Re: [avrdude-dev] problem with dragon & avrdude, bad signature

[Bob Koutsky]

Hi,

great, that was it. "-B 10" and it works like a charm 8)

thank you,
Bob

On 3/3/07, Galen Seitz <address@hidden> wrote:
> Bob Koutsky wrote:
> > Hi,
> >
> > I'm trying to use avrdude 5.3.1 on Linux (Ubuntu Breezy, avrdude is
> > compiled from source), avrdragon in isp mode connected via USB. When I
> > try to program ATMega8, I keep getting this error:
> >
> > $ avrdude -c dragon_isp  -p m8 -P usb -e
> >
> > avrdude: AVR device initialized and ready to accept instructions
> >
> > Reading | ################################################## | 100% 0.16s
> >
> > avrdude: Device signature = 0xff3f00
> > avrdude: Expected signature for ATMEGA8 is 1E 93 07
> >         Double check chip, or use -F to override this check.
> >
> > avrdude done.  Thank you.
> >
> > The value reported as received device signature keeps changing.
> > Usually (maybe always), it is composed of various combinations of
> > bytes 0x00, 0xff, 0x03, 0xc0, 0x3f, suggesting that there's some
> > pattern in how it is generated.
> >
> > I double, maybe even triple checked the wiring and tried two different
> > avrs.
>
> The mega8 defaults to a 1 MHz clock, which means SCLK needs to be
> <= 250 kHz.  I don't have a Dragon board, but it sounds like SCLK
> is too fast.  With the STK500, the SCLK period can be adjusted
> using avrdude.
>
> galen


--
If the world were going to suddenly turn into a movie without warning,
I wish it would have been one of those boring, talky Merchant-Ivory
ones instead.