用chipscope往xilinx板子里下载程序出现下面问题，怎么办啊
INFO:ChipScopeProAnalyzerVersion:12.4M.81d(Build12400.10.336.1163)COMMAND:open_cableC...
INFO: ChipScope Pro Analyzer Version: 12.4 M.81d (Build 12400.10.336.1163)
COMMAND: open_cable
COMMAND: open_cable
INFO: Started ChipScope host (localhost:50001)
INFO: Successfully opened connection to server: localhost:50001 (localhost/127.0.0.1)
INFO: Trying to open Xilinx Platform USB Cable on port USB2
INFO: No supported devices found in JTAG chain
INFO: Successfully opened Xilinx Platform USB Cable
INFO: Cable: Platform Cable USB, Port: USB21, Speed: 3 MHz
INFO: Attempting to connect to an existing server.
INFO: Successfully opened connection to server: localhost:50001 (localhost/127.0.0.1)
INFO: Trying to open Xilinx Platform USB Cable on port USB2
INFO: No supported devices found in JTAG chain
INFO: Successfully opened Xilinx Platform USB Cable
INFO: Cable: Platform Cable USB, Port: USB21, Speed: 3 MHz
WARNING: Closing cable due to unknown JTAG Chain Device IR length. 展开
COMMAND: open_cable
COMMAND: open_cable
INFO: Started ChipScope host (localhost:50001)
INFO: Successfully opened connection to server: localhost:50001 (localhost/127.0.0.1)
INFO: Trying to open Xilinx Platform USB Cable on port USB2
INFO: No supported devices found in JTAG chain
INFO: Successfully opened Xilinx Platform USB Cable
INFO: Cable: Platform Cable USB, Port: USB21, Speed: 3 MHz
INFO: Attempting to connect to an existing server.
INFO: Successfully opened connection to server: localhost:50001 (localhost/127.0.0.1)
INFO: Trying to open Xilinx Platform USB Cable on port USB2
INFO: No supported devices found in JTAG chain
INFO: Successfully opened Xilinx Platform USB Cable
INFO: Cable: Platform Cable USB, Port: USB21, Speed: 3 MHz
WARNING: Closing cable due to unknown JTAG Chain Device IR length. 展开
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