问题：iMPACT边界扫描出一个unknown device。 ERROR:iMPACT - Bsdl reader is not available for device 2 .

问题描述： 应用ISE 给FPGA的外界PROMS下载过程中，通过iMPACT边界扫描设备。结果扫描结果是一个FPGA（ xc6slx9）和一个unknown device（说明：硬件资源：FPGA，是 Xilinx的xc6slx9）；PROMs，这里用的是Xilinx的xcf04s)。按理说，这个unknown device就是 xcf04s。但是 iMPACT没有识别出它。

原因：缺少 xcf04s.bsd文件

解决办法：是给这个扫描到的unknown device添加bsdl文件，及就是xcf04s.bsd文件。添加方式是双击unknown device，然后选择xcf04s.bsl添加。然后分别给各个设备添加相应的bit文件和isc文件。之后进行programming，即可将程序下载至proms中，注意：下载的xcf04s.bsl文件通过iMPACT是不能接受.msc文件的，此时一定一定要将.bit文件转化成.isc文件方可被接受。

xcf04s.bsl的下载链接：http://www.bsdl.info/list.htm?search=xcf04S

ISE 的报错报告：

console output:

GUI --- Auto connect to cable...
INFO:iMPACT - Digilent Plugin: Plugin Version: 2.5.2
INFO:iMPACT - Digilent Plugin: no JTAG device was found.
AutoDetecting cable. Please wait.
*** WARNING ***: When port is set to auto detect mode, cable speed is set to default 6 MHz regardless of explicit arguments supplied for setting the baud rates
PROGRESS_START - Starting Operation.
Connecting to cable (Usb Port - USB21).
Checking cable driver.
File version of /opt/Xilinx/14.7/ISE_DS/ISE/bin/lin64/xusbdfwu.hex = 1030.
File version of /usr/share/xusbdfwu.hex = 1030.
Using libusb.
Kernel release = 2.6.32-358.el6.x86_64.
Max current requested during enumeration is 300 mA.
Type = 0x0005.
Cable Type = 3, Revision = 0.
Setting cable speed to 6 MHz.
Cable connection established.
Firmware version = 2401.
File version of /opt/Xilinx/14.7/ISE_DS/ISE/data/xusb_xp2.hex = 2401.
Firmware hex file version = 2401.
PLD file version = 200Dh.
PLD version = 200Dh.
PROGRESS_END - End Operation.
Elapsed time = 2 sec.
Type = 0x0005.
ESN option: 0000150F637001.
Attempting to identify devices in the boundary-scan chain configuration...
INFO:iMPACT - Current time: 1/12/18 7:06 PM
PROGRESS_START - Starting Operation.
Identifying chain contents...INFO:iMPACT:1588 - '0':The part does not appear to be Xilinx Part.
'0': : Manufacturer's ID =Unknown , Version : 13
INFO:iMPACT:501 - '1': Added Device UNKNOWN successfully.
----------------------------------------------------------------------
----------------------------------------------------------------------
'1': : Manufacturer's ID = Xilinx xc6slx9, Version : 2
INFO:iMPACT:1777 -
Reading /opt/Xilinx/14.7/ISE_DS/ISE/spartan6/data/xc6slx9.bsd...
INFO:iMPACT:501 - '1': Added Device xc6slx9 successfully.
----------------------------------------------------------------------
----------------------------------------------------------------------
done.
ERROR:iMPACT - Bsdl reader is not available for device 2.
PROGRESS_END - End Operation.
Elapsed time = 0 sec.
INFO:iMPACT:1777 -
Reading /home/ise/Test/unknown_1_8.bsd...
INFO:iMPACT:1777 -
Reading /home/ise/Test/unknown_1_8.bsd...
INFO:iMPACT - The UNKNOWN device BSDL file(s) are saved to this location: '/home/ise/Test/'