EJECT)
+			/* If the user ejected the volume, signal bootloader exit at next opportunity. */
+			RunBootloader = ((MSInterfaceInfo->State.CommandBlock.SCSICommandData[4] & 0x03) != 0x02);
+#endif
+		case SCSI_CMD_SEND_DIAGNOSTIC:
+		case SCSI_CMD_TEST_UNIT_READY:
+		case SCSI_CMD_PREVENT_ALLOW_MEDIUM_REMOVAL:
+		case SCSI_CMD_VERIFY_10:
+			/* These commands should just succeed, no handling required */
+			CommandSuccess = true;
+			MSInterfaceInfo->State.CommandBlock.DataTransferLength = 0;
+			break;
+		default:
+			/* Update the SENSE key to reflect the invalid command */
+			SCSI_SET_SENSE(SCSI_SENSE_KEY_ILLEGAL_REQUEST,
+		                   SCSI_ASENSE_INVALID_COMMAND,
+		                   SCSI_ASENSEQ_NO_QUALIFIER);
+			break;
+	}
+
+	/* Check if command was successfully processed */
+	if (CommandSuccess)
+	{
+		SCSI_SET_SENSE(SCSI_SENSE_KEY_GOOD,
+		               SCSI_ASENSE_NO_ADDITIONAL_INFORMATION,
+		               SCSI_ASENSEQ_NO_QUALIFIER);
+
+		return true;
+	}
+
+	return false;
+}
+
+/** Command processing for an issued SCSI INQUIRY command. This command returns information about the device's features
+ *  and capabilities to the host.
+ *
+ *  \param[in] MSInterfaceInfo  Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ *  \return Boolean \c true if the command completed successfully, \c false otherwise.
+ */
+static bool SCSI_Command_Inquiry(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+{
+	uint16_t AllocationLength  = SwapEndian_16(*(uint16_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[3]);
+	uint16_t BytesTransferred  = MIN(AllocationLength, sizeof(InquiryData));
+
+	/* Only the standard INQUIRY data is supported, check if any optional INQUIRY bits set */
+	if ((MSInterfaceInfo->State.CommandBlock.SCSICommandData[1] & ((1 << 0) | (1 << 1))) ||
+	     MSInterfaceInfo->State.CommandBlock.SCSICommandData[2])
+	{
+		/* Optional but unsupported bits set - update the SENSE key and fail the request */
+		SCSI_SET_SENSE(SCSI_SENSE_KEY_ILLEGAL_REQUEST,
+		               SCSI_ASENSE_INVALID_FIELD_IN_CDB,
+		               SCSI_ASENSEQ_NO_QUALIFIER);
+
+		return false;
+	}
+
+	Endpoint_Write_Stream_LE(&InquiryData, BytesTransferred, NULL);
+
+	/* Pad out remaining bytes with 0x00 */
+	Endpoint_Null_Stream((AllocationLength - BytesTransferred), NULL);
+
+	/* Finalize the stream transfer to send the last packet */
+	Endpoint_ClearIN();
+
+	/* Succeed the command and update the bytes transferred counter */
+	MSInterfaceInfo->State.CommandBlock.DataTransferLength -= BytesTransferred;
+
+	return true;
+}
+
+/** Command processing for an issued SCSI REQUEST SENSE command. This command returns information about the last issued command,
+ *  including the error code and additional error information so that the host can determine why a command failed to complete.
+ *
+ *  \param[in] MSInterfaceInfo  Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ *  \return Boolean \c true if the command completed successfully, \c false otherwise.
+ */
+static bool SCSI_Command_Request_Sense(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+{
+	uint8_t AllocationLength = MSInterfaceInfo->State.CommandBlock.SCSICommandData[4];
+	uint8_t BytesTransferred = MIN(AllocationLength, sizeof(SenseData));
+
+	Endpoint_Write_Stream_LE(&SenseData, BytesTransferred, NULL);
+	Endpoint_Null_Stream((AllocationLength - BytesTransferred), NULL);
+	Endpoint_ClearIN();
+
+	/* Succeed the command and update the bytes transferred counter */
+	MSInterfaceInfo->State.CommandBlock.DataTransferLength -= BytesTransferred;
+
+	return true;
+}
+
+/** Command processing for an issued SCSI READ CAPACITY (10) command. This command returns information about the device's capacity
+ *  on the selected Logical Unit (drive), as a number of OS-sized blocks.
+ *
+ *  \param[in] MSInterfaceInfo  Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ *  \return Boolean \c true if the command completed successfully, \c false otherwise.
+ */
+static bool SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+{
+	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 */
+	MSInterfaceInfo->State.CommandBlock.DataTransferLength -= 8;
+
+	return true;
+}
+
+/** Command processing for an issued SCSI READ (10) or WRITE (10) command. This command reads in the block start address
+ *  and total number of blocks to process, then calls the appropriate low-level Dataflash routine to handle the actual
+ *  reading and writing of the data.
+ *
+ *  \param[in] MSInterfaceInfo  Pointer to the Mass Storage class interface structure that the command is associated with
+ *  \param[in] IsDataRead  Indicates if the command is a READ (10) command or WRITE (10) command (DATA_READ or DATA_WRITE)
+ *
+ *  \return Boolean \c true if the command completed successfully, \c false otherwise.
