Re: [avr-chat] How to do JTAG only programming

[hubert-b]

Hi Joerg and AVR-Chat-list!

I updated the "flash" section of avrdude.conf and changed "paged = yes" 
just as you stated. I attached the output of

"# avrdude -c dragon_jtag -P usb -p m406 -U flash:r:asdf:r -vvvv"

in a separate file (I hope it wont be copied line-by-line into the 
mailing list but if this happens, please accept my apology as this was 
not my intention). There are a lot of lines in there and I didn't know 
what might be of interest. I also attached the ATmega406-relevant 
snippet of avrdude.conf that has been used to generate that output.

If you want me do anything (e.g. compile a newer version of avrdude with 
some special flags or so), just let me know.

Any help will be appreciated.

Kind regards
HubertB

On 10/27/2011 09:36 AM, Joerg Wunsch wrote:
> Hi Hubert,
>
> sorry for the late response.
>
> > Unfortunately, reading the eeprom as well
> > as the flash isn't working. In both cases, avrdude just hangs with this
> > error message:
>
> Can you run avrdude with -vvvv (four times "-v"), and post the
> relevant snippets?
>
> > Funny thing is: When I comment the "page_size" as well as the
> > "num_pages" parameters from the eeprom section I can successfuly read
> > the eeprom.
>
> So it appears, somehow the paging stuff doesn't work on the ATmega406.
> The EEPROM routines fall back to one-byte-at-a-time then.
>
> > Appyling the same "trick" to the flash section is not
> > working (avrdude then complains about "Floating point exception").
>
> Bytewise read access to the flash might work, but in order to program
> flash memory, we have to get the pagewise stuff working anyway,
> because you can program the flash memory in full pages only.
>
> >       memory "flash"
> >           paged         = no;
>
> Oh, that should be "yes", for sure.

avrdude.conf
Description: Text document

avrdude_vvvv.txt
Description: Text document