diff options
Diffstat (limited to 'lib/lufa/Bootloaders/MassStorage/BootloaderMassStorage.txt')
| -rw-r--r-- | lib/lufa/Bootloaders/MassStorage/BootloaderMassStorage.txt | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/lib/lufa/Bootloaders/MassStorage/BootloaderMassStorage.txt b/lib/lufa/Bootloaders/MassStorage/BootloaderMassStorage.txt new file mode 100644 index 000000000..0fea9d9fb --- /dev/null +++ b/lib/lufa/Bootloaders/MassStorage/BootloaderMassStorage.txt @@ -0,0 +1,240 @@ +/** \file + * + * This file contains special DoxyGen information for the generation of the main page and other special + * documentation pages. It is not a project source file. + */ + +/** \mainpage Mass Storage Class USB AVR Bootloader + * + * \section Sec_Compat Demo Compatibility: + * + * The following list indicates what microcontrollers are compatible with this demo. + * + * \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 ATMEGA32U2 - <i>See \ref SSec_Aux_Space</i> + * + * \section Sec_Info USB Information: + * + * The following table gives a rundown of the USB utilization of this demo. + * + * <table> + * <tr> + * <td><b>USB Mode:</b></td> + * <td>Device</td> + * </tr> + * <tr> + * <td><b>USB Class:</b></td> + * <td>Mass Storage Device</td> + * </tr> + * <tr> + * <td><b>USB Subclass:</b></td> + * <td>Bulk-Only Transport</td> + * </tr> + * <tr> + * <td><b>Relevant Standards:</b></td> + * <td>USBIF Mass Storage Standard \n + * USB Bulk-Only Transport Standard \n + * SCSI Primary Commands Specification \n + * SCSI Block Commands Specification</td> + * </tr> + * <tr> + * <td><b>Supported USB Speeds:</b></td> + * <td>Full Speed Mode</td> + * </tr> + * </table> + * + * \section Sec_Description Project Description: + * + * This bootloader enumerates to the host as a Mass Storage device, capable of reading and writing a new binary + * firmware image file, to load firmware onto the AVR. + * + * Out of the box this bootloader builds for the AT90USB1287 with an 8KB bootloader section size, and will fit + * into 6KB 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. + * + * \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 + * drivers need to be supplied for correct operation. + * + * \section Sec_HostApp Host Controller Application + * + * This bootloader is compatible with all operating systems that support the FAT12 file system format. To reprogram the + * device, overwrite a file stored on the virtual FAT filesystem with a new binary (BIN format) image. Remember to safely + * remove your device from the host using the host OS's ejection APIs, to ensure all data is correctly flushed to the + * bootloader's virtual filesystem and not cached in the OS's file system driver. + * + * The current device firmware can be read from the device by reading a file from the virtual FAT filesystem. Two files will + * be present: + * - <b>FLASH.BIN</b>, representing the AVR's internal flash memory + * - <b>EEPROM.BIN</b>, representing the AVR's internal EEPROM memory + * + * To convert an existing Intel HEX (.HEX) program file to a binary (.BIN) file suitable for this bootloader, run: + * \code + * avr-objcopy -O binary -R .eeprom -R .fuse -R .lock -R .signature input.hex output.bin + * \endcode + * From a terminal, replacing <tt>input.hex</tt> and <tt>output.bin</tt> with the respective input and output filenames. + * AVR EEPROM data files in Intel HEX format (.EEP) uses a similar technique: + * \code + * avr-objcopy -O binary input.eep output.bin + * \endcode + * + * \warning This bootloader is currently <b>incompatible with the Apple MacOS X OS Finder GUI</b>, due to the + * large amount of meta files this OS attempts to write to the disk along with the new binaries. On + * this platform, firmwares must be copied to the disk via the Terminal application only to prevent + * firmware corruption. + * + * \section Sec_API User Application API + * + * Several user application functions for FLASH and other special memory area manipulations are exposed by the bootloader, + * allowing the user application to call into the bootloader at runtime to read and write FLASH data. + * + * By default, the bootloader API jump table is located 32 bytes from the end of the device's FLASH memory, and follows the + * following layout: + * + * \code + * #define BOOTLOADER_API_TABLE_SIZE 32 + * #define BOOTLOADER_API_TABLE_START ((FLASHEND + 1UL) - BOOTLOADER_API_TABLE_SIZE) + * #define BOOTLOADER_API_CALL(Index) (void*)((BOOTLOADER_API_TABLE_START + (Index * 2)) / 2) + * + * void (*BootloaderAPI_ErasePage)(uint32_t Address) = BOOTLOADER_API_CALL(0); + * void (*BootloaderAPI_WritePage)(uint32_t Address) = BOOTLOADER_API_CALL(1); + * void (*BootloaderAPI_FillWord)(uint32_t Address, uint16_t Word) = BOOTLOADER_API_CALL(2); + * uint8_t (*BootloaderAPI_ReadSignature)(uint16_t Address) = BOOTLOADER_API_CALL(3); + * uint8_t (*BootloaderAPI_ReadFuse)(uint16_t Address) = BOOTLOADER_API_CALL(4); + * uint8_t (*BootloaderAPI_ReadLock)(void) = BOOTLOADER_API_CALL(5); + * void (*BootloaderAPI_WriteLock)(uint8_t LockBits) = BOOTLOADER_API_CALL(6); + * + * #define BOOTLOADER_MAGIC_SIGNATURE_START (BOOTLOADER_API_TABLE_START + (BOOTLOADER_API_TABLE_SIZE - 2)) + * #define BOOTLOADER_MAGIC_SIGNATURE 0xDCFB + * + * #define BOOTLOADER_CLASS_SIGNATURE_START (BOOTLOADER_API_TABLE_START + (BOOTLOADER_API_TABLE_SIZE - 4)) + * #define BOOTLOADER_MASS_STORAGE_SIGNATURE 0xDF30 + * + * #define BOOTLOADER_ADDRESS_START (BOOTLOADER_API_TABLE_START + (BOOTLOADER_API_TABLE_SIZE - 8)) + * #define BOOTLOADER_ADDRESS_LENGTH 4 + * \endcode + * + * From the application the API support of the bootloader can be detected by reading the FLASH memory bytes located at address + * \c BOOTLOADER_MAGIC_SIGNATURE_START and comparing them to the value \c BOOTLOADER_MAGIC_SIGNATURE. The class of bootloader + * can be determined by reading the FLASH memory bytes located at address \c BOOTLOADER_CLASS_SIGNATURE_START and comparing them + * to the value \c BOOTLOADER_MASS_STORAGE_SIGNATURE. The start address of the bootloader can be retrieved by reading the bytes + * of FLASH memory starting from address \c BOOTLOADER_ADDRESS_START. + * + * \subsection SSec_Aux_Space Auxiliary Bootloader Section + * To make the bootloader function on smaller devices (those with a physical bootloader section of smaller than 6KB) a second + * section of memory (called the <i>Auxiliary Bootloader Section</i>) is added before the start of the real bootloader section, + * and is filled with a portion of the bootloader code. This allows smaller devices to run the bootloader, at the cost of an + * additional portion of the device's FLASH (the bootloader section size in KB subtracted from the 6KB total size). A small + * trampoline is inserted at the start of the auxiliary section so that the bootloader will run normally in the case of a blank + * application section. + * + * On devices supporting a 8KB bootloader section size, the AUX section is not created in the final binary. + * + * \subsection SSec_API_MemLayout Device Memory Map + * The following illustration indicates the final memory map of the device when loaded with the bootloader. + * + * \verbatim + * +----------------------------+ 0x0000 + * | | + * | | + * | | + * | | + * | | + * | | + * | | + * | | + * | User Application | + * | | + * | | + * | | + * | | + * | | + * | | + * | | + * | | + * +----------------------------+ FLASHEND - BOOT_SECTION_SIZE - BOOT_AUX_SECTION_SIZE + * | Booloader Start Trampoline | + * | (Not User App. Accessible) | + * +----------------------------+ FLASHEND - BOOT_SECTION_SIZE - BOOT_AUX_SECTION_SIZE + 4 + * | | + * | Auxiliary Bootloader | + * | Space for Smaller Devices | + * | (Not User App. Accessible) | + * | | + * +----------------------------+ FLASHEND - BOOT_SECTION_SIZE + * | | + * | Bootloader Application | + * | (Not User App. Accessible) | + * | | + * +----------------------------+ FLASHEND - 96 + * | API Table Trampolines | + * | (Not User App. Accessible) | + * +----------------------------+ FLASHEND - 32 + * | Bootloader API Table | + * | (User App. Accessible) | + * +----------------------------+ FLASHEND - 8 + * | Bootloader ID Constants | + * | (User App. Accessible) | + * +----------------------------+ FLASHEND + * \endverbatim + * + * \section Sec_KnownIssues Known Issues: + * + * \par In some cases, the application is not fully loaded into the device. + * Write-caching on some operating systems may interfere with the normal + * operation of the bootloader. Write caching should be disabled when using the + * 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. + * + * \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. + * + * <table> + * <tr> + * <th><b>Define Name:</b></th> + * <th><b>Location:</b></th> + * <th><b>Description:</b></th> + * </tr> + * <tr> + * <td>NO_APP_START_ON_EJECT</td> + * <td>AppConfig.h</td> + * <td>Define to disable automatic start of the loaded application when the virtual + * Mass Storage disk is ejected on the host.</td> + * </tr> + * </table> + */ + |