Mega R3 boot signature dump

Other Hardware 3rd Party Boards
1

Hi
I bought some arduino mega r3 from aliex.
two of them is no-name variant, one is elegoo.
I dumped boot signature bytes with this code:
https://senzor.robotika.sk/sensorwiki/index.php/Fake_AVR_chips

; noname mega2560 with ch340
boot sig dump

    00  01  02  03  04  05  06  07  08  09  0A  0B  0C  0D  0E  0F
00: 1E  AC  98  FF  01  FF  FF  FF  E7  FF  FF  FF  FF  FF  58  FF  
10: FD  FF  FD  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  

Signature: 1E 98 01  (---)
           Lot: ⸮X⸮⸮⸮⸮  Wafer: 255  X: 255  Y: 255 (Decimal)
    Fuses: Low: 0xFF  High: 0xD8  Ext: 0xFD  Lock: 0xCF

;noname mega2560 with 16u2
boot sig dump

    00  01  02  03  04  05  06  07  08  09  0A  0B  0C  0D  0E  0F
00: 1E  D9  98  FF  01  FF  FF  FF  E7  FF  FF  FF  FF  FF  58  FF  
10: FD  FF  FD  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  

Signature: 1E 98 01  (---)
           Lot: ⸮X⸮⸮⸮⸮  Wafer: 255  X: 255  Y: 255 (Decimal)
    Fuses: Low: 0xFF  High: 0xD8  Ext: 0xFD  Lock: 0xCF

;elegoo mega2560
boot sig dump

    00  01  02  03  04  05  06  07  08  09  0A  0B  0C  0D  0E  0F
00: 1E  C9  98  FF  01  FF  FF  FF  E7  FF  FF  FF  FF  FF  58  FF  
10: FD  FF  FD  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  

Signature: 1E 98 01  (---)
           Lot: ⸮X⸮⸮⸮⸮  Wafer: 255  X: 255  Y: 255 (Decimal)
    Fuses: Low: 0xFF  High: 0xD8  Ext: 0xFD  Lock: 0xFF

If you have a genuine Arduino Mega R3, could you share the boot signature dump?
I want to check if mega2560 does not have manufacturing information on boot signature or my arduino is all fake.

2

Below my output for an original Mega.

14:49:33.503 -> 
14:49:33.503 -> boot sig dump
14:49:33.539 -> 
14:49:33.539 ->     00  01  02  03  04  05  06  07  08  09  0A  0B  0C  0D  0E  0F
14:49:33.539 -> 00: 1E  5A  98  FF  01  FF  FF  FF  ED  FF  FF  F7  FF  FF  6E  75  
14:49:33.539 -> 10: 6E  6B  77  6F  FF  00  04  0D  17  01  12  08  13  08  FF  FF  
14:49:33.539 -> 
14:49:33.539 -> Signature: 1E 98 01  (---)
14:49:33.539 ->            Lot: unknow  Wafer: 0  X: 13  Y: 4 (Decimal)
14:49:33.539 ->     Fuses: Low: 0xFF  High: 0xD8  Ext: 0xFD  Lock: 0xCF
1 Like
4

Anything you buy from AliExpress is extremely likely to use counterfeit, recycled, reject or otherwise untrustworthy chps.

But if the gizmo runs and gives expected results, why do you care?

5

this thing doesn't work as expected.
writing EEPROM over usb serial returns mismatch error.

6

Sounds like a code error, not a hardware error. If you want help fixing that, post the code and the error messages, using code tags.

7

I used avrdude to write eeprom. so it is not code error.
I used below command:
avrdude -c wiring -p m2560 -P COM3 -b 115200 -D -U eeprom:w:"C:\4kbrandom.bin":r
and the result:

avrdude -c wiring -p m2560 -P COM3 -b 115200 -D -U eeprom:w:"C:\4kbrandom.bin":r
Reading 4096 bytes for eeprom from input file 4kbrandom.bin
Writing 4096 bytes to eeprom
Writing | ################################################## | 100% 16.78 s
Reading | ################################################## | 100% 4.19 s
Warning: eeprom verification mismatch
  device 0x0b != input 0x3b at addr 0x0008 (error)
Error: eeprom verification mismatch

Avrdude done.  Thank you.
8

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