Why i can't insert a CACHE_L2 in my DSP/BIOS configure file.

After creating a "hello world" CCS project for DM642 in the CCS5.5,I Create a DSP/BIOS v5.x Configuration File.

In the MEM, there are only IRAM and SDRAM ,I can‘t find CACHE_L2 in there

After i compile it ,there is no CACHE_L2 in the cmd file or map file.

when i insert the CACHE_L2 ,there is the error message :Object CACHE_L2 already exists!

the figure is as follow.