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

[Jason Kyle]

At 19:34 24/04/2003 +0200, Marek Michalkiewicz wrote:
> On Thu, Apr 24, 2003 at 09:49:06AM -0700, Sander Pool wrote:
> > Yes, as I thought more about it it seemed unlikely Atmel would provide the
> > binaries for plain ol' ISP download. Someone went through some trouble
> > reverse engineering the bootloader. This is getting closer to being a
> > 'crack' ie. illegal.

No, there ain't any attempt to obscure the code being programmed.  It's 
only between .ebn file and the programming software, kinda funny really 
:)  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.

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


> The bootloader speaks the same good old avr910/pavr protocol that
> avrprog.exe normally uses - only the .ebn file is decrypted first.

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

Cheers,

Jason


> Marek