+ */
+static bool SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
+                                      const bool IsDataRead)
+{
+	uint16_t BlockAddress;
+	uint16_t TotalBlocks;
+
+	/* Load in the 32-bit block address (SCSI uses big-endian, so have to reverse the byte order) */
+	BlockAddress = SwapEndian_32(*(uint32_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[2]);
+
+	/* Load in the 16-bit total blocks (SCSI uses big-endian, so have to reverse the byte order) */
+	TotalBlocks  = SwapEndian_16(*(uint16_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[7]);
+
+	/* Check if the block address is outside the maximum allowable value for the LUN */
+	if (BlockAddress >= LUN_MEDIA_BLOCKS)
+	{
+		/* Block address is invalid, update SENSE key and return command fail */
+		SCSI_SET_SENSE(SCSI_SENSE_KEY_ILLEGAL_REQUEST,
+		               SCSI_ASENSE_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE,
+		               SCSI_ASENSEQ_NO_QUALIFIER);
+
+		return false;
+	}
+
+	/* Determine if the packet is a READ (10) or WRITE (10) command, call appropriate function */
+	for (uint16_t i = 0; i < TotalBlocks; i++)
+	{
+		if (IsDataRead == DATA_READ)
+		  VirtualFAT_ReadBlock(BlockAddress + i);
+		else
+		  VirtualFAT_WriteBlock(BlockAddress + i);
+	}
+
+	/* Update the bytes transferred counter and succeed the command */
+	MSInterfaceInfo->State.CommandBlock.DataTransferLength -= ((uint32_t)TotalBlocks * SECTOR_SIZE_BYTES);
+
+	return true;
+}
+
+/** Command processing for an issued SCSI MODE SENSE (6) command. This command returns various informational pages about
+ *  the SCSI device, as well as the device's Write Protect status.
+ *
+ *  \param[in] MSInterfaceInfo  Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ *  \return Boolean \c true if the command completed successfully, \c false otherwise.
+ */
+static bool SCSI_Command_ModeSense_6(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+{
+	/* Send an empty header response indicating Write Protect flag is off */
+	Endpoint_Write_32_LE(0);
+	Endpoint_ClearIN();
+
+	/* Update the bytes transferred counter and succeed the command */
+	MSInterfaceInfo->State.CommandBlock.DataTransferLength -= 4;
+
+	return true;
+}
+
diff --git a/lib/lufa/Bootloaders/MassStorage/Lib/SCSI.h b/lib/lufa/Bootloaders/MassStorage/Lib/SCSI.h
new file mode 100644
index 000000000..419559336
--- /dev/null
+++ b/lib/lufa/Bootloaders/MassStorage/Lib/SCSI.h
@@ -0,0 +1,84 @@
+/*
+             LUFA Library
+     Copyright (C) Dean Camera, 2017.
+
+  dean [at] fourwalledcubicle [dot] com
+           www.lufa-lib.org
+*/
+
+/*
+  Copyright 2017  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+  Permission to use, copy, modify, distribute, and sell this
+  software and its documentation for any purpose is hereby granted
+  without fee, provided that the above copyright notice appear in
+  all copies and that both that the copyright notice and this
+  permission notice and warranty disclaimer appear in supporting
+  documentation, and that the name of the author not be used in
+  advertising or publicity pertaining to distribution of the
+  software without specific, written prior permission.
+
+  The author disclaims all warranties with regard to this
+  software, including all implied warranties of merchantability
+  and fitness.  In no event shall the author be liable for any
+  special, indirect or consequential damages or any damages
+  whatsoever resulting from loss of use, data or profits, whether
+  in an action of contract, negligence or other tortious action,
+  arising out of or in connection with the use or performance of
+  this software.
+*/
+
+/** \file
+ *
+ *  Header file for SCSI.c.
+ */
+
+#ifndef _SCSI_H_
+#define _SCSI_H_
+
+	/* Includes: */
+		#include <avr/io.h>
+		#include <avr/pgmspace.h>
+
+		#include <LUFA/Drivers/USB/USB.h>
+
+		#include "../BootloaderMassStorage.h"
+		#include "../Descriptors.h"
+		#include "VirtualFAT.h"
+
+	/* Macros: */
+		/** Macro to set the current SCSI sense data to the given key, additional sense code and additional sense qualifier. This
+		 *  is for convenience, as it allows for all three sense values (returned upon request to the host to give information about
+		 *  the last command failure) in a quick and easy manner.
+		 *
+		 *  \param[in] Key    New SCSI sense key to set the sense code to
+		 *  \param[in] Acode  New SCSI additional sense key to set the additional sense code to
+		 *  \param[in] Aqual  New SCSI additional sense key qualifier to set the additional sense qualifier code to
+		 */
+		#define SCSI_SET_SENSE(Key, Acode, Aqual)  do { SenseData.SenseKey                 = (Key);   \
+		                                                SenseData.AdditionalSenseCode      = (Acode); \
+		                                                SenseData.AdditionalSenseQualifier = (Aqual); } while (0)
+
+		/** Macro for the \ref SCSI_Command_ReadWrite_10() function, to indicate that data is to be read from the storage medium. */
+		#define DATA_READ           true
+
+		/** Macro for the \ref SCSI_Command_ReadWrite_10() function, to indicate that data is to be written to the storage medium. */
+		#define DATA_WRITE          false
+
+		/** Value for the DeviceType entry in the SCSI_Inquiry_Response_t enum, indicating a Block Media device. */
+		#define DEVICE_TYPE_BLOCK   0x00
+
+	/* Function Prototypes: */
+		bool SCSI_DecodeSCSICommand(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo) AUX_BOOT_SECTION;
+
+		#if defined(INCLUDE_FROM_SCSI_C)
+			static bool SCSI_Command_Inquiry(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo) AUX_BOOT_SECTION;
+			static bool SCSI_Command_Request_Sense(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo) AUX_BOOT_SECTION;
+			static bool SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo) AUX_BOOT_SECTION;
+			static bool SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
+			                                      const bool IsDataRead) AUX_BOOT_SECTION;
+			static bool SCSI_Command_ModeSense_6(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo) AUX_BOOT_SECTION;
+		#endif
+
+#endif
+
diff --git a/lib/lufa/Bootloaders/MassStorage/Lib/VirtualFAT.c b/lib/lufa/Bootloaders/MassStorage/Lib/VirtualFAT.c
new file mode 100644
index 000000000..ffd453128
--- /dev/null
+++ b/lib/lufa/Bootloaders/MassStorage/Lib/VirtualFAT.c
@@ -0,0 +1,482 @@
+/*
+             LUFA Library
+     Copyright (C) Dean Camera, 2017.
