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

[Juergen Harms]

Even if the immediate result does not show an easy solution, this 
discussion (and needing to put in writing what I think) has helped - 
many thanks - and yes, Grahams interpretation describes precisely what I 
want, sorry for the need to be interpreted.

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