tr wrote:
> hi martin thomas,
>
> sorry for using this forum for asking Evertool related questions...

Please just send me an e-mail. My address is at the end of the
Evertool-page. This forum is for the WinARM/arm-elf-gcc/Yagarto users.

> I want to replace in a circuit the ATMega32 with an AtMega644. Currently
> im using your great Evertool, for doing the JTAG debugging on the
> ATMega32.
>
> Can you give me any hints if the Evertool is also able to Debug the
> ATMega644? Maybe it is possible to tell the AVRStudio that im using a
> ATMega32, but in fact im using the ATMega644?

The JTAG-part of the Evertool (like the BootICE and the Olimex AVR-JTAG)
uses the firmware which Atmel provides for their JTAG-ICE "MK1" (which
is not longer sold). So the Evertool supports all devices which Atmel
support with the original device. As far as I know, the ATmega644 is not
supported. You can verify this yourself by reading the AVRStudio
online-help.

> Is this possible - do you or someone else have any expieriences
> concerning this topic?

The firmware source is not available so only Atmel can add support for
additional devices. You can ask them but I don't think they will "waste"
time updating the firmware of a device which has reached "end of life".

> What is the difference between mkII debugging device for the ATMega644
> and the standard Evertool for ATMega32? Has Atmel included some HW-Fuses
> that protects the ATMega644 of not beeing JTAG debugged with the
> Evertool?

Basicly there is no difference. The JTAG-interface (hardware,
state-machine) is standardised. But the protocol used to interface with
the AVR-core is not documented so Atmel can use different commands (the
ATmega644 has a newer core than the ATmega32). I don't think that there
are any special fuses in the ATMega644 or any other non-supported
device. It's just the JTAG-interface's firmware not the target itself.

IRC I have seen an JTAG-ICE MK2 compatible device on e-bay. At least
they state it's compatible in the description. I do not own such a
device. Watch out for special offers from Atmel and the distributors.
Sometimes they offer an inexpensive bundle of AVR STKs together with
JTAG-ICE MK2.

Martin Thomas