CCS/TMS320F28335: What does "PartIdRegsFile" do?

Part Number: TMS320F28335

Tool/software: Code Composer Studio

I've encountered the warning when build the project

#10247-D null: creating output section "PartIdRegsFile" without a SECTIONS specification

There's solution on the Internet that simply add the following lines into the CMD file without further explanation:

PARTID      : origin = 0x3D7E80, length = 0x000001     /* Part ID register location */

/*** Device Part ID Register Structures ***/ 
   PartIdRegsFile    : > PARTID,   PAGE = 1

My question is:

1. does the address have to be 0x3D7E80 or other addresses would also work?

2. the program generated without this PARTID seems to work fine. Is this section necessary?

Thanks