You can use Atmel SAM-ICE
http://atmel.com/dyn/products/tools_card.asp?tool_id=3892.
The GESBC-9260S uses a 2x5 header for JTAG signals. You will need to build an adapter cable to connect to the 20pin connector on the SAM-ICE. The JTAG header pin assignment is documented in the GESBC-9260S user's manual.