+
+  dean [at] fourwalledcubicle [dot] com
+           www.lufa-lib.org
+*/
+
+/*
+  Copyright 2017  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+  Permission to use, copy, modify, distribute, and sell this
+  software and its documentation for any purpose is hereby granted
+  without fee, provided that the above copyright notice appear in
+  all copies and that both that the copyright notice and this
+  permission notice and warranty disclaimer appear in supporting
+  documentation, and that the name of the author not be used in
+  advertising or publicity pertaining to distribution of the
+  software without specific, written prior permission.
+
+  The author disclaims all warranties with regard to this
+  software, including all implied warranties of merchantability
+  and fitness.  In no event shall the author be liable for any
+  special, indirect or consequential damages or any damages
+  whatsoever resulting from loss of use, data or profits, whether
+  in an action of contract, negligence or other tortious action,
+  arising out of or in connection with the use or performance of
+  this software.
+*/
+
+/** \file
+ *
+ *  Virtualized FAT12 filesystem implementation, to perform self-programming
+ *  in response to read and write requests to the virtual filesystem by the
+ *  host PC.
+ */
+
+#define  INCLUDE_FROM_VIRTUAL_FAT_C
+#include "VirtualFAT.h"
+
+/** FAT filesystem boot sector block, must be the first sector on the physical
+ *  disk so that the host can identify the presence of a FAT filesystem. This
+ *  block is truncated; normally a large bootstrap section is located near the
+ *  end of the block for booting purposes however as this is not meant to be a
+ *  bootable disk it is omitted for space reasons.
+ *
+ *  \note When returning the boot block to the host, the magic signature 0xAA55
+ *        must be added to the very end of the block to identify it as a boot
+ *        block.
+ */
+static const FATBootBlock_t BootBlock =
+	{
+		.Bootstrap               = {0xEB, 0x3C, 0x90},
+		.Description             = "mkdosfs",
+		.SectorSize              = SECTOR_SIZE_BYTES,
+		.SectorsPerCluster       = SECTOR_PER_CLUSTER,
+		.ReservedSectors         = 1,
+		.FATCopies               = 2,
+		.RootDirectoryEntries    = (SECTOR_SIZE_BYTES / sizeof(FATDirectoryEntry_t)),
+		.TotalSectors16          = LUN_MEDIA_BLOCKS,
+		.MediaDescriptor         = 0xF8,
+		.SectorsPerFAT           = 1,
+		.SectorsPerTrack         = (LUN_MEDIA_BLOCKS % 64),
+		.Heads                   = (LUN_MEDIA_BLOCKS / 64),
+		.HiddenSectors           = 0,
+		.TotalSectors32          = 0,
+		.PhysicalDriveNum        = 0,
+		.ExtendedBootRecordSig   = 0x29,
+		.VolumeSerialNumber      = 0x12345678,
+		.VolumeLabel             = "LUFA BOOT  ",
+		.FilesystemIdentifier    = "FAT12   ",
+	};
+
+/** FAT 8.3 style directory entry, for the virtual FLASH contents file. */
+static FATDirectoryEntry_t FirmwareFileEntries[] =
+	{
+		/* Root volume label entry; disk label is contained in the Filename and
+		 * Extension fields (concatenated) with a special attribute flag - other
+		 * fields are ignored. Should be the same as the label in the boot block.
+		 */
+		[DISK_FILE_ENTRY_VolumeID] =
+		{
+			.MSDOS_Directory =
+				{
+					.Name            = "LUFA BOOT  ",
+					.Attributes      = FAT_FLAG_VOLUME_NAME,
+					.Reserved        = {0},
+					.CreationTime    = 0,
+					.CreationDate    = 0,
+					.StartingCluster = 0,
+					.Reserved2       = 0,
+				}
+		},
+
+		/* VFAT Long File Name entry for the virtual firmware file; required to
+		 * prevent corruption from systems that are unable to detect the device
+		 * as being a legacy MSDOS style FAT12 volume. */
+		[DISK_FILE_ENTRY_FLASH_LFN] =
+		{
+			.VFAT_LongFileName =
+				{
+					.Ordinal         = 1 | FAT_ORDINAL_LAST_ENTRY,
+					.Attribute       = FAT_FLAG_LONG_FILE_NAME,
+					.Reserved1       = 0,
+					.Reserved2       = 0,
+
+					.Checksum        = FAT_CHECKSUM('F','L','A','S','H',' ',' ',' ','B','I','N'),
+
+					.Unicode1        = 'F',
+					.Unicode2        = 'L',
+					.Unicode3        = 'A',
+					.Unicode4        = 'S',
+					.Unicode5        = 'H',
+					.Unicode6        = '.',
+					.Unicode7        = 'B',
+					.Unicode8        = 'I',
+					.Unicode9        = 'N',
+					.Unicode10       = 0,
+					.Unicode11       = 0,
+					.Unicode12       = 0,
+					.Unicode13       = 0,
+				}
+		},
+
+		/* MSDOS file entry for the virtual Firmware image. */
+		[DISK_FILE_ENTRY_FLASH_MSDOS] =
+		{
+			.MSDOS_File =
+				{
+					.Filename        = "FLASH   ",
+					.Extension       = "BIN",
+					.Attributes      = 0,
+					.Reserved        = {0},
+					.CreationTime    = FAT_TIME(1, 1, 0),
+					.CreationDate    = FAT_DATE(14, 2, 1989),
+					.StartingCluster = 2,
+					.FileSizeBytes   = FLASH_FILE_SIZE_BYTES,
+				}
+		},
+
+		[DISK_FILE_ENTRY_EEPROM_LFN] =
+		{
+			.VFAT_LongFileName =
+				{
+					.Ordinal         = 1 | FAT_ORDINAL_LAST_ENTRY,
