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How to Use Cortex-A9's L2 Cache as RAM

I use Xilinx Zynq xc7z010,it has a Cortex-A9 MPCore,its L2 Cache controller is L2Cpl310,

My Design is small do not  need DDR, i hope run faster

i hope use its L2 Cache(512KB)  as RAM

so i can added 512KB RAM to my chip,

i can write & read data to the 512KB memory

and write & read data to the 512 KB memory(L2 Cache) is very faster.

how can i do this?