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Rick Altherr ([email protected]) just uploaded a new patch set to Gerrit, which 
you can find at http://openocd.zylin.com/4375

-- gerrit

commit 7df61e9baf39adf942fba2f53bd93640d1579025
Author: Rick Altherr <[email protected]>
Date:   Mon Jan 22 17:04:41 2018 -0800

    tcl/interface: add Digilent USB-JTAG used on Basys3, Arty, and others
    
    Digilent's product pages for Basys3 and Arty only refer to the on-board
    USB-JTAG adapter as "USB-JTAG."  There is no corresponding product on
    their JTAG Adapter product page
    (https://store.digilentinc.com/all-products/jtag-programmers/).  It
    appears to be similar to HS1 but with a different device description.
    
    Change-Id: Ie39836b095d8ff42489941b858a836b274773739
    Signed-off-by: Rick Altherr <[email protected]>

diff --git a/tcl/interface/ftdi/digilent_usb_jtag.cfg 
b/tcl/interface/ftdi/digilent_usb_jtag.cfg
new file mode 100644
index 0000000..8d7d85f
--- /dev/null
+++ b/tcl/interface/ftdi/digilent_usb_jtag.cfg
@@ -0,0 +1,10 @@
+# Supports on-board Digilent JTAG on Basys3 and Arty.  Appears to be a Digilent
+# HS1 but with a slightly different device description.
+interface ftdi
+ftdi_device_desc "Digilent USB Device"
+ftdi_vid_pid 0x0403 0x6010
+# channel 1 does not have any functionality
+ftdi_channel 0
+# just TCK TDI TDO TMS, no reset
+ftdi_layout_init 0x0088 0x008b
+reset_config none

-- 

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