Bootloader and Boards Definition for Atmega2560V-8AU at 8 MHz / 3.3v I am working on a home made project,where i am using Atmega2560V-8AU (note the suffix, this part has an 8 MHz maximum clock rate) as my main controller, supplying 3.3V to this chip.

I want this controller to work exactly same as standard Atmega2560-16AU like on Arduino Mega(perhaps at a slower baud rate on account of the slower clock)

Does there already exist a suitable bootloader image and board definition for an ATmega2560 operating from an 8 MHz crystal?

If not, what changes would need to be made to the usual 16 MHz bootloader and boards definition to support 8 MHz operation, both for the bootloader and for correct time functions and serial buad rates in sketches?
I have used megacore bootloaders, and it solved the problem