+					.Attribute       = FAT_FLAG_LONG_FILE_NAME,
+					.Reserved1       = 0,
+					.Reserved2       = 0,
+
+					.Checksum        = FAT_CHECKSUM('E','E','P','R','O','M',' ',' ','B','I','N'),
+
+					.Unicode1        = 'E',
+					.Unicode2        = 'E',
+					.Unicode3        = 'P',
+					.Unicode4        = 'R',
+					.Unicode5        = 'O',
+					.Unicode6        = 'M',
+					.Unicode7        = '.',
+					.Unicode8        = 'B',
+					.Unicode9        = 'I',
+					.Unicode10       = 'N',
+					.Unicode11       = 0,
+					.Unicode12       = 0,
+					.Unicode13       = 0,
+				}
+		},
+
+		[DISK_FILE_ENTRY_EEPROM_MSDOS] =
+		{
+			.MSDOS_File =
+				{
+					.Filename        = "EEPROM  ",
+					.Extension       = "BIN",
+					.Attributes      = 0,
+					.Reserved        = {0},
+					.CreationTime    = FAT_TIME(1, 1, 0),
+					.CreationDate    = FAT_DATE(14, 2, 1989),
+					.StartingCluster = 2 + FILE_CLUSTERS(FLASH_FILE_SIZE_BYTES),
+					.FileSizeBytes   = EEPROM_FILE_SIZE_BYTES,
+				}
+		},
+	};
+
+/** Starting cluster of the virtual FLASH.BIN file on disk, tracked so that the
+ *  offset from the start of the data sector can be determined. On Windows
+ *  systems files are usually replaced using the original file's disk clusters,
+ *  while Linux appears to overwrite with an offset which must be compensated for.
+ */
+static const uint16_t* FLASHFileStartCluster  = &FirmwareFileEntries[DISK_FILE_ENTRY_FLASH_MSDOS].MSDOS_File.StartingCluster;
+
+/** Starting cluster of the virtual EEPROM.BIN file on disk, tracked so that the
+ *  offset from the start of the data sector can be determined. On Windows
+ *  systems files are usually replaced using the original file's disk clusters,
+ *  while Linux appears to overwrite with an offset which must be compensated for.
+ */
+static const uint16_t* EEPROMFileStartCluster = &FirmwareFileEntries[DISK_FILE_ENTRY_EEPROM_MSDOS].MSDOS_File.StartingCluster;
+
+/** Reads a byte of EEPROM out from the EEPROM memory space.
+ *
+ *  \note This function is required as the avr-libc EEPROM functions do not cope
+ *        with linker relaxations, and a jump longer than 4K of FLASH on the
+ *        larger USB AVRs will break the linker. This function is marked as
+ *        never inlinable and placed into the normal text segment so that the
+ *        call to the EEPROM function will be short even if the AUX boot section
+ *        is used.
+ *
+ *  \param[in]  Address   Address of the EEPROM location to read from
+ *
+ *  \return Read byte of EEPROM data.
+ */
+static uint8_t ReadEEPROMByte(const uint8_t* const Address)
+{
+	return eeprom_read_byte(Address);
+}
+
+/** Writes a byte of EEPROM out to the EEPROM memory space.
+ *
+ *  \note This function is required as the avr-libc EEPROM functions do not cope
+ *        with linker relaxations, and a jump longer than 4K of FLASH on the
+ *        larger USB AVRs will break the linker. This function is marked as
+ *        never inlinable and placed into the normal text segment so that the
+ *        call to the EEPROM function will be short even if the AUX boot section
+ *        is used.
+ *
+ *  \param[in]  Address   Address of the EEPROM location to write to
+ *  \param[in]  Data      New data to write to the EEPROM location
+ */
+static void WriteEEPROMByte(uint8_t* const Address,
+                            const uint8_t Data)
+{
+	 eeprom_update_byte(Address, Data);
+}
+
+/** Updates a FAT12 cluster entry in the FAT file table with the specified next
+ *  chain index. If the cluster is the last in the file chain, the magic value
+ *  \c 0xFFF should be used.
+ *
+ *  \note FAT data cluster indexes are offset by 2, so that cluster 2 is the
+ *        first file data cluster on the disk. See the FAT specification.
+ *
+ *  \param[out]  FATTable    Pointer to the FAT12 allocation table
+ *  \param[in]   Index       Index of the cluster entry to update
+ *  \param[in]   ChainEntry  Next cluster index in the file chain
+ */
+static void UpdateFAT12ClusterEntry(uint8_t* const FATTable,
+                                    const uint16_t Index,
+                                    const uint16_t ChainEntry)
+{
+	/* Calculate the starting offset of the cluster entry in the FAT12 table */
+	uint8_t FATOffset   = (Index + (Index >> 1));
+	bool    UpperNibble = ((Index & 1) != 0);
+
+	/* Check if the start of the entry is at an upper nibble of the byte, fill
+	 * out FAT12 entry as required */
+	if (UpperNibble)
+	{
+		FATTable[FATOffset]     = (FATTable[FATOffset] & 0x0F) | ((ChainEntry & 0x0F) << 4);
+		FATTable[FATOffset + 1] = (ChainEntry >> 4);
+	}
+	else
+	{
+		FATTable[FATOffset]     = ChainEntry;
+		FATTable[FATOffset + 1] = (FATTable[FATOffset] & 0xF0) | (ChainEntry >> 8);
+	}
+}
+
+/** Updates a FAT12 cluster chain in the FAT file table with a linear chain of
+ *  the specified length.
+ *
+ *  \note FAT data cluster indexes are offset by 2, so that cluster 2 is the
+ *        first file data cluster on the disk. See the FAT specification.
