[mc1322x] Integrating JTAG in the next design

[Mariano Alvira]

On Wed, Oct 21, 2009 at 08:43:02PM -0400, Jon Smirl wrote:
> Next time around you might want to put the pads for the JTAG on the
> bottom of the CPU board. Then you could optionally solder on a
> connector which would plug into the baseboard. Make a new baseboard
> with a ft2232 instead of the ft232 and you have integrated JTAG. This
> will raise the price of the baseboard about $4 without changing the
> cost of the module.

Putting the connector on the top made the routing much easier and the
overall board size smaller which, for me, is important. 

I do like your plan of a new baseboard based on the ft2232 --- we
could have a second version of the module which is a little bigger
with the bottom connector. The 2232 board could work with either
module. 

> It will make it a better device for educational use where the students
> don't have JTAGs. Once you have a JTAG you can use Eclipse to program
> the board and debug it.

Yeah, JTAG is a whole other thing that needs work with this
project. The OpenOCD guys seem to complain a lot about the ft2232
driver situation. And it has only been recently that OOCD started to
work well enough with a Jlink and the mc1322x/thumb that real progress
can be made. On the plus side they recently moved to git... so that's
cool.

-Mar.