Markus_L811:
Did someone get the Optoboot bootloader on an Atmel644P to work in the Arduino IDE?I make an bootloader with the sanguino flag but this is not for the "P" variant of the Core, can someone help me?
As others have said, at least where the boot loader is concerned, Optiboot should run on the 1284P or the 644P, regardless of the number of UARTs. Did you get it to work?