Build FPGALink and the cksum VHDL example, and use flcli to write data to a Basys2 board, and then read data back from it.

basys2-howto

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Building FPGALink & the cksum example VHDL for Digilent Basys2 on Linux:

# Install prerequisites:
sudo apt-get install build-essential libreadline-dev libusb-1.0-0-dev python-yaml gcc-avr avr-libc dfu-programmer
mkdir $HOME/20150315
cd $HOME/20150315
wget -qO- http://tiny.cc/msbil | tar zxf -

# Fetch and build flcli:
cd makestuff/apps
../scripts/msget.sh makestuff/flcli/20150315
cd flcli
make deps

# Build the AVR firmware
cd ../../libs/libfpgalink/firmware/avr
cd boards
cp minimus.h basys2.h
vi basys2.h  # fix BSP (I think just #define XTAL 8000000)
cd ..
make BSP=basys2
make BSP=basys2 dfu

# Fetch and build the VHDL version of the cksum example:
cd ../../../..
scripts/msget.sh makestuff/hdlmake
cd hdlmake/apps
../bin/hdlmake.py -g makestuff/swled

cd makestuff/swled/templates/epp/boards
cp -rp nexys2-1200 basys2
rm basys2/board-fx2lp.ucf
vi basys2/board.cfg  #
vi basys2/board.ucf  # configure correctly for Basys2's FPGA
vi basys2/board.xst  #
cd ../../../cksum/vhdl
../../../../../bin/hdlmake.py -t ../../templates/epp/vhdl -b basys2 -p fpga

# Power up the FPGA
../../../../../../apps/flcli/lin.x64/rel/flcli -v 1d50:602b:0001 -d C2+

# Program the FPGA:
../../../../../../apps/flcli/lin.x64/rel/flcli -v 1d50:602b:0001 -p J:D0D2D3D4:fpga.xsvf

# Write 64KiB of random data to the board:
dd if=/dev/urandom of=random.dat bs=1024 count=64
../../../../../../apps/flcli/lin.x64/rel/flcli -v 1d50:602b:0001 -a 'w0 "random.dat";r1;r2' -b

# And now read 64KiB (0x10000 bytes) back from the board and save it as "out.dat":
../../../../../../apps/flcli/lin.x64/rel/flcli -v 1d50:602b:0001 -a 'r0 10000 "out.dat"'