How to use Atmega1284AU with Arduino IDE Is there any support to this chip in Arduino IDE, like bootloaders and boards definitions.. i want to use this chip with 3.3V and 8Mhz crystal speed..

I have seen Nick Gammon bootloaders supports this chip for bootloaders, but not with 8Mhz.? and how to add this chip to Arduino IDE.

anybody help..

thanks you
Please check out MightyCore library by MCUdude.

https://github.com/MCUdude/MightyCore

I have used it and can verify it works pretty well with ATmega1284.