add CONTRIBUTORS file and add copyright header to all files.

CONTRIBUTORS

@@ -0,0 +1,23 @@
+LiteX ecosystem would not exist without the collaborative work of contributors! Here is below the
+list of all the LiteDRAM contributors.
+
+In the source code, each file list the main authors/contributors:
+- author(s) that created the initial content.
+- contributor(s) that added essential features/improvements.
+
+If you think you should be in this list and don't find yourself, write to florent@enjoy-digital.fr
+and we'll fix it!
+
+Contributors:
+Copyright (c) 2019 Ambroz Bizjak <abizjak.pro@gmail.com>
+Copyright (c) 2019 Antony Pavlov <antonynpavlov@gmail.com>
+Copyright (c) 2018 bunnie <bunnie@kosagi.com>
+Copyright (c) 2018-2019 David Shah <dave@ds0.me>
+Copyright (c) 2019 Ewout ter Hoeven <E.M.terHoeven@student.tudelft.nl>
+Copyright (c) 2018 Felix Held <felix-github@felixheld.de>
+Copyright (c) 2015-2019 Florent Kermarrec <florent@enjoy-digital.fr>
+Copyright (c) 2019 Gabriel L. Somlo <gsomlo@gmail.com>
+Copyright (c) 2018 John Sully <john@csquare.ca>
+Copyright (c) 2019 Mateusz Holenko <mholenko@antmicro.com>
+Copyright (c) 2015 Sebastien Bourdeauducq <sb@m-labs.hk>
+Copyright (c) 2016-2016 Tim 'mithro' Ansell <me@mith.ro>

examples/arty_config.py

@@ -1,3 +1,6 @@
+# This file is Copyright (c) 2018-2019 Florent Kermarrec <florent@enjoy-digital.fr>
+# License: BSD
+
 from litedram.modules import MT41K128M16
 from litedram.phy import A7DDRPHY
 

examples/genesys2_config.py

@@ -1,3 +1,6 @@
+# This file is Copyright (c) 2018-2019 Florent Kermarrec <florent@enjoy-digital.fr>
+# License: BSD
+
 from litedram.modules import MT41J256M16
 from litedram.phy import K7DDRPHY
 

examples/litedram_gen.py

@@ -1,3 +1,6 @@
+# This file is Copyright (c) 2018-2019 Florent Kermarrec <florent@enjoy-digital.fr>
+# License: BSD
+
 #!/usr/bin/env python3
 import os
 import sys

examples/nexys4ddr_config.py

@@ -1,3 +1,6 @@
+# This file is Copyright (c) 2018-2019 Florent Kermarrec <florent@enjoy-digital.fr>
+# License: BSD
+
 from litedram.modules import MT47H64M16
 from litedram.phy import A7DDRPHY
 

litedram/common.py

@@ -1,3 +1,8 @@
+# This file is Copyright (c) 2016-2019 Florent Kermarrec <florent@enjoy-digital.fr>
+# This file is Copyright (c) 2018 John Sully <john@csquare.ca>
+# This file is Copyright (c) 2018 bunnie <bunnie@kosagi.com>
+# License: BSD
+
 from migen import *
 
 from litex.soc.interconnect import stream

litedram/core/bandwidth.py

@@ -1,3 +1,8 @@
+# This file is Copyright (c) 2015 Sebastien Bourdeauducq <sb@m-labs.hk>
+# This file is Copyright (c) 2016-2019 Florent Kermarrec <florent@enjoy-digital.fr>
+# This file is Copyright (c) 2018 John Sully <john@csquare.ca>
+# License: BSD
+
 """LiteDRAM Bandwidth."""
 
 from migen import *

litedram/core/controller.py

@@ -1,3 +1,6 @@
+# This file is Copyright (c) 2015 Sebastien Bourdeauducq <sb@m-labs.hk>
+# This file is Copyright (c) 2016-2019 Florent Kermarrec <florent@enjoy-digital.fr>
+
 """LiteDRAM Controller."""
 
