Re: [avrdude-dev] CRC check

[E . Weddington]

> On Wed, Oct 08, 2003 at 09:56:21PM -0700, Theodore A. 
Roth wrote:
> 
> > CRC generation of what?
> > What would the CRC be used for?
> 
> The way I read it was that it provides a way for a 
program to do a CRC
> check of its flash and compare that to a previously 
computed value to
> know whether flash had changed (corrupted maybe) or not.
> 
> The idea would be that AVRDUDE would compute the checksum 
and store
> that in a specified eeprom location.  But the more I 
think about it,
> this sound highly application specific and is probably 
better done by
> the application itself.  I.e., when the application comes 
out of
> reset, it can query the eeprom cells that contain the 
checksum or CRC.
> If they are 0xff, it should assume this is a first time 
boot, compute
> its checksum or CRC, then store that in EEPROM.  On 
successive boots,
> it would just do a comparison.  The only assumption 
required is that
> the FLASH is good on the first boot.
> 
> -Brian

This is also based on the assumption that somehow, sometime 
the FLASH gets corrupted. Has anybody ever experienced this?

Besides, I thought that's what the verify step (after 
programming) is for.

Eric