X-Git-Url: http://git.linex4red.de/pub/lufa.git/blobdiff_plain/8cfa2e802332957d461dadfca156a847cf8f0cc3..fd39bcf72bb2a49748b8e5b7c17234e5f3f79020:/Bootloaders/MassStorage/BootloaderMassStorage.txt

diff --git a/Bootloaders/MassStorage/BootloaderMassStorage.txt b/Bootloaders/MassStorage/BootloaderMassStorage.txt
index f7b303858..190ff4a3e 100644
--- a/Bootloaders/MassStorage/BootloaderMassStorage.txt
+++ b/Bootloaders/MassStorage/BootloaderMassStorage.txt
@@ -13,7 +13,7 @@
  *  \li Series 7 USB AVRs (AT90USBxxx7)
  *  \li Series 6 USB AVRs (AT90USBxxx6)
  *  \li Series 4 USB AVRs (ATMEGAxxU4) - <i>See \ref SSec_Aux_Space</i>
- *  \li Series 2 USB AVRs (AT90USBxx2, ATMEGAxxU2) - <i>See \ref SSec_Aux_Space</i>
+ *  \li ATMEGA32U2 - <i>See \ref SSec_Aux_Space</i>
  *
  *  \section Sec_Info USB Information:
  *
@@ -57,6 +57,33 @@
  *  When the bootloader is running, the board's LED(s) will flash at regular intervals to distinguish the
  *  bootloader from the normal user application.
  *
+ *  \warning <b>THIS BOOTLOADER IS NOT SECURE.</b> Malicious entities can recover written data, even if the device
+ *           lockbits are set.
+ *
+ *  \section Sec_Running Running the Bootloader
+ *
+ *  On the USB AVR8 devices, setting the \c HWBE device fuse will cause the bootloader to run if the \c HWB pin of
+ *  the AVR is grounded when the device is reset.
+ *
+ *  The are two behaviours of this bootloader, depending on the device's fuses:
+ *
+ *  <b>If the device's BOOTRST fuse is set</b>, the bootloader will run any time the system is reset from
+ *  the external reset pin, unless no valid user application has been loaded. To initiate the bootloader, the
+ *  device's external reset pin should be grounded momentarily.
+ *
+ *  <b>If the device's BOOTRST fuse is not set</b>, the bootloader will run only if initiated via a software
+ *  jump, or if the \c HWB pin was low during the last device reset (if the \c HWBE fuse is set).
+ *
+ *  For board specific exceptions to the above, see below.
+ *
+ *  \subsection SSec_XPLAIN Atmel Xplain Board
+ *  Ground the USB AVR JTAG's \c TCK pin to ground when powering on the board to start the bootloader. This assumes the
+ *  \c HWBE fuse is cleared and the \c BOOTRST fuse is set as the HWBE pin is not user accessible on this board.
+ *
+ *  \subsection SSec_Leonardo Arduino Leonardo Board
+ *  Ground \c IO13 when powering the board to start the bootloader. This assumes the \c HWBE fuse is cleared and the
+ *  \c BOOTRST fuse is set as the HWBE pin is not user accessible on this board.
+ *
  *  \section Sec_Installation Driver Installation
  *
  *  This bootloader uses the Mass Storage drivers inbuilt into all modern operating systems, thus no additional
@@ -179,12 +206,6 @@
  *  Mass Storage bootloader, or the file system synced via an appropriate command
  *  (such as the OS's normal disk ejection command) before disconnecting the device.
  *
- *  \par After loading an application, it is not run automatically on startup.
- *  Some USB AVR boards ship with the BOOTRST fuse set, causing the bootloader
- *  to run automatically when the device is reset. In most cases, the BOOTRST
- *  fuse should be disabled and the HWBE fuse used instead to run the bootloader
- *  when needed.
- *
  *  \section Sec_Options Project Options
  *
  *  The following defines can be found in this demo, which can control the demo behaviour when defined, or changed in value.