AVR Downloader/UploaDEr - Bugs: bug #40061, avrdude -U fails to save final FF...
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bug #40061: avrdude -U fails to save final FF bytes.
Submitter: | Bob Cunningham <bobc> | ||
Submitted: | Wed 18 Sep 2013 05:50:04 PM UTC | ||
Category: | None | Severity: | 3 - Normal |
Priority: | 5 - Normal | Item Group: | None |
Status: | Wont Fix | Privacy: | Public |
Assigned to: | None | Originator Name: | BobC |
Open/Closed: | Closed | Release: | None |
Programmer hardware: | Device type: |
Wed 18 Sep 2013 07:38:09 PM UTC, comment #5: |
Bob Cunningham <bobc> |
Wed 18 Sep 2013 07:29:39 PM UTC, comment #4: No point in yelling, sorry.
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Joerg Wunsch <joerg_wunsch> |
Wed 18 Sep 2013 07:03:36 PM UTC, comment #3: It gets worse: I just checked the saved image, and found it contains almost 20K of FF bytes in the middle (bootloader at one end, app at the other).
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Bob Cunningham <bobc> |
Wed 18 Sep 2013 06:21:46 PM UTC, comment #2: This is a bug, since a verify of the full 32K would fail if the high bytes had been modified.
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Bob Cunningham <bobc> |
Wed 18 Sep 2013 06:12:49 PM UTC, comment #1: This is a feature: as writing NOR flash with 0xFF is a NOP,
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Joerg Wunsch <joerg_wunsch> |
Wed 18 Sep 2013 05:50:04 PM UTC, original submission:
I wanted to preserve the original content of a borrowed ATmega328p Arduino before overwriting it for non-Arduino use. I used both the Atmel Studio utility and avrdude to obtain an image of the flash content.
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Bob Cunningham <bobc> |
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Date | Changed by | Updated Field | Previous Value | => | Replaced by |
---|---|---|---|---|---|
2013-09-18 | joerg_wunsch | Status | None | Wont Fix | |
Open/Closed | Open | Closed |
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Corresponding source code
No thanks, my work here is done.
It is clear that avrdude and its images are useless for verification, since they actively prevent all bytes from being verified.
There are other free tools available that get this simple thing right.
There is no reason to use a broken tool, nor to argue with folks who have defended its decade of brokenness.