Re: [avr-chat] Problem writing fuse bytes to atmega128 - timeout error

[Graham Davies]

Thomas Richter schrieb:
> With both tools [STK500 command line programmer, v 2.2 Atmel Corp (C) 
> 2004-2005.) and avrdude]
> I have tried to program the Ethernut board over SP Duo.

Ah, OK, my mistake.  I think of the STK500 as the Atmel "Starter Kit" 
development board.  I actually didn't know there is command-line software to 
drive it.  I always use AVR Studio.

> Where is the difference between programming with SP Duo
> and with special JTAG cable?

I think you need to spend a little time with your User Manuals and Data 
Sheets.  In brief, from what I can see by the pictures alone, the SP Duo can 
perform either ISP or JTAG programming.  The Ethernut board seems to have 
ISP and JTAG headers.  If you connect the SP Duo ISP cable to J7 then you'll 
be programming by ISP.  If you connect the SP Duo JTAG cable to J8 then 
you'll be programming by JTAG.  Forget what I said about the special JTAG 
cable, that appears to be for an earlier version of the Ethernut board.

So, connect the SP Duo JTAG cable to J8, read the User Manual to find out 
how to program the chip via JTAG and try to do something like read the chip 
signature.  If this works, then your problem was very likely to be mis-set 
clock fuses as Joerg predicted.  You can now erase the chip or just set the 
fuses back to an internal clock and you'll be all set.

Graham.