Main Page

From Openjtag

www.openjtag.net

This site has just been rebuilt. It may still lack some content of the original site but work is in progress (slowly) at converting the format, trying to bring the information back up to date, and finding the best way to include it in the new site format.

Welcome to the OpenJTAG Wiki

NOTE on editing this site

Due to persistant spamming of this site we have set it so you need to register to edit pages. Since this alone has not stopped the persistant spammers from just creating random accounts then posting we have had to prevent new account creation.

We do not wish to prevent genuine edits and regret having to resort to this , if you would like and account please email openjtag@whipy.demon.co.uk and i will create an account and email you the details

1 overview of JTAG
2 About the OpenJTAG project
3 Main Site Contents
- 3.1 APEX Boot Loader
4 other links

overview of JTAG

JTAG is a port that allows to directly attach and logically manipulate various kinds of silicon.

A typical setup would be: A host computer connecting over Parport, Serial, USB, Ethernet to a JTAG host interfacewhich connects to the JTAG port on the target device.

JTAG is a whole lot more than just programming of devices.

It was designed to be used in test and qualification of systems down to the chip level.

As such it can be used for debugging of Bootloaders, Drivers and other low level operations in embedded systems.

About the OpenJTAG project

This project aims to enable an embedded developer to program, verify and debug a system utilizing the JTAG interface, using open hardware and Free Software.

There are a number of main goals of the project:

1. Emulate functionality of parallel port based "Wiggler" interfaces.

2. Increase programming speed against the parallel port based interfaces.

3. Add additional functionality. e.g. Built in serial ports

4. Add target devices.