http://dangerousprototypes.com/docs/Bus_Blaster_v2_design_overview

UrJTAG

root@blue:/bluez/FPGA/Altera-x300# jtag 

UrJTAG 0.10 #2007
Copyright (C) 2002, 2003 ETC s.r.o.
Copyright (C) 2007, 2008, 2009 Kolja Waschk and the respective authors

UrJTAG is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
There is absolutely no warranty for UrJTAG.

warning: UrJTAG may damage your hardware!
Type "quit" to exit, "help" for help.

jtag> cable jtagkey vid=0x0403 pid=0x6010 interface=1
Connected to libftdi driver.
jtag> detect
IR length: 8
Chain length: 1
Device Id: 00000110111000011100000010010011 (0x06E1C093)
  Manufacturer: Xilinx (0x093)
  Part(0):      xc2c32a-vq44 (0x6E1C)
  Stepping:     0
  Filename:     /usr/share/urjtag/xilinx/xc2c32a-vq44/xc2c32a-vq44
Segmentation fault
# WTF?

So, compile urjtag with libft2xx http://www.ftdichip.com/Drivers/D2XX.htm

root@blue:~# jtag

UrJTAG 0.10 #2051
Copyright (C) 2002, 2003 ETC s.r.o.
Copyright (C) 2007, 2008, 2009 Kolja Waschk and the respective authors

UrJTAG is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
There is absolutely no warranty for UrJTAG.

warning: UrJTAG may damage your hardware!
Type "quit" to exit, "help" for help.

jtag> cable ft2232 interface=1
Connected to libftd2xx driver.
jtag> detect
IR length: 8
Chain length: 1
Device Id: 00000110111000011100000010010011 (0x06E1C093)
  Manufacturer: Xilinx (0x093)
  Part(0):      xc2c32a-vq44 (0x6E1C)
  Stepping:     0
  Filename:     /usr/local/share/urjtag/xilinx/xc2c32a-vq44/xc2c32a-vq44
jtag> svf /blue-zfs/dangerous-prototypes-open-hardware/Bus_Blaster/buffer_logic/BBv2-JTAGkey-v1.4-VHDL.svf stop progress
detail: Parsing    660/664 ( 99%)detail: 
detail: Scanned device output matched expected TDO values.