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It is also possible to drive JTAG with a firmware core and use the Xilinx XVC protocol to remotely access JTAG. The SLAC surf library provides the necessary components (a firmware block and a software XVC server which must be run on a linux box with connectivity to the firmware). This is a purely networked solution and no hardware JTAG nor USB are required.

Note: when operating over a slow connection then I get better response when I start a Xilinx hw_server on some machine that is close to the xvcSrv (rather than tunneling XVC from the remote machine):

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