 from migen import *

litedram/core/crossbar.py

@@ -1,3 +1,8 @@
+# This file is Copyright (c) 2015 Sebastien Bourdeauducq <sb@m-labs.hk>
+# This file is Copyright (c) 2016-2019 Florent Kermarrec <florent@enjoy-digital.fr>
+# This file is Copyright (c) 2018 John Sully <john@csquare.ca>
+# License: BSD
+
 """LiteDRAM Crossbar."""
 
 from functools import reduce

litedram/core/multiplexer.py

@@ -1,3 +1,8 @@
+# This file is Copyright (c) 2015 Sebastien Bourdeauducq <sb@m-labs.hk>
+# This file is Copyright (c) 2016-2019 Florent Kermarrec <florent@enjoy-digital.fr>
+# This file is Copyright (c) 2018 John Sully <john@csquare.ca>
+# License: BSD
+
 """LiteDRAM Multiplexer."""
 
 import math

litedram/core/refresher.py

@@ -1,3 +1,7 @@
+# This file is Copyright (c) 2016-2019 Florent Kermarrec <florent@enjoy-digital.fr>
+# This file is Copyright (c) 2015 Sebastien Bourdeauducq <sb@m-labs.hk>
+# License: BSD
+
 """LiteDRAM Refresher."""
 
 from migen import *

litedram/dfii.py

@@ -1,3 +1,5 @@
+# This file is Copyright (c) 2015 Sebastien Bourdeauducq <sb@m-labs.hk>
+
 from migen import *
 
 from litedram.phy import dfi

litedram/frontend/adaptation.py

@@ -1,3 +1,6 @@
+# This file is Copyright (c) 2016-2018 Florent Kermarrec <florent@enjoy-digital.fr>
+# License: BSD
+
 from migen import *
 
 from litex.soc.interconnect import stream

litedram/frontend/axi.py

@@ -1,3 +1,6 @@
+# This file is Copyright (c) 2018-2019 Florent Kermarrec <florent@enjoy-digital.fr>
+# License: BSD
+
 """
 AXI frontend for LiteDRAM
 

litedram/frontend/bist.py

@@ -1,3 +1,7 @@
+# This file is Copyright (c) 2016-2019 Florent Kermarrec <florent@enjoy-digital.fr>
+# This file is Copyright (c) 2016 Tim 'mithro' Ansell <mithro@mithis.com>
+# License: BSD
+
 """Built In Self Test (BIST) modules for testing LiteDRAM functionality."""
 
 from functools import reduce

litedram/frontend/dma.py

@@ -1,3 +1,9 @@
+# This file is Copyright (c) 2015 Sebastien Bourdeauducq <sb@m-labs.hk>
+# This file is Copyright (c) 2016-2018 Florent Kermarrec <florent@enjoy-digital.fr>
+# This file is Copyright (c) 2018 John Sully <john@csquare.ca>
+# This file is Copyright (c) 2016 Tim 'mithro' Ansell <mithro@mithis.com>
+# License: BSD
+
 """Direct Memory Access (DMA) reader and writer modules."""
 
 from migen import *

litedram/frontend/ecc.py

@@ -1,3 +1,6 @@
+# This file is Copyright (c) 2018-2019 Florent Kermarrec <florent@enjoy-digital.fr>
+# License: BSD
+
 """
 ECC frontend for LiteDRAM
 

litedram/frontend/wishbone.py

@@ -1,3 +1,6 @@
+# This file is Copyright (c) 2016-2018 Florent Kermarrec <florent@enjoy-digital.fr>
+# License: BSD
+
 """Wishbone frontend for LiteDRAM"""
 
 from migen import *

litedram/modules.py

@@ -1,3 +1,16 @@
+# This file is Copyright (c) 2015 Sebastien Bourdeauducq <sb@m-labs.hk>
+# This file is Copyright (c) 2015-2019 Florent Kermarrec <florent@enjoy-digital.fr>
+# This file is Copyright (c) 2018 John Sully <john@csquare.ca>
+# This file is Copyright (c) 2019 Ambroz Bizjak <abizjak.pro@gmail.com>
+# This file is Copyright (c) 2019 Antony Pavlov <antonynpavlov@gmail.com>
+# This file is Copyright (c) 2018 bunnie <bunnie@kosagi.com>
+# This file is Copyright (c) 2018 David Shah <dave@ds0.me>
+# This file is Copyright (c) 2019 Steve Haynal - VSD Engineering
+# This file is Copyright (c) 2018 Tim 'mithro' Ansell <me@mith.ro>
+# This file is Copyright (c) 2018 Daniel Kucera <daniel.kucera@gmail.com>
+# This file is Copyright (c) 2018 Mikołaj Sowiński <mikolaj.sowinski@gmail.com>
+# License: BSD
+
 from math import ceil
 from collections import namedtuple
 

