Right now I am experimenting with the Nexus debug in the openmsp430 core -- in this implementation the Debugger connects to GDB via Serial/I2C -- I am at the point where I am building a little debug stick from an ICEStick from Lattice to support this effort -- The openmsp430 is presently in a Spartan 6 LX-16 --
JTAG is old, slow, and intrusive. It isn't the only way to debug embedded processors. Nexus 5001 (http://www.nexus5001.org/) defines several levels of debug support, including JTAG. For one implementation, see http://www.ip-extreme.com/IP/nexus_5001.shtml.
As we unveil EE Times’ 2015 Silicon 60 list, journalist & Silicon 60 researcher Peter Clarke hosts a conversation on startups in the electronics industry. Panelists Dan Armbrust (investment firm Silicon Catalyst), Andrew Kau (venture capital firm Walden International), and Stan Boland (successful serial entrepreneur, former CEO of Neul, Icera) join in the live debate.