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

[Graham Davies]

Thomas Richter wrote:
> stk500 says: "Could not enter programming mode"
> avrdude says: "stk500_2_ReceiveMessage(): timeout" (please see my logging 
> in my first email)

Let's take a step back.

Joerg diagnosed your problem as incorrectly set clock selection fuses.  This 
is a common mistake.  We are now going through the standard recovery 
procedures.  The idea is to get back control of the MCU and change the clock 
selection fuse settings so that the clock will start up.

1 - Feed an external clock into the XTAL1 pin ...

You reported that this does not work.

2 - Use JTAG programming, which does not require an MCU clock at all.

We don't think you have understood this suggestion.  We think you are using 
ISP, that is In-System Programming.  Do you have a JTAG programmer?

The STK500 includes programming hardware that can perform ISP and 
high-voltage programming, but not JTAG.  avrdude is software that can drive 
a variety of programmers.  I'm a bit confused that you call them both 
"programmers" and talk about them both giving error messages.  What software 
are you using with the STK500 hardware?  What hardware are you using with 
the avrdude software?

I, too, hope that your MCU is not fried.  Let's hope it's just the fuses and 
that we can wake it up again.

Graham.