I have the following problem. I want program the AT91SAMX512 directly by 
JTAG and ICEBreaker.
I have activated the Scan Chain 2 (ICEBreaker) and can read and write 
the ICEBreaker-registers. For example, I write two different values in 
Watchpoint_0_und_1_Address_Registers (0x08 and 0x10) and can this
values read correctly.
But, if I write any command in to 'Debug Comms Data'-register (0x05), 
the 'Debug Comms Control'-register(0x04) got for ever the value 
0x100000001, so that it appears for me, that the
ICEBreaker is not active and the command is not fetched.
Is there what I should some more activate?