This page will try to explain my experience with jtag cable.

Hardware

• JTAG cable

Software

Currently supported jtag utility is UrJTAG

dependencies

apt-get install libreadline-dev

checkout source

svn co https://urjtag.svn.sourceforge.net/svnroot/urjtag/trunk urjtag
cd unrjtag

include

cd include
./autogen.sh
sudo make install
cd ..

jtag

cd jtag
./autogen.sh
make
make install

Connect to device

Load kernel module

modprobe ppdev

Start jtag tool

$ jtag
jtag> cable ppdev /dev/parport0 WIGGLER
Initializing Macraigor Wiggler JTAG Cable on ppdev port /dev/parport0
jtag> detect