I have an existing and a new application both using mega324, they have plenty of room (when I went from mega16 to 324 the 324 was cheaper than a 164)(and the other is just a LCD driver chip).
One have a real RS232 (max232 no handshake), and the other use USB using a FT232 (a real one :) ).
I use windows and a USB to rs232 on my PC (And don't want to change the default driver setting!)
For both projects I have used this compiler "WinAVR-20100110\bin\avr-gcc.exe".
I would prefer to use the intel hex file direct (but it isn't a must)
I will prefer to use the same bootloader , any sugestions?