In order to allow bigger user program size, is it possible and advisable to reload Pro Mini with the boot loader originally designed for UNO. This will save 1.5 KB flash space (UNO boot loader is 0.5KB, Pro Mini is 2KB).
Using a smaller boot loader is an 'intermediate' step to get more space while still enjoy the easy benefit of the Arduino IDE and many library/code example. Of course, ultimate step is to remove all boot loader (only small saving of 0.5KB if above is possible) and switch to ATmel development environment, ATmel studio, which is complex but programmer has full control of everything.
Did I miss anything in the followings?
I tend to believe that it is possible as
a) same ATMega328 chip is used in both board
b) Pro Mini is essentially cutting UNO into two halves, the MCU and the USB/Serial converter now use external USB to Serial converter
If the Pro Mini board is reloaded with UNO boot loader, how should the boards.txt file be edited to reflect the changes so that the IDE will handle it correctly?
Many thanks in advance