Re: [avr-chat] How can I individualise specific CPUs?

[Peter Fuhrmann]

Juergen Harms schrieb:
> I am at present wondering about an alternative, based on 
> re-considering my use of eeprom: continue (evidently) to use eeprom 
> for storing data that must survive boots, but rather than initialising 
> the eeprom contents by download, define a condition which triggers 
> initialisation of the contents of eeprom by program-controlled 
> transfer from flash (for instance, trigger the transfer when at 
> boot-time a specific eeprom byte contains 0xFF). That would allow to 
> always maintain the EESAVE bit programmed and keep my private data in 
> some "reserved corner" of eeprom. My application could probably live 
> with such an approach - still needs some thinking about.
>
> Juergen

What about modifying your upload-script to first download one byte of 
the eeprom, then create a second eeprom.hex file from your master 
eeprom.hex file, in which you change the byte to the value read with the 
"srecord" tool, and then writing it back?

Greetings,
Peter