Great suggestions, many thanks.
Hardwiring unused I/O pins so far did not come to my mind, the necessary
soldering will be delicate but should be possible (TQFP64 packages).
Creating a bootloader has been on my todo list for a long time, so far I
managed to do without it. But reading your suggestion, I wonder whether
the bootloader idea has not an interesting side-issue which I might exploit:
- reserve a minimum bootloader (512 words), but do not use a bootloader
(keep the BOOTRST fuse unprogrammed),
- store the CPU specific data in the bootloader flash section (playing
with the lock bits to unprotect and later protect the bootloader
again) - probably possible with a JTAG ICE and avrdude,
- but: can a programme running in the application flash section read
data from the bootstrap flash section? (the manual is explicit on
writing, I did not find any info on reading) - I am optimistic, I
interpret the lack of "prohibited" statements as an indication that
data in that section can be read like any address in flash memory.
I will have to do some reading/playing around to see whether and how
this is feasible.
Juergen
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