Add Jtag Port
From NAS-Central Buffalo - The Linkstation Wiki
This document is a work in progress. It explains how to fit the internal on-chip debug (OCD) port on a Linkstation, Kuro-Box or Kuro-Box/HG to a PC interface.
Cable required: 
Contents |
OCD connector
The internal OCD port uses an electrical standard known as JTAG/COP. The signals have to be buffered to protect the hardware from damage and we use a JTAG wiggler to do this.
Those with some electrical experience could build their own circuit, but most will opt for ordering one.
Schematics and Software to build your own
http://hri.sourceforge.net/tools/
Buy one
Commercial The Macraigor Wiggler seems to be the cheapest at $150.
Hobby Could the 20-pin Olimex ARM-JTAG be modified to work with Kuro-Box? $20.
Locate the pads
The pads are labelled CN5: 
Connector Pin-outs
In order to use this port, you should add the 10K series VIO resistor R67 and a 4-way 1K resistor pack at RA11. It may be possible to use some functionality without these components.
If you know which set of pin-outs that LinkStation/Kuro-Box uses, please update this page with the details.
According to Baulab the following pins are identified
| TDO | 1 | 2 | ? | |
| TDI | 3 | 4 | ? | |
| ? | 5 | 6 | ? | |
| TCK | 7 | 8 | ? | |
| TMS | 9 | 10 | ? | |
| TMS | 11 | 12 | ? | |
| Vcc | 13 | 14 | ? | |
| ? | 15 | 16 | Gnd |
The same page also contains the schematics, some pictures of the jtag cable and software needed. This cable can be used without adding the additional components.
