I have used your bootloader for ATmega2560-16AU with 16MHz external crystal and it works like a wonder.
In my new project I have a 3V power supply. Therefore, I am planning to use a low frequency external crystal in order to operate the ATmega at a low frequency so that the voltage will be able to go as low as possible.
However, I have a number of issues/questions:
I uploaded the bootloader using an 8MHz external crystal and it went successfully but I am not able to upload a sketch.
Can I run an ATmega2560-16AU with an 8MHz crystal and will it work at 3V, without any risk?
As I do not have an ATmega2560-8AU right now, I am not able to test this. Will your bootloader work with Atmega2560-8AU and an external 8MHz crystal or, before burning bootloader, do I need to make any changes?
Sorry to ask you such a long query, but I have really spent lots of time looking at this and finally today I made a post everywhere.