Clock Mhz again...

I've had a bit of a search on the forum but I'm still not sure of all the changes needed when changing clock speeds.

For the bootloader I think I have to change DBAUD_RATE=57600 AVR_FREQ = 16000000L

and create an entry in boards.txt with these changes .build.mcu=atmega328p .build.f_cpu=16000000L .upload.speed=57600

Are there any other changes needed to be made, and/or what changes will I have to make to a sketch e.g. wirelib purhaps?

thanks.

I seem to remember only changing two files, the Makefile and boards.txt

thanks