X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/d999ca8f305c2df18ce1d0ed24e457211bc71371..151a1c5888f8806d7e2aaf6f29cfb6deae8321ae:/Bootloaders/Printer/BootloaderPrinter.txt

diff --git a/Bootloaders/Printer/BootloaderPrinter.txt b/Bootloaders/Printer/BootloaderPrinter.txt
index 9a6ee5033..71e9b2871 100644
--- a/Bootloaders/Printer/BootloaderPrinter.txt
+++ b/Bootloaders/Printer/BootloaderPrinter.txt
@@ -104,12 +104,18 @@
  *  #define BOOTLOADER_MAGIC_SIGNATURE         0xDCFB
  *
  *  #define BOOTLOADER_CLASS_SIGNATURE_START   (BOOTLOADER_API_TABLE_START + (BOOTLOADER_API_TABLE_SIZE - 4))
- *  #define BOOTLOADER_PRINTER_SIGNATURE       0xCDC1
+ *  #define BOOTLOADER_PRINTER_SIGNATURE       0xDF20
  *
  *  #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_PRINTER_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_API_MemLayout Device Memory Map
  *  The following illustration indicates the final memory map of the device when loaded with the bootloader.
  *
@@ -148,11 +154,20 @@
  *  +----------------------------+ FLASHEND
  *  \endverbatim
  *
- *  Bootloaders reporting a device release revision number of 1.00 or greater are bootloader API enabled. 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_CDC_SIGNATURE.
- *  The start address of the bootloader can be retrieved by reading the bytes of FLASH memory starting from address \c BOOTLOADER_ADDRESS_START.
+ *
+ *  \section Sec_KnownIssues Known Issues:
+ *
+ *  \par On Linux machines, new firmware fails to be sent to the device via CUPS.
+ *  Only a limited subset of normal printer functionality is exposed via the
+ *  bootloader, causing CUPS to reject print requests from applications that
+ *  are unable to handle true plain-text printing. For best results, the low
+ *  level \c lpr command should be used to print new firmware to the bootloader.
+ *
+ *  \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
  *