In this post, it was mentioned that to get the Arduino IDE to support an ATmega328 (only the ATmega328P is supported):

I should mention the Arduino way of doing this, is to create a new boards.txt file with this chip and add (not change) the avrdude.conf file. This will allow programing either from selecting the correct board. but that is another subject.

After a great deal of research in the past, and attempted modifications to boards.txt and avrdude.conf, I arrived at the conclusion that the Toolchain doesn't support the ATmega328 therefore the changes will have no effect.

Can anyone confirm that they have successfully found a way to make these changes, so we can avoid the need for a work-around?