AVR-Chat

--- In AVR-Chat@yahoogroups.com, Dave VanHorn <dvanhorn@d...> wrote:
> At 07:56 AM 12/25/2004, nayoo1979 wrote:
> 
> 
> 
> >Hi all,
> >
> >I am trying to implement an ATMega8 bootloader. If anybody has
> >happened to got the experiences before, pls share with me.
> >
> >I will be very grateful to you, if any of you can kindly share 
with
> >me any of the below:
> >1. where to find the useful information online
> >2. where to find the sample source codes.
> >3. Any Experiences in implementing bootloader
> >4. How to download the Bootloader
> 
> Well, you should chat with the other fellow, you are both trying 
to do the 
> same thing.
> 
> Read the atmel app notes.
> 
> Usually, you implement the boot loader through a USART interface, 
but that 
> isn't required. It's just the most conventional way.  You have it 
try to 
> connect with a PC at boot, and if it can't connect within a 
reasonable time 
> (10 seconds?) then you allow the main program to run.
> 
> Nothing prevents you from doing a loader mechanism inside the main 
program 
> either, but that is a more advanced project, and much 
more "delicate".  The 
> nice thing about the boot block is that you can protect it so that 
the boot 
> loader can't destroy itself accidentally.  So, even if the main 
program is 
> totally erased, the boot loader still works.

Hi,
Thanks for your info:

I am very much interested in your statement of Loader Mechanism? Can 
you elaborate a bit more details?  Which documents should I consult 
to build that Loader Mechanism? Any sample assembly codes etc.

Best Regards,
Nay Oo