Might have to fane extra RAM so the linker gets closure, and then inspect whose taking the memory
IAR perhaps better at dead-code elimination or folding of things.
Determine if you're initializing RAM based structures/variables that could be static constants, and left/held in FLASH.
Watch the scope of things. Avoid large auto/locals within main() as this never exits.
Try to use auto/locals for initialization, or where the memory doesn't need to be static/global for all eternity. The stack may need to be bigger to accommodate this, but again watch call-trees and scope expectations.
