verification error; content mismatch

Gives this error when uploading codes using arduino IDE with USBASP, and when PORTE is used in the code, the code will not upload at all. but It uploads fine using the hex file generated in arduino IDE directly via avrdude.

avrdude: verifying ... avrdude: verification error, first mismatch at byte 0x0100 0xff != 0x20 avrdude: verification error; content mismatch

bad.txt
good.txt

[MCUdude]

are you using the latest version of MegaCore? Both codes uploads fine on my ATmega128 running at 16MHz using a USB to serial converter. Have you tried using another programmer like Arduino as ISP?

EDIT: I can reproduce the error when using an Arduino sketch. When using int main(void) it works just fine. I'll have a look at it

[MCUdude]

I found the Issue! The good news is that there's nothing wrong with my core. The bad new is that there's nothing I can do about it..

You see, there is some kind of bug in AVRdude 6.0.1 (which Arduino IDE ships with) that gives this error. Running this code:

void setup() {
  DDRA = 0xff;
  DDRB = 0xff;
  DDRC = 0xff;
  DDRD = 0xff;
  DDRE = 0xff;
  DDRF = 0xff;
}

void loop() {
  PORTA ^= 0xff;
  PORTB ^= 0xff;
  PORTC ^= 0xff;
  PORTD ^= 0xff;
  PORTE ^= 0xff;
  PORTF ^= 0xff;

  delay(1000);
}

and uploading with AVRdude 6.0.1 using this command (generated by Arduino IDE):

/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avrdude -C/Users/Hans/Documents/Arduino/hardware/MegaCore/avr/avrdude.conf -v -patmega128 -cusbasp -Pusb -Uflash:w:/var/folders/_p/s3kykxss20bbhfmqcg0ctrp80000gn/T/build6448819071412050804.tmp/sketch_jun18a.cpp.hex:i 

gives this error:

Reading | ################################################## | 100% 0.28s

avrdude: verifying ...
avrdude: verification error, first mismatch at byte 0x0100
         0xff != 0x0f
avrdude: verification error; content mismatch

avrdude done.  Thank you.

If I open Terminal (I'm using a mac by the way) and use the latest version of AVRdud, but still sticks with the same hex file and parameters:

avrdude -C/Users/Hans/Documents/Arduino/hardware/MegaCore/avr/avrdude.conf -v -patmega128 -cusbasp -Pusb -Uflash:w:/var/folders/_p/s3kykxss20bbhfmqcg0ctrp80000gn/T/build6448819071412050804.tmp/sketch_jun18a.cpp.hex:i 

This is the output:

Reading | ################################################## | 100% 0.21s

avrdude: verifying ...
avrdude: 720 bytes of flash verified

avrdude: safemode: hfuse reads as CE
avrdude: safemode: efuse reads as FF
avrdude: safemode: Fuses OK (E:FF, H:CE, L:BF)

avrdude done.  Thank you.

If you won't use the bootloader I guess you'll have to use a newer version of AVRdude. You should probably create an issue over at the Arduino Github page where you suggest bumping up to AVRdude 6.3.

EDIT: It seems like someone already have thought about it!

okay, I see. thank you. Seems to me that this bug only happens when I use 0xff, the default value for all the memory.