[avrdude-dev] [bug #37812] STK500V2 not programming "blank" pages when not erasing flash (-D)

[Joerg Wunsch]

Update of bug #37812 (project avrdude):

                  Status:                    None => Duplicate              
             Assigned to:                    None => joerg_wunsch           
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #1:

Duplicate of bug #30061, which has been closed as "Invalid".

Flash cells can only be programmed to bit value "0".  In order to get
a cell to level "1", it has to be erased rather than programmed.

Consequently, if you bypass the erase step, it is completely normal
that you cannot revert the cells to "1" by just programming over it
again.  A logical consequence of that is that trying to program a bit
to "1" is a no-op, and thus, trying to program an entire flash page to
0xFF can always be omitted, as it is not supposed to change anything
in that page.

The current SVN code has been changed to only ever trying to program
any page that has got data from the input file, so the old STK500v2
optimization can now be left out.  However, the actual failure is
still in your attempt to program something that isn't in erased state.


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