litedram/phy/dfi.py

@@ -1,3 +1,5 @@
+# This file is Copyright (c) 2015 Sebastien Bourdeauducq <sb@m-labs.hk>
+
 from migen import *
 from migen.genlib.record import *
 

litedram/phy/s6ddrphy.py

@@ -1,3 +1,4 @@
+# This file is Copyright (c) 2012 Sebastien Bourdeauducq <sb@m-labs.hk>
 # This file is Copyright (c) 2012-2019 Florent Kermarrec <florent@enjoy-digital.fr>
 # License: BSD
 

litedram/phy/s7ddrphy.py

@@ -1,4 +1,5 @@
 # This file is Copyright (c) 2015-2019 Florent Kermarrec <florent@enjoy-digital.fr>
+# This file is Copyright (c) 2015 Sebastien Bourdeauducq <sb@m-labs.hk>
 # License: BSD
 
 # 1:4, 1:2 frequency-ratio DDR2/DDR3 PHY for Xilinx's Series7

litedram/sdram_init.py

@@ -1,3 +1,11 @@
+# This file is Copyright (c) 2013-2014 Sebastien Bourdeauducq <sb@m-labs.hk>
+# This file is Copyright (c) 2013-2019 Florent Kermarrec <florent@enjoy-digital.fr>
+# This file is Copyright (c) 2017 whitequark <whitequark@whitequark.org>
+# This file is Copyright (c) 2014 Yann Sionneau <ys@m-labs.hk>
+# This file is Copyright (c) 2018 bunnie <bunnie@kosagi.com>
+# This file is Copyright (c) 2019 Gabriel L. Somlo <gsomlo@gmail.com>
+# License: BSD
+
 from migen import log2_int
 
 

test/common.py

@@ -1,3 +1,7 @@
+# This file is Copyright (c) 2016-2019 Florent Kermarrec <florent@enjoy-digital.fr>
+# This file is Copyright (c) 2016 Tim 'mithro' Ansell <mithro@mithis.com>
+# License: BSD
+
 import random
 
 from migen import *

test/test_axi.py

@@ -1,3 +1,6 @@
+# This file is Copyright (c) 2018-2019 Florent Kermarrec <florent@enjoy-digital.fr>
+# License: BSD
+
 import unittest
 import random
 

test/test_bist.py

@@ -1,3 +1,7 @@
+# This file is Copyright (c) 2016-2018 Florent Kermarrec <florent@enjoy-digital.fr>
+# This file is Copyright (c) 2016 Tim 'mithro' Ansell <mithro@mithis.com>
+# License: BSD
+
 import unittest
 import random
 

test/test_downconverter.py

@@ -1,3 +1,6 @@
+# This file is Copyright (c) 2017-2019 Florent Kermarrec <florent@enjoy-digital.fr>
+# License: BSD
+
 import unittest
 
 from migen import *

test/test_ecc.py

@@ -1,3 +1,6 @@
+# This file is Copyright (c) 2018-2019 Florent Kermarrec <florent@enjoy-digital.fr>
+# License: BSD
+
 import unittest
 import random
 

test/test_examples.py

@@ -1,3 +1,6 @@
+# This file is Copyright (c) 2018-2019 Florent Kermarrec <florent@enjoy-digital.fr>
+# License: BSD
+
 import unittest
 import os
 

test/test_upconverter.py

@@ -1,3 +1,6 @@
+# This file is Copyright (c) 2017-2019 Florent Kermarrec <florent@enjoy-digital.fr>
+# License: BSD
+
 import unittest
 
 from migen import *