I'm suspecting your config files are set up wrong.

On Sunday 14 February 2010, Timo Boettcher wrote:
> Info : 155 2398 core.c:1350 jtag_interface_init(): clock speed 6000 kHz

That's fishy.  Atmel chips are pretty consistent about always
running at "slow clock" -- 32 KiHz -- after reset.

Which means the ARM core can't talk to a JTAG clock running
at 6 MHz.

Suggest you start with "jtag_khz 8" and only jack that speed
up to something faster once the PLLs are set up and the chip
is clocked at something faster.  (A "reset-init" event handler
is often the place to do that.)

OR .. If you have an adapter that supports adaptive clocking,
that should be able to work too.  But your log shows that
you've got an FT223C (not an FT2232H) so that's not an option
with your current hardware.

- Dave

p.s. There's more information in the User's Guide about this
     stuff, and how to make your config files behave.
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