user34459: 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?

user34459: I have used megacore bootloaders, and it solved the problem

34459: <p>I am working on a home made project,where i am using Atmega2560V-8AU <strong>(note the suffix, this part has an 8 MHz maximum clock rate)</strong> as my main controller, supplying 3.3V to this chip.</p>

<p>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)</p>

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

<p>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?</p>
 34459: <p>I have used megacore bootloaders, and it solved the problem</p>
