why my usb cable can established,but can't download??? xilinx

hi, all: i install ise9.1 in my gentoo linux. i connect usb cable and run the impact. it displayer the error information : Connecting to cable (Usb Port - USB21). Checking cable driver. File version of /usr/local/xilinx/Xilinx91i/bin/lin/xusbdfwu.hex =

1027(dec), 0403. File version of /usr/share/xusbdfwu.hex = 1030(dec), 0406. WinDriver v9.01 Jungo (c) 1997 - 2007 Build Date: Jun 14 2007 X86 32bit 20:55:18. Cable PID = 0008. Max current requested during enumeration is 150 mA. Cable Type = 3, Revision = 0. write cmdbuffer failed 2000001B. Setting cable speed to 6 MHz. write cmdbuffer failed 2000001B. Cable connection established. Firmware version = 1030. CPLD file version = 0012h. CPLD version = 0012h. PROGRESS_END - End Operation. Elapsed time = 4 sec. Attempting to identify devices in the boundary-scan chain configuration...// *** BATCH CMD : Identify write cmdbuffer failed 2000001B. // *** BATCH CMD : identifyMPM write cmdbuffer failed 2000001B.

why it was connect but cant write cmdbuffer??

anyone ideas?

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luu
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