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Xilinx Virtual Cable Server for Raspberry Pi

Xilinx Virtual Cable (XVC) is a TCP/IP-based protocol that acts like a JTAG cable and provides a means to access and debug your FPGA or SoC design without using a physical cable.

A full description of Xilinx Virtual Cable in action is provided in the XAPP1252 application note.

Xvcpi implements an XVC server to allow a Xilinx FPGA or SoC to be controlled remotely by Xilinx Vivado using the Xilinx Virtual Cable protocol. Xvcpi uses TCP port 2542.

The xvcpi server runs on a Raspberry Pi which is connected, using JTAG, to the target device. Xvcpi bitbangs the JTAG control signals on the Pi pins. The bitbanging code was originally extracted from OpenOCD's bcm2835gpio.c file.

Authors: Derek Mulcahy (https://github.com/derekmulcahy), https://github.com/strongleg, Carlos (https://github.com/carlosFPGA)

Note: This software was tested on a WiFi-connected Raspberry Pi 4 Model B running Raspberry Pi OS Lite (May-7th-2021) in August-2021. The remote box was running Vivado 2021.1 against the EBAZ4205 FPGA Development Board.

Note 2: This is a portable, tested, maintained clone of https://github.com/strongleg/xvcpi, https://github.com/carlosFPGA/xvcpi/, and https://github.com/derekmulcahy/xvcpi projects.

Tested RPi Boards Raspberry Pi 4 Model B Raspberry Pi 1 Model B+ (tested in August-2021) Wiring

Note: The Raspberry Pi is a 3.3V device. Ensure that the target device and the Pi are electrically compatible before connecting them.

JTAG uses 4 signals, TMS, TDI, TDO and, TCK. From the Raspberry Pi perspective, TMS, TDI and TCK are outputs, and TDO is an input.

Note: The default pin mappings for the Raspberry Pi header are:

TMS = GPIO 4, TDI = GPIO 22, TCK = GPIO 17, TDO = GPIO 27

The pin mappings can be changed by optional flags of xvcpi: -c (for TCK), -m (for TMS), -i (for TDI), -o (for TDO).

Recommended command-line:

sudo ./xvcpi -c 17 -m 4 -i 22 -o 27

Note: These pin mappings match the ./xc3sprog -c matrix_creator ... pin mappings as well.

In addition a ground connection is required - Pin 9 is a conveniently placed GND.

Note: XVC does not provide control of either SRST or TRST and xvcpi does not support a RST signal.

Image Credit: Raspberry Pi Foundation

Build Software sudo apt install pigpio pigpio-tools git build-essential make git clone https://github.com/kholia/xvcpi.git cd xvcpi make Usage

Start xvcpi on the Raspberry Pi. An optional -v flag can be used for verbose output.

sudo ./xvcpi -c 17 -m 4 -i 22 -o 27

Select the Add Xilinx Virtual Cable (XVC) option in the Hardware Manager in Vivado and mention the IP address of the RPi.

More details:

Vivado connects to xvcpi via an intermediate software server called hw_server. To allow Vivado "autodiscovery" of xvcpi via hw_server run:

hw_server -e 'set auto-open-servers xilinx-xvc::2542'

Alternatively, the following tcl commands can be used in the Vivado Tcl console to initiate a connection.

connect_hw_server open_hw_target -xvc_url :2542

Full instructions can be found in ProdDoc_XVC_2014 3.

Alternate Usage

The xc3sprog software supports using RPi as a wired JTAG cable.

sudo apt-get install build-essential libusb-dev libftdi-dev wiringpi git cmake git clone https://github.com/matrix-io/xc3sprog && cd xc3sprog mkdir build && cd build cmake .. make ./xc3sprog -c matrix_creator -j XC3SPROG (c) 2004-2011 xc3sprog project $Rev: 774 $ OS: Linux Free software: If you contribute nothing, expect nothing! Feedback on success/failure/enhancement requests: http://sourceforge.net/mail/?group_id=170565 Check Sourceforge for updates: http://sourceforge.net/projects/xc3sprog/develop JTAG loc.: 0 IDCODE: 0x4ba00477 Desc: ARM_Cortex-M3_r1p1-01rel0 Rev: E IR length: 4 JTAG loc.: 1 IDCODE: 0x13722093 Desc: XC7Z010 Rev: A IR length: 6 ./xc3sprog -c matrix_creator -p 1 ~/top.bit Rough Performance Stats ("Speed")

If cost and ease-of-availability are the driving constraints (at the cost of speed), then this project is 'usable' and can probably suffice. If higher programming speed is a requirement, I recommend using xc3sprog with an FT2232H board.

Other xvcpi forks may offer faster performance, perhaps at the cost of losing some portability across different RPi versions.

Documentation about GPIO

Low Level Programming of the Raspberry Pi in C

BCM2835 ARM Peripherals

GPIO pads control

The comprehensive GPIO Pinout guide for the Raspberry Pi

BCM2835, BCM2836, BCM2837, BCM2837B0, BCM2711 documentation

Tips

If you see the End of startup status: LOW error message in Vivado, check the FPGA power supply's voltage and current ratings.

If cost and ease-of-availability are the driving constraints (at the cost of speed), then this project can suffice. If higher programming speed is a requirement, I recommend using xc3sprog with an FT2232H board.

Related Ideas / Projects https://github.com/kholia/Colorlight-5A-75B https://github.com/kholia/xvc-esp32 https://github.com/kholia/xvc-esp8266 Licensing

Upstream: https://github.com/strongleg/xvcpi and https://github.com/derekmulcahy/xvcpi projects.

This work, "xvcpi.c", is a derivative of "xvcServer.c" (https://github.com/Xilinx/XilinxVirtualCable)

"xvcServer.c" is licensed under CC0 1.0 Universal (http://creativecommons.org/publicdomain/zero/1.0/) by Avnet and is used by Xilinx for XAPP1251.

"xvcServer.c", is a derivative of "xvcd.c" (https://github.com/tmbinc/xvcd) by tmbinc, used under CC0 1.0 Universal (http://creativecommons.org/publicdomain/zero/1.0/).

Portions of "xvcpi.c" are derived from OpenOCD (http://openocd.org)

"xvcpi.c" is licensed under CC0 1.0 Universal (http://creativecommons.org/publicdomain/zero/1.0/) by Derek Mulcahy.

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