Check the Xilinx website seems to have changed techniques UG-908 now says:
Opening a Hardware Target Using Tcl Commands You can also use Tcl commands to connect to a hardware server/target combination. For instance, to connect to the digilent_plugin target (serial number 210203339395A) that is managed by the hw_server running on localhost 3121, use the following Tcl commands: connect_hw_server -url localhost:3121 current_hw_target [get_hw_targets */xilinx_tcf/Digilent/210203339395A] set_property PARAM.FREQUENCY 15000000 [get_hw_targets */xilinx_tcf/Digilent/210203339395A] open_hw_target
I hope I can program the part in Vivado and just run in Simulink.