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I have a problem for TUSB6020 in my DM6437EVM borad!

I download the stack (TUSB6020 USB OTG Driver V1.00.01 DSP/BIOS),build and run it in my DM6437evm board.TUSB6020 connected as a “B” device.PC found it as a 2 Meg RAM drive.I tested it, the max read rate is only 8MB/S,and max write rate is 3MB/s.The tusb6020 connect with a 4 tx pin and 4 rx pin, 99 MHZ VLYNQ clock,dsp run in 540MHZ. I noticed  the readme file  in driver stack :

Know Issues:    

  1. DMA is not functional.
  2. Messaging needed for USB OTG Compliance Testing prints to the JTAG interface not the COM port.
  3. Single Step Set Feature for USB HSET Testing needs to be reconfigured. 

DMA is not functional in the driver stack?But i need  the throughput up to 160Mbps.What should I do next? Is there anyone that has had tested the tusb6020 actual throughput in DM6437 board?