5 files changed, 34 insertions, 5 deletions
diff --git a/Bootloaders/DFU/BootloaderDFU.c b/Bootloaders/DFU/BootloaderDFU.c
index 3ce2a6285..233e145ae 100644
--- a/Bootloaders/DFU/BootloaderDFU.c
+++ b/Bootloaders/DFU/BootloaderDFU.c
@@ -92,6 +92,27 @@ static uint16_t StartAddr = 0x0000;
  */
 static uint16_t EndAddr = 0x0000;
 
+/** Magic lock for forced application start. If the HWBE fuse is programmed and BOOTRST is unprogrammed, the bootloader
+ *  will start if the /HWB line of the AVR is held low and the system is reset. However, if the /HWB line is still held
+ *  low when the application attempts to start via a watchdog reset, the bootloader will re-start. If set to the value
+ *  \ref MAGIC_BOOT_KEY the special init function \ref Application_Jump_Check() will force the application to start.
+ */
+uint32_t MagicBootKey ATTR_NO_INIT;
+
+
+/** Special startup routine to check if the bootloader was started via a watchdog reset, and if the magic application
+ *  start key has been loaded into \ref MagicBootKey. If the bootloader started via the watchdog and the key is valid,
+ *  this will force the user application to start via a software jump.
+ */
+void Application_Jump_Check(void)
+{
+	// If the reset source was the bootloader and the key is correct, clear it and jump to the application
+	if ((MCUSR & (1 << WDRF)) && (MagicBootKey == MAGIC_BOOT_KEY))
+	{
+		MagicBootKey = 0;
+		AppStartPtr();
+	}
+}
 
 /** Main program entry point. This routine configures the hardware required by the bootloader, then continuously
  *  runs the bootloader processing routine until instructed to soft-exit, or hard-reset via the watchdog to start
@@ -695,6 +716,9 @@ static void ProcessWriteCommand(void)
 		{
 			if (SentCommand.Data[1] == 0x00)                                   // Start via watchdog
 			{
+				/* Unlock the forced application start mode of the bootloader if it is restarted */
+				MagicBootKey = MAGIC_BOOT_KEY;
+
 				/* Start the watchdog to reset the AVR once the communications are finalized */
 				wdt_enable(WDTO_250MS);
 			}
diff --git a/Bootloaders/DFU/BootloaderDFU.h b/Bootloaders/DFU/BootloaderDFU.h
index a80775348..46b70c0e9 100644
--- a/Bootloaders/DFU/BootloaderDFU.h
+++ b/Bootloaders/DFU/BootloaderDFU.h
@@ -66,6 +66,9 @@
 
 		/** Minor bootloader version number. */
 		#define BOOTLOADER_VERSION_REV   0
+		
+		/** Magic bootloader key to unlock forced application start mode. */
+		#define MAGIC_BOOT_KEY            0xDC42CACA
 
 		/** Complete bootloader version number expressed as a packed byte, constructed from the
 		 *  two individual bootloader version macros.
@@ -206,6 +209,8 @@
 			static void ProcessWriteCommand(void);
 			static void ProcessReadCommand(void);
 		#endif
+		
+		void Application_Jump_Check(void) ATTR_INIT_SECTION(3);
 
 #endif
 
diff --git a/Bootloaders/DFU/BootloaderDFU.txt b/Bootloaders/DFU/BootloaderDFU.txt
index d0811b2aa..2c9eaf1de 100644
--- a/Bootloaders/DFU/BootloaderDFU.txt
+++ b/Bootloaders/DFU/BootloaderDFU.txt
@@ -47,9 +47,9 @@
  *  This bootloader enumerates to the host as a DFU Class device, allowing for DFU-compatible programming
  *  software to load firmware onto the AVR.
  *
- *  Out of the box this bootloader builds for the USB1287, and should fit into 4KB of bootloader space. If
- *  you wish to enlarge this space and/or change the AVR model, you will need to edit the BOOT_START and MCU
- *  values in the accompanying makefile.
+ *  Out of the box this bootloader builds for the AT90USB1287 with an 8KB bootloader section size, and will fit
+ *  into 4KB of bootloader space. If you wish to alter this size and/or change the AVR model, you will need to
+ *  edit the MCU, FLASH_SIZE_KB and BOOT_SECTION_SIZE_KB values in the accompanying makefile.
  *
  *  When the bootloader is running, the board's LED(s) will flash at regular intervals to distinguish the
  *  bootloader from the normal user application.
diff --git a/Bootloaders/DFU/Descriptors.c b/Bootloaders/DFU/Descriptors.c
index d55159060..ff33b6b64 100644
--- a/Bootloaders/DFU/Descriptors.c
+++ b/Bootloaders/DFU/Descriptors.c
@@ -111,7 +111,7 @@ const USB_Descriptor_Configuration_t ConfigurationDescriptor =
 			.DetachTimeout          = 0x0000,
 			.TransferSize           = 0x0C00,
 
-			.DFUSpecification       = VERSION_BCD(01.01)
+			.DFUSpecification       = VERSION_BCD(01.10)
 		}
 };
 
diff --git a/Bootloaders/DFU/makefile b/Bootloaders/DFU/makefile
index 608564ebe..f78ceb270 100644
--- a/Bootloaders/DFU/makefile
+++ b/Bootloaders/DFU/makefile
@@ -95,7 +95,7 @@ F_USB = $(F_CPU)
 # Note that the bootloader size and start address given in AVRStudio is in words and not
 # bytes, and so will need to be doubled to obtain the byte address needed by AVR-GCC.
 FLASH_SIZE_KB        = 128
-BOOT_SECTION_SIZE_KB = 4
+BOOT_SECTION_SIZE_KB = 8
 
 
 # Formulas used to calculate the starting address of the Bootloader section, and the User Application