changes to butterfly.c include:
. do not exit for unsupported devices but return -1 from the init function
instead; that way the -F option can be used to continue anyway
. honor the -b option as arbitrary bootloaders could be implemented with
any baud rate, not just the fixed 19200 Bd used by the butterfly
. implement functionality to read the fuse and lock bits, and write the
(boot) lock bits, resp.
. fix the signature byte order
The remaining files document the new functionality.
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main_exit: label to ensure the programmer is released correctly.
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thus it was falsely reporting that it failed when it was actually
working correctly. Fixed.
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to have problems sending a control message (returns an "I/O error").
At least try to recover gracefully in the bening case where the user
did not request a particular serial number, so we could continue
anyway without knowing it.
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usb_get_string_simple() as the latter is only found in recent enough
versions of libusb. That way, silently build without USB support
unless a recent version is available.
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available in recent versions of libusb, and the check isn't really
needed anyway (as the check for vendor and product ID will cover that
as well).
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mkII.
The serial transport methods have been moved out into a record of
function pointers for that purpose, defaulting to the actual serial
connection that natively applies to the hosting system. Iff inside
the JTAG ICE mkII handler a port name starting with "usb" has been
detected, the record of function pointers is switched to USB.
Optionally, a serial number might be specified, so only the JTAG ICE
mkII matching the given serial number will be opened. The match is
done right-to-left, so only the least significant bytes of the serial
number need to be given.
In order to make the change as least intrusive to existing drivers as
possible, the entire naming scheme of the serial_foo() function entry
points has been maintained as access macros that encapsulate these
into the respective indirect function calls via serdev->foo().
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Iff enter_progmode failed with RSP_ILLEGAL_JTAG_ID, give the user a
hint that their JTAGEN fuse might be unset.
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Now loading flash works on these devices even for simple parallel ISP
adapters.
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of the packet to occasionally been misinterpreted as a negative
number.
When discarding a packet for being overly long, restart the state
machine instead of attempting to drop a preposterous amount of data.
It is unlikely in that case that preposterous amount of data would
ever arrive, so rather attempt to re-align the reading algorithm
(supposedly resulting in a timeout and retransmit).
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one byte at a time. Also mention the bug tracker interface on
savannah.
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clash with the Win32 API names for baud rates.
Reported by: Eric
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. Implement the new EECRAddress field in the device descriptor that is
required by the 4.x firmware; make an uneducated guess about what
firmware requires what length of device descriptor -- perhaps Atmel
can be convinced to publish an official matrix for that.
. Specify EECR in the config file where required. Obviously, only
locations that differ from the 0x3c default are mentioned in the
XML files, so by now, this only affects the AT90CAN128 for us.
. After clarification with Atmel, EnablePageProgramming should really
default to 1, and only cleared if specified by an XML parameter. So
far, only the XML files for the ATmega256x and ATmega406 do specify
it at all, and they specify a 1, too.
. Drop the entire OCDEN fuse heuristic. If OCDEN is unprogrammed at
startup, issue a warning that single-byte EEPROM updates won't be
possible. Leave it to the user to program the fuse if desired.
That way, we won't run into any issue of prematurely wearing out the
hfuse EEPROM cell. Interestingly enough, this also solved the
problem of the target not restarting from scratch upon sign-off.
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yesterday's changes (i.e. before rev. 1.10 of ser_posix.c), that is,
exit(1) in case of a timeout. Previously, the upper layers didn't see
the timeout at all.
Quite possible that some of these drivers could handle a timeout more
intelligently though. At least for the rather sophisticated STK500v2
protocol, I think it should be possible to retry the request.
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performance.
Note that many consumers still read one byte at a time though.
This patch has once been submitted to me by Bernd Walter
<ticso@cicely.de>, minor tweak by me (mainly to get it running under
Linux, too).
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Walthinsen, as well as JTAG ICE mkII support (by me).
Erik's submission has been cleaned up a little bit, mostly to add his
name and the current year to the copyright of the new file, remove
trailing white space before importing the files, and fix the minor
syntax errors in his avrdude.conf.in additions (missing semicolons).
The JTAG ICE mkII support should be considered alpha to beta quality
at this point. Few things are still to be done, like defering the
hfuse (OCDEN) tweaks until they are really required. Also, for
reasons not yet known, the target MCU doesn't start to run after
signing off from the ICE, it needs a power-cycle first (at least on my
STK500).
Note that for the JTAG ICE, I did change a few things in the internal
API. Notably I made the serial receive timeout configurable by the
backends via an exported variable (done in both the Posix and the
Win32 implementation), and I made the serial_recv() function return a
-1 instead of bailing out with exit(1) upon encountering a receive
timeout (currently only done in the Posix implementation). Both
measures together allow me to receive a datastreem from the ICE at 115
kbps on a somewhat lossy PCI multi-UART card that occasionally drops a
character. The JTAG ICE mkII protocol has enough of safety layers to
allow recovering from these events, but the previous code wasn't
prepared for any kind of recovery. The Win32 change for this still
has to be done, and the traditional drivers need to be converted to
exit(1) upon encountering a timeout (as they're now getting a -1
returned they didn't see before in that case).
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doc are either not available on all systems or are at best
inconvenient to build and install. The doc can still be built, one
just needs to specify --enable-doc at configure time.
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encoding is correct, specifically the address bits don't exactly match
those of the preliminary datasheet that I have, but I don't see how
they could be right. Tested with STK500 and it works there.
Instruction encodings have not been tested due to lack of a parallel
port on my Mac.
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Joerg Wunsch
Brian S. Dean
Eric Weddington