[mc1322x] Integrating JTAG in the next design

[Jon Smirl]

On Thu, Oct 22, 2009 at 4:32 AM, Mariano Alvira <mar at devl.org> wrote:
> 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.

The OpenOCD ft2232 driver complaints are all centered around the GPL
and the closed source FTDI driver on windows. It's not really a
technical argument.

>
> -Mar.
>



-- 
Jon Smirl
jonsmirl at gmail.com