Access EEPROM with AVRDUDE on Mega/Maxi

[pbro]

My question is, how to write EEPROM….thanks for any help…

I am unable to write EEPROM on the Controllino Mega using AVRDUDE in terminal mode (OS=Ubuntu 20.04, AVRDUDE 6.3-20171130+svn1429-2) with the command line: avrdude -patmega2560 -cwiring -P/dev/ttyACM0 -b115200 -t

After executing the command, AVRDUDE enters terminal mode and allows looking at EEPROM, but not writing, as the following results indicate:

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avrdude: Device signature = 0x1e9801 (probably m2560)

avrdude> dump eeprom 0 16

>>> dump eeprom 0 16

0000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |…………….|

avrdude> write eeprom 0x05 0xA5

>>> write eeprom 0x05 0xA5

avrdude: stk500v2_ReceiveMessage(): timeout

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I am able to program hex files to flash without any problem using AVRDUDE from the command line.