+ *
+ *  \param[out]  FATTable     Pointer to the FAT12 allocation table
+ *  \param[in]   Index        Index of the start of the cluster chain to update
+ *  \param[in]   ChainLength  Length of the chain to write, in clusters
+ */
+static void UpdateFAT12ClusterChain(uint8_t* const FATTable,
+                                    const uint16_t Index,
+                                    const uint8_t ChainLength)
+{
+	for (uint8_t i = 0; i < ChainLength; i++)
+	{
+		uint16_t CurrentCluster = Index + i;
+		uint16_t NextCluster    = CurrentCluster + 1;
+
+		/* Mark last cluster as end of file */
+		if (i == (ChainLength - 1))
+		  NextCluster = 0xFFF;
+
+		UpdateFAT12ClusterEntry(FATTable, CurrentCluster, NextCluster);
+	}
+}
+
+/** Reads or writes a block of data from/to the physical device FLASH using a
+ *  block buffer stored in RAM, if the requested block is within the virtual
+ *  firmware file's sector ranges in the emulated FAT file system.
+ *
+ *  \param[in]      BlockNumber  Physical disk block to read from/write to
+ *  \param[in,out]  BlockBuffer  Pointer to the start of the block buffer in RAM
+ *  \param[in]      Read         If \c true, the requested block is read, if
+ *                               \c false, the requested block is written
+ */
+static void ReadWriteFLASHFileBlock(const uint16_t BlockNumber,
+                                    uint8_t* BlockBuffer,
+                                    const bool Read)
+{
+	uint16_t FileStartBlock = DISK_BLOCK_DataStartBlock + (*FLASHFileStartCluster - 2) * SECTOR_PER_CLUSTER;
+	uint16_t FileEndBlock   = FileStartBlock + (FILE_SECTORS(FLASH_FILE_SIZE_BYTES) - 1);
+
+	/* Range check the write request - abort if requested block is not within the
+	 * virtual firmware file sector range */
+	if (!((BlockNumber >= FileStartBlock) && (BlockNumber <= FileEndBlock)))
+	  return;
+
+	#if (FLASHEND > 0xFFFF)
+	uint32_t FlashAddress = (uint32_t)(BlockNumber - FileStartBlock) * SECTOR_SIZE_BYTES;
+	#else
+	uint16_t FlashAddress = (uint16_t)(BlockNumber - FileStartBlock) * SECTOR_SIZE_BYTES;
+	#endif
+
+	if (Read)
+	{
+		/* Read out the mapped block of data from the device's FLASH */
+		for (uint16_t i = 0; i < SECTOR_SIZE_BYTES; i++)
+		{
+			#if (FLASHEND > 0xFFFF)
+			  BlockBuffer[i] = pgm_read_byte_far(FlashAddress++);
+			#else
+			  BlockBuffer[i] = pgm_read_byte(FlashAddress++);
+			#endif
+		}
+	}
+	else
+	{
+		/* Write out the mapped block of data to the device's FLASH */
+		for (uint16_t i = 0; i < SECTOR_SIZE_BYTES; i += 2)
+		{
+			if ((FlashAddress % SPM_PAGESIZE) == 0)
+			{
+				/* Erase the given FLASH page, ready to be programmed */
+				BootloaderAPI_ErasePage(FlashAddress);
+			}
+
+			/* Write the next data word to the FLASH page */
+			BootloaderAPI_FillWord(FlashAddress, (BlockBuffer[i + 1] << 8) | BlockBuffer[i]);
+			FlashAddress += 2;
+
+			if ((FlashAddress % SPM_PAGESIZE) == 0)
+			{
+				/* Write the filled FLASH page to memory */
+				BootloaderAPI_WritePage(FlashAddress - SPM_PAGESIZE);
+			}
+		}
+	}
+}
+
+/** Reads or writes a block of data from/to the physical device EEPROM using a
+ *  block buffer stored in RAM, if the requested block is within the virtual
+ *  firmware file's sector ranges in the emulated FAT file system.
+ *
+ *  \param[in]      BlockNumber  Physical disk block to read from/write to
+ *  \param[in,out]  BlockBuffer  Pointer to the start of the block buffer in RAM
+ *  \param[in]      Read         If \c true, the requested block is read, if
+ *                               \c false, the requested block is written
+ */
+static void ReadWriteEEPROMFileBlock(const uint16_t BlockNumber,
+                                     uint8_t* BlockBuffer,
+                                     const bool Read)
+{
+	uint16_t FileStartBlock = DISK_BLOCK_DataStartBlock + (*EEPROMFileStartCluster - 2) * SECTOR_PER_CLUSTER;
+	uint16_t FileEndBlock   = FileStartBlock + (FILE_SECTORS(EEPROM_FILE_SIZE_BYTES) - 1);
+
+	/* Range check the write request - abort if requested block is not within the
+	 * virtual firmware file sector range */
+	if (!((BlockNumber >= FileStartBlock) && (BlockNumber <= FileEndBlock)))
+	  return;
+
+	uint16_t EEPROMAddress = (uint16_t)(BlockNumber - FileStartBlock) * SECTOR_SIZE_BYTES;
+
+	if (Read)
+	{
+		/* Read out the mapped block of data from the device's EEPROM */
+		for (uint16_t i = 0; i < SECTOR_SIZE_BYTES; i++)
+		  BlockBuffer[i] = ReadEEPROMByte((uint8_t*)EEPROMAddress++);
+	}
+	else
+	{
+		/* Write out the mapped block of data to the device's EEPROM */
+		for (uint16_t i = 0; i < SECTOR_SIZE_BYTES; i++)
+		  WriteEEPROMByte((uint8_t*)EEPROMAddress++, BlockBuffer[i]);
+	}
+}
+
+/** Writes a block of data to the virtual FAT filesystem, from the USB Mass
+ *  Storage interface.
+ *
+ *  \param[in]  BlockNumber  Index of the block to write.
