__  ___  _   ____     _____
               /  |/  / (_) / __/__  / ___/
              / /|_/ / / / _\ \/ _ \/ /__
             /_/  /_/ /_/ /___/\___/\___/

            Copyright 2007-2015 / M-Labs Ltd
            Copyright 2012-2015 / Enjoy-Digital

    a high performance and small footprint SoC based on Migen

[> Features
-----------
 * LatticeMico32 CPU, modified to include an optional MMU (experimental).
 * mor1kx (a better OpenRISC implementation) as alternative CPU option.
 * High performance memory controller capable of issuing several SDRAM commands
   per FPGA cycle.
 * Supports SDR, DDR, LPDDR, DDR2 and DDR3.
 * Provided peripherals: UART, GPIO, timer, GPIO, NOR flash controller, SPI
   flash controller, Ethernet MAC, and more.
 * High performance:
   - on Spartan-6, 83MHz system clock frequencies, 10+Gbps DDR
   SDRAM bandwidth, 1080p 32bpp framebuffer, etc.
   - on Kintex-7, 125MHz system clock frequencies (up to 200MHz without DDR3),
   64Gbps DDR3 SDRAM bandwidth.
 * Low resource usage: basic implementation fits easily in Spartan-6 LX9.
 * Portable and easy to customize thanks to Python- and Migen-based
   architecture.
 * Design new peripherals using Migen and benefit from automatic CSR maps
   and logic, etc.
 * Possibility to encapsulate legacy Verilog/VHDL code.
 * Complex FPGA cores that can be used integrated in MiSoC or standalone:
     - LiteEth:   a small footprint and configurable Ethernet core

MiSoC comes with built-in support for the following boards:
 * Mixxeo, the digital video mixer from M-Labs [XC6SLX45]
 * Milkymist One, the original M-Labs video synthesizer [XC6SLX45]
 * Papilio Pro, a simple and low-cost development board [XC6SLX9]
 * Pipistrello, a simple board with USB and HDMI [XC6SLX45]
 * De0 Nano, a simple and low-cost development board [CYCLONEIV]
 * KC705, a Kintex-7 devboard from Xilinx [XC7K325T]
 * Versa, a low-cost Lattice development board [ECP3-35]
MiSoC is portable and support for other boards can easily be added as external
modules.

[> Quick start guide
--------------------
0. If cloned from Git without the --recursive option, get the submodules:
  git submodule update --init

1. Install Python 3.3+, Migen and FPGA vendor's development tools.
  Get Migen from: https://github.com/m-labs/migen

2. Install JTAG tools.
  For Mixxeo and M1:          http://urjtag.org
  For Papilio Pro and KC705:  http://xc3sprog.sourceforge.net
  For De0 Nano:               USBBlaster from Altera
  We recommend using xc3sprog for Xilinx devices, but Vivado programmer
  is also supported for Xilinx 7-series.

3. (Optional, only needed if you want to flash the bistream/software)
  Obtain and build any required flash proxy bitstreams. Flash proxy bitstreams
  give JTAG access to a flash chip through the FPGA.
  For Mixxeo and M1: https://github.com/m-labs/fjmem-m1
  For Papilio Pro:   https://github.com/GadgetFactory/Papilio-Loader
    (xc3sprog/trunk/bscan_spi/bscan_spi_lx9_papilio.bit)
  For KC705: https://github.com/m-labs/bscan_spi_kc705

4. Compile and install binutils. Take the latest version from GNU.
  mkdir build && cd build
  ../configure --target=lm32-elf
  make
  make install

5. Compile and install GCC. Take gcc-core and gcc-g++ from GNU
  (version 4.5 or >=4.9).
  rm -rf libstdc++-v3
  mkdir build && cd build
  ../configure --target=lm32-elf --enable-languages="c,c++" --disable-libgcc \
    --disable-libssp
  make
  make install

6. Build and flash the BIOS and bitstream. Run from MiSoC:
  For Mixxeo:      ./make.py all
  For M1:          ./make.py -p m1 all
  For Papilio Pro: ./make.py -t ppro all
  For Pipistrello: ./make.py -t pipistrello all
  For De0 Nano:    ./make.py -t de0nano all load-bitstream
  For KC705:       ./make.py -t kc705 all

  If just want to load the bitstream in volatile SRAM use:
    all load-bitstream

7. Run a terminal program on the board's serial port at 115200 8-N-1.
  You should get the BIOS prompt.

8. Read and experiment with the source!
  Come to our IRC channel and mailing list!
  A simple target is provided to test MiSoC easily with your board:
    Create your target with a clock and serial pins.
    Build and test it: ./make.py -t simple -p your_platform all load-bitstream
  If you don't have access to a FPGA board, you can also try MiSoC
  with Verilator:
    Download and install Verilator: http://www.veripool.org/
    Test it: ./make.py -t simple -p sim build-bitstream

9. Contribute a patch!
  Once you have experimented with stuff, please send your results back.
  For more details on how to do so, you can see the CONTRIBUTING.rst file.

[> License
----------
MiSoC is released under the very permissive two-clause BSD license. Under
the terms of this license, you are authorized to use MiSoC for
closed-source proprietary designs.
Even though we do not require you to do so, those things are awesome, so please
do them if possible:
 * tell us that you are using MiSoC
 * cite MiSoC in publications related to research it has helped
 * send us feedback and suggestions for improvements
 * send us bug reports when something goes wrong
 * send us the modifications and improvements you have done to MiSoC.
   The use of "git format-patch" is recommended. If your submission is large
   and complex and/or you are not sure how to proceed, feel free to discuss it
   on the mailing list or IRC (#m-labs on Freenode) beforehand.

See LICENSE file for full copyright and license info.

[> Links
--------
Web:
  http://m-labs.hk
  http://enjoy-digital.fr

Code repository:
  https://github.com/m-labs/misoc

You can contact us on the public mailing list devel [AT] lists.m-labs.hk.