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Re: [avr-gcc-list] Fw: Make Your Own JTAGICE box

From: Marek Michalkiewicz
Subject: Re: [avr-gcc-list] Fw: Make Your Own JTAGICE box
Date: Fri, 25 Apr 2003 00:37:10 +0200
User-agent: Mutt/1.4i

On Fri, Apr 25, 2003 at 08:49:39AM +1200, Jason Kyle wrote:
> :)  Snooping the serial comms would show that up pretty quick and also 
> allow an unobscured binary to be extracted, enabling those who don't use 
> windows to program the micro without astudio.

Good example of fair use, I guess :)

> Still think it's way better to write something from scratch, especially 
> given the max 200kHz JTAG clock the official firmware allows.

http://www.case2000.com/ocd.html has some info about these secret
JTAG commands, perhaps that may be helpful...

The serial port speed looks like a bottleneck for JTAG ICE anyway -
a parallel port JTAG interface may be faster (and cheaper, too).

> Ironically, i've been working on a 3DES encrypted STK500 protocol 
> bootloader lately :)

Is it realistic (no large tables) to implement 3DES in the small
AVR bootloader area (max 8K on m128)?


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