+ */
+void VirtualFAT_WriteBlock(const uint16_t BlockNumber)
+{
+	uint8_t BlockBuffer[SECTOR_SIZE_BYTES];
+
+	/* Buffer the entire block to be written from the host */
+	Endpoint_Read_Stream_LE(BlockBuffer, sizeof(BlockBuffer), NULL);
+	Endpoint_ClearOUT();
+
+	switch (BlockNumber)
+	{
+		case DISK_BLOCK_BootBlock:
+		case DISK_BLOCK_FATBlock1:
+		case DISK_BLOCK_FATBlock2:
+			/* Ignore writes to the boot and FAT blocks */
+
+			break;
+
+		case DISK_BLOCK_RootFilesBlock:
+			/* Copy over the updated directory entries */
+			memcpy(FirmwareFileEntries, BlockBuffer, sizeof(FirmwareFileEntries));
+
+			break;
+
+		default:
+			ReadWriteFLASHFileBlock(BlockNumber, BlockBuffer, false);
+			ReadWriteEEPROMFileBlock(BlockNumber, BlockBuffer, false);
+
+			break;
+	}
+}
+
+/** Reads a block of data from the virtual FAT filesystem, and sends it to the
+ *  host via the USB Mass Storage interface.
+ *
+ *  \param[in]  BlockNumber  Index of the block to read.
+ */
+void VirtualFAT_ReadBlock(const uint16_t BlockNumber)
+{
+	uint8_t BlockBuffer[SECTOR_SIZE_BYTES];
+	memset(BlockBuffer, 0x00, sizeof(BlockBuffer));
+
+	switch (BlockNumber)
+	{
+		case DISK_BLOCK_BootBlock:
+			memcpy(BlockBuffer, &BootBlock, sizeof(FATBootBlock_t));
+
+			/* Add the magic signature to the end of the block */
+			BlockBuffer[SECTOR_SIZE_BYTES - 2] = 0x55;
+			BlockBuffer[SECTOR_SIZE_BYTES - 1] = 0xAA;
+
+			break;
+
+		case DISK_BLOCK_FATBlock1:
+		case DISK_BLOCK_FATBlock2:
+			/* Cluster 0: Media type/Reserved */
+			UpdateFAT12ClusterEntry(BlockBuffer, 0, 0xF00 | BootBlock.MediaDescriptor);
+
+			/* Cluster 1: Reserved */
+			UpdateFAT12ClusterEntry(BlockBuffer, 1, 0xFFF);
+
+			/* Cluster 2 onwards: Cluster chain of FLASH.BIN */
+			UpdateFAT12ClusterChain(BlockBuffer, *FLASHFileStartCluster, FILE_CLUSTERS(FLASH_FILE_SIZE_BYTES));
+
+			/* Cluster 2+n onwards: Cluster chain of EEPROM.BIN */
+			UpdateFAT12ClusterChain(BlockBuffer, *EEPROMFileStartCluster, FILE_CLUSTERS(EEPROM_FILE_SIZE_BYTES));
+
+			break;
+
+		case DISK_BLOCK_RootFilesBlock:
+			memcpy(BlockBuffer, FirmwareFileEntries, sizeof(FirmwareFileEntries));
+
+			break;
+
+		default:
+			ReadWriteFLASHFileBlock(BlockNumber, BlockBuffer, true);
+			ReadWriteEEPROMFileBlock(BlockNumber, BlockBuffer, true);
+
+			break;
+	}
+
+	/* Write the entire read block Buffer to the host */
+	Endpoint_Write_Stream_LE(BlockBuffer, sizeof(BlockBuffer), NULL);
+	Endpoint_ClearIN();
+}
diff --git a/lib/lufa/Bootloaders/MassStorage/Lib/VirtualFAT.h b/lib/lufa/Bootloaders/MassStorage/Lib/VirtualFAT.h
new file mode 100644
index 000000000..ea80eae4d
--- /dev/null
+++ b/lib/lufa/Bootloaders/MassStorage/Lib/VirtualFAT.h
@@ -0,0 +1,302 @@
+/*
+             LUFA Library
+     Copyright (C) Dean Camera, 2017.
+
+  dean [at] fourwalledcubicle [dot] com
+           www.lufa-lib.org
+*/
+
+/*
+  Copyright 2017  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+  Permission to use, copy, modify, distribute, and sell this
+  software and its documentation for any purpose is hereby granted
+  without fee, provided that the above copyright notice appear in
+  all copies and that both that the copyright notice and this
+  permission notice and warranty disclaimer appear in supporting
+  documentation, and that the name of the author not be used in
+  advertising or publicity pertaining to distribution of the
+  software without specific, written prior permission.
+
+  The author disclaims all warranties with regard to this
+  software, including all implied warranties of merchantability
+  and fitness.  In no event shall the author be liable for any
+  special, indirect or consequential damages or any damages
+  whatsoever resulting from loss of use, data or profits, whether
+  in an action of contract, negligence or other tortious action,
+  arising out of or in connection with the use or performance of
+  this software.
+*/
+
+#ifndef _VIRTUALFAT_H_
+#define _VIRTUALFAT_H_
+
+	/* Includes: */
+		#include <avr/io.h>
+		#include <avr/pgmspace.h>
+
+		#include <LUFA/Drivers/USB/USB.h>
+
+		#include "../BootloaderAPI.h"
+
+	/* Macros: */
+		/** Size of the virtual FLASH.BIN file in bytes. */
+		#define FLASH_FILE_SIZE_BYTES     (FLASHEND - (FLASHEND - BOOT_START_ADDR) - AUX_BOOT_SECTION_SIZE)
+
+		/** Size of the virtual EEPROM.BIN file in bytes. */
+		#define EEPROM_FILE_SIZE_BYTES    E2END
+
+		/** Number of sectors that comprise a single logical disk cluster. */
+		#define SECTOR_PER_CLUSTER        4
+
+		/** Size of a single logical sector on the disk. */
+		#define SECTOR_SIZE_BYTES         512
+
+		/** Size of a logical cluster on the disk, in bytes */
+		#define CLUSTER_SIZE_BYTES        (SECTOR_PER_CLUSTER * SECTOR_SIZE_BYTES)
+
+		/** Number of sectors required to store a given size in bytes.
