L1120 (W) Section address is not assigned to "BBOOTNV"


I have received the above message whilst trying to compile and link some legacy code. I cannot find any reference to the section 'BBOOTNV' in the code (except the map) and documentation that I have downloaded from the Renesas site. I would appreciate some background to this message and possibly a nudge in the right direction in solving this. Many thanks in advance.