Has anyone successfully used urjtag to program the xilinx 
Artix-7 XC7A100T-1 FPGA on the Nexys-4 board from Digilent, Inc? 
http://digilentinc.com/Products/Detail.cfm?NavPath=2,400,1184&Prod=NEXYS4

The board contains an FTDI FT2232 chip,  which identifies to lsusb as:

Bus 001 Device 035: ID 0403:6010 Future Technology Devices International, Ltd 
FT2232C Dual USB-UART/FIFO IC

Using "jtag", I can connect with "cable" as follows, but jtag doesn't 
detect the FPGA (nor anything else) on the jtag chain:

jtag> cable FT2232 vid=0x0403 pid=0x6010
Connected to libftdi driver.
jtag> detect
error: no chain: TDO seems to be stuck at 1


I was hoping to use the svf command to play an svf file from the xilinx 
ISE tools into the fpga.
Any hints?

thanks,
Steve



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