+		 *
+		 *  \param[in] size  Size of the data that needs to be stored
+		 *
+		 *  \return Number of sectors required to store the given data on the disk.
+		 */
+		#define FILE_SECTORS(size)        ((size / SECTOR_SIZE_BYTES)  + ((size % SECTOR_SIZE_BYTES)  ? 1 : 0))
+
+		/** Number of clusters required to store a given size in bytes.
+		 *
+		 *  \param[in] size  Size of the data that needs to be stored
+		 *
+		 *  \return Number of clusters required to store the given data on the disk.
+		 */
+		#define FILE_CLUSTERS(size)       ((size / CLUSTER_SIZE_BYTES) + ((size % CLUSTER_SIZE_BYTES) ? 1 : 0))
+
+		/** Total number of logical sectors/blocks on the disk. */
+		#define LUN_MEDIA_BLOCKS          (FILE_SECTORS(FLASH_FILE_SIZE_BYTES) + FILE_SECTORS(EEPROM_FILE_SIZE_BYTES) + 32)
+
+		/** Converts a given time in HH:MM:SS format to a FAT filesystem time.
+		 *
+		 *  \note The minimum seconds resolution of FAT is 2, thus odd seconds
+		 *        will be truncated to the previous integer multiple of 2 seconds.
+		 *
+		 *  \param[in] hh  Hours (0-23)
+		 *  \param[in] mm  Minutes (0-59)
+		 *  \param[in] ss  Seconds (0-59)
+		 *
+		 *  \return Given time encoded as a FAT filesystem timestamp
+		 */
+		#define FAT_TIME(hh, mm, ss)      ((hh << 11) | (mm << 5) | (ss >> 1))
+
+		/** Converts a given date in DD/MM/YYYY format to a FAT filesystem date.
+		 *
+		 *  \param[in] dd    Days in the month (1-31)
+		 *  \param[in] mm    Months in the year (1-12)
+		 *  \param[in] yyyy  Year (1980 - 2107)
+		 *
+		 *  \return Given date encoded as a FAT filesystem datestamp
+		 */
+		#define FAT_DATE(dd, mm, yyyy)    (((yyyy - 1980) << 9) | (mm << 5) | (dd << 0))
+
+		/** Bit-rotates a given 8-bit value once to the right.
+		 *
+		 *  \param[in] x  Value to rotate right once
+		 *
+		 *  \return Bit-rotated input value, rotated once to the right.
+		 */
+		#define ROT8(x)                   ((((x) & 0xFE) >> 1) | (((x) & 1) ? 0x80 : 0x00))
+
+		/** Computes the LFN entry checksum of a MSDOS 8.3 format file entry,
+		 *  to associate a LFN entry with its short file entry.
+		 *
+		 *  \param[in] n0  MSDOS Filename character 1
+		 *  \param[in] n1  MSDOS Filename character 2
+		 *  \param[in] n2  MSDOS Filename character 3
+		 *  \param[in] n3  MSDOS Filename character 4
+		 *  \param[in] n4  MSDOS Filename character 5
+		 *  \param[in] n5  MSDOS Filename character 6
+		 *  \param[in] n6  MSDOS Filename character 7
+		 *  \param[in] n7  MSDOS Filename character 8
+		 *  \param[in] e0  MSDOS Extension character 1
+		 *  \param[in] e1  MSDOS Extension character 2
+		 *  \param[in] e2  MSDOS Extension character 3
+		 *
+		 *  \return LFN checksum of the given MSDOS 8.3 filename.
+		 */
+		#define FAT_CHECKSUM(n0, n1, n2, n3, n4, n5, n6, n7, e0, e1, e2) \
+		   (uint8_t)(ROT8(ROT8(ROT8(ROT8(ROT8(ROT8(ROT8(ROT8(ROT8(ROT8(n0)+n1)+n2)+n3)+n4)+n5)+n6)+n7)+e0)+e1)+e2)
+
+		/** \name FAT Filesystem Flags */
+		//@{
+		/** FAT attribute flag to indicate a read-only file. */
+		#define FAT_FLAG_READONLY         (1 << 0)
+
+		/** FAT attribute flag to indicate a hidden file. */
+		#define FAT_FLAG_HIDDEN           (1 << 1)
+
+		/** FAT attribute flag to indicate a system file. */
+		#define FAT_FLAG_SYSTEM           (1 << 2)
+
+		/** FAT attribute flag to indicate a Volume name entry. */
+		#define FAT_FLAG_VOLUME_NAME      (1 << 3)
+
+		/** FAT attribute flag to indicate a directory entry. */
+		#define FAT_FLAG_DIRECTORY        (1 << 4)
+
+		/** FAT attribute flag to indicate a file ready for archiving. */
+		#define FAT_FLAG_ARCHIVE          (1 << 5)
+
+		/** FAT pseudo-attribute flag to indicate a Long File Name entry. */
+		#define FAT_FLAG_LONG_FILE_NAME   0x0F
+
+		/** Ordinal flag marker for FAT Long File Name entries to mark the last entry. */
+		#define FAT_ORDINAL_LAST_ENTRY    (1 << 6)
+		//@}
+
+	/* Enums: */
+		/** Enum for the Root FAT file entry indexes on the disk. This can be used
+		 *  to retrieve the current contents of a known directory entry.
