[avrdude-dev] Problems with avrdude 5.11+

[Bill O'Neill]

So, over to the list...

Hi All,

Here is a quick satatement of the problem.

When using avrdude 5.11 or 5.11.1 under Windows XP to program the flash 
memory on a ATmega328P using either a ponsyser programmer or USBtinyISP 
programmer it fails verification.  Incorrect data is being written to the 
device.

The input and output files are here:
http://users.vianet.ca/omegamic/avrdude_test/

test_input.hex is the file being written to the device.

dump_ponyser.hex is what got written by the ponyser bit-bang programmer.

dump_usbtiny.hex is what got written by the USBtinyISP programmer.

Here are some interesting facts:

1) The problem does not occur with avrdude 5.4  (I only have 5.4, 5.11 and 
5.11.1 at my disposal, so I do not know which version the problem got 
introduced)
2) The problem does not occur with a programmer emulating an STK500 (so this 
maybe protocol related)
3) The problem does not occur on a faster system (I have not yet tested a 
slower system, but will try to if anyone thinks this might help)
4) The ponyser programmer creates far more errors
5) The errors in each case appear at the begining of a record
6) In the vast majority of the cases, the incorrect data written is the 2nd 
last byte or last 2 bytes of the previous record

Anyone have any ideas?
____________________________
Bill O'Neill

Aztec MCU Prototyping
www.aztecmcu.com


----- Original Message ----- 
From: "Joerg Wunsch" <address@hidden>
To: "Bill O'Neill" <address@hidden>
Sent: Friday, May 18, 2012 3:20 AM
Subject: Re: Problems with avrdude 5.11+


> As Bill O'Neill wrote:
>
> > In each case that it fails, it seems to be reading back the byte
> > value that was at 2 locations back.
>
> Btw., that's really strange.  Can you also compare a full readback
> against the intended data?  Perhaps there's a pattern somehow.
>
> (Better write the result to the list though.)
> --
> cheers, J"org               .-.-.   --... ...--   -.. .  DL8DTL
>
> http://www.sax.de/~joerg/                        NIC: JW11-RIPE
> Never trust an operating system you don't have sources for. ;-)