JTAG Enable
CONFIG_DSU_JTAG
  Say Y to enable the JTAG debug link (JTAG-to-AHB). Debugging is done 
  with GRMON through the boards JTAG chain at speeds of up to 800 kbits/s. 
  Supported JTAG cables are Xilinx Parallel Cable III and IV, 
  Xilinx Platform cables (USB), and Altera parallel and USB cables.