+		 */
+		enum
+		{
+			/** Volume ID directory entry, giving the name of the virtual disk. */
+			DISK_FILE_ENTRY_VolumeID      = 0,
+			/** Long File Name FAT file entry of the virtual FLASH.BIN image file. */
+			DISK_FILE_ENTRY_FLASH_LFN     = 1,
+			/** Legacy MSDOS FAT file entry of the virtual FLASH.BIN image file. */
+			DISK_FILE_ENTRY_FLASH_MSDOS   = 2,
+			/** Long File Name FAT file entry of the virtual EEPROM.BIN image file. */
+			DISK_FILE_ENTRY_EEPROM_LFN    = 3,
+			/** Legacy MSDOS FAT file entry of the virtual EEPROM.BIN image file. */
+			DISK_FILE_ENTRY_EEPROM_MSDOS  = 4,
+		};
+
+		/** Enum for the physical disk blocks of the virtual disk. */
+		enum
+		{
+			/** Boot sector disk block. */
+			DISK_BLOCK_BootBlock          = 0,
+			/** First copy of the FAT table block. */
+			DISK_BLOCK_FATBlock1          = 1,
+			/** Second copy of the FAT table block. */
+			DISK_BLOCK_FATBlock2          = 2,
+			/** Root file and directory entries block. */
+			DISK_BLOCK_RootFilesBlock     = 3,
+			/** Start block of the disk data section. */
+			DISK_BLOCK_DataStartBlock     = 4,
+		};
+
+	/* Type Definitions: */
+		/** FAT boot block structure definition, used to identify the core
+		 *  parameters of a FAT file system stored on a disk.
+		 *
+		 *  \note This definition is truncated to save space; the magic signature
+		 *        \c 0xAA55 must be appended to the very end of the block for it
+		 *        to be detected by the host as a valid boot block.
+		 */
+		typedef struct
+		{
+			uint8_t  Bootstrap[3];
+			uint8_t  Description[8];
+			uint16_t SectorSize;
+			uint8_t  SectorsPerCluster;
+			uint16_t ReservedSectors;
+			uint8_t  FATCopies;
+			uint16_t RootDirectoryEntries;
+			uint16_t TotalSectors16;
+			uint8_t  MediaDescriptor;
+			uint16_t SectorsPerFAT;
+			uint16_t SectorsPerTrack;
+			uint16_t Heads;
+			uint32_t HiddenSectors;
+			uint32_t TotalSectors32;
+			uint16_t PhysicalDriveNum;
+			uint8_t  ExtendedBootRecordSig;
+			uint32_t VolumeSerialNumber;
+			uint8_t  VolumeLabel[11];
+			uint8_t  FilesystemIdentifier[8];
+			/* uint8_t  BootstrapProgram[448]; */
+			/* uint16_t MagicSignature; */
+		} FATBootBlock_t;
+
+		/** FAT directory entry structure, for the various kinds of File and
+		 *  directory descriptors on a FAT disk.
+		 */
+		typedef union
+		{
+			/** VFAT Long File Name file entry. */
+			struct
+			{
+				uint8_t  Ordinal;
+				uint16_t Unicode1;
+				uint16_t Unicode2;
+				uint16_t Unicode3;
+				uint16_t Unicode4;
+				uint16_t Unicode5;
+				uint8_t  Attribute;
+				uint8_t  Reserved1;
+				uint8_t  Checksum;
+				uint16_t Unicode6;
+				uint16_t Unicode7;
+				uint16_t Unicode8;
+				uint16_t Unicode9;
+				uint16_t Unicode10;
+				uint16_t Unicode11;
+				uint16_t Reserved2;
+				uint16_t Unicode12;
+				uint16_t Unicode13;
+			} VFAT_LongFileName;
+
+			/** Legacy FAT MSDOS 8.3 file entry. */
+			struct
+			{
+				uint8_t  Filename[8];
+				uint8_t  Extension[3];
+				uint8_t  Attributes;
+				uint8_t  Reserved[10];
+				uint16_t CreationTime;
+				uint16_t CreationDate;
+				uint16_t StartingCluster;
+				uint32_t FileSizeBytes;
+			} MSDOS_File;
+
+			/** Legacy FAT MSDOS (sub-)directory entry. */
+			struct
+			{
+				uint8_t  Name[11];
+				uint8_t  Attributes;
+				uint8_t  Reserved[10];
+				uint16_t CreationTime;
+				uint16_t CreationDate;
+				uint16_t StartingCluster;
+				uint32_t Reserved2;
+			} MSDOS_Directory;
+		} FATDirectoryEntry_t;
+
+	/* Function Prototypes: */
+		#if defined(INCLUDE_FROM_VIRTUAL_FAT_C)
+			static uint8_t ReadEEPROMByte(const uint8_t* const Address) ATTR_NO_INLINE;
+
+			static void WriteEEPROMByte(uint8_t* const Address,
+			                            const uint8_t Data) ATTR_NO_INLINE;
+
+			static void UpdateFAT12ClusterEntry(uint8_t* const FATTable,
+			                                    const uint16_t Index,
+			                                    const uint16_t ChainEntry) AUX_BOOT_SECTION;
+
+			static void UpdateFAT12ClusterChain(uint8_t* const FATTable,
+			                                    const uint16_t StartIndex,
+			                                    const uint8_t ChainLength) AUX_BOOT_SECTION;
+
+			static void ReadWriteFLASHFileBlock(const uint16_t BlockNumber,
+			                                    uint8_t* BlockBuffer,
+			                                    const bool Read) AUX_BOOT_SECTION;
+
+			static void ReadWriteEEPROMFileBlock(const uint16_t BlockNumber,
+			                                     uint8_t* BlockBuffer,
+			                                     const bool Read) AUX_BOOT_SECTION;
+		#endif
+
+		void VirtualFAT_WriteBlock(const uint16_t BlockNumber) AUX_BOOT_SECTION;
+		void VirtualFAT_ReadBlock(const uint16_t BlockNumber) AUX_BOOT_SECTION;
+
+#endif