RE: MC with reflashed signature

[anifontov11]

Hi!

The chip  surely was reprogrammed (it contains some marking over the original). I’ve tried to read/write other chips with my programmer (STK200 h/w + AVRDUDE) and everything was OK. So:

 

• I’m sure that my connections are OK
• Tested board have an XTALL
• I’m sure that signature IS NOT read only 😊

 

If there are some ideas please reply.

 

Alex

 

From: Martin Stejskal <martin.stej@gmail.com>
Sent: Wednesday, June 2, 2021 11:25 AM
To: anifontov11@gmail.com
Cc: avr-chat@nongnu.org
Subject: Re: MC with reflashed signature

 

Hi, the signature bytes are in read only memory. If programmer read them incorrectly, there is HW related issue.

 

Double check wires and connectors. They should be tight connection (loose cables/connectors = problems).

 

Also you might changed oscillator settings, so actually your target device does not have proper clock source. If so, you can use any signal generator and inject external clock (around 1 MHz or more) to XTAL1 pin. That usually works.

 

Regards

  Martin

 

On Tue, Jun 1, 2021, 17:37 <anifontov11@gmail.com> wrote:

Hello, folks! Need some help!

 

Is it possible by the means of AVERDUDE to read the complete image of the MC (FLASH, EPROM, fuses, signatures, etc.) into one file that could be flashed into a new chip? (including signature bytes) The main problem is that signature bytes of the original chip were changed and it is necessary to use -F option.

Does AVERDUDE know how to alter signature bytes? If not, how to do it?

 

So far I have unsatisfactory result:

program enable instruction not defined for part "ATxmega32D4"

avrdude.exe: AVR device not responding

avrdude.exe: initialization failed, rc = -1

avrdude.exe: AVR device initialized and ready to accept instructions

avrdude.exe: Device signature = 0x987ba0

avrdude.exe: Expected signature for ATxmega32D4 is 1E 95 42

avrdude.exe done. Thank you.

 

So the program understands that there was a command to ignore the signature mismatch, but still does not go further.

It would be nice to have the correct command syntax (including where to insert "-F") from the experts..

 

Thanks, Alex