RIOT-OS/RIOT — pull request #1981 by hexluthor (2014-11-10 19:23:32+00:00)
Title: boards/cc2538dk: allow the application's makefile to override UPDATE_CCA

For example: CFLAGS += -DUPDATE_CCA=0

This produces a much smaller bin file and avoids overwriting the entire flash memory in case parts of it are used for data storage. Plus it's more of an application-specific parameter for the CC2538 than a board-specific parameter.