[bug #61169] Bad EEPROM read on mega2560 R3 Arduino board

[anonymous]

URL:
  <https://savannah.nongnu.org/bugs/?61169>

                 Summary: Bad EEPROM read on mega2560 R3 Arduino board
                 Project: AVR Downloader/UploaDEr
            Submitted by: None
            Submitted on: Thu 16 Sep 2021 02:53:37 PM UTC
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: Shane
        Originator Email: santner@gmail.com
             Open/Closed: Open
                 Release: 6.3
         Discussion Lock: Any
     Programmer hardware: wiring/COM
             Device type: 

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Details:

I have a mega2560 R3 arduino board. I created a simple sketch from the Arduino
IDE from file->Examples->EEPROM->eeprom_clear and then modified it to write
0x00112233445566778899aabbccddeeff repeating to the eeprom memory. After
writing out these values and then using avrdude to read them back I get
0x00112233445566770011223344556677 instead. I have a custom programmer that
read back the expected values correctly.

The avrdude command I am using for reading out the eeprom is:
avrdude -p atmega2560 -c wiring -P COM4 -b115200 -U eeprom:r:dump.bin




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