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README

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commit b157d84434d8589180201606358da5167c1db1b3 1 parent aef2e4b
Sébastien Bourdeauducq authored February 14, 2012

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  1. 79  README
79  README
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+[> Milkymist-NG system-on-chip
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+------------------------------
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+
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+This is the next-generation Milkymist(tm) system-on-chip design,
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+introducing two key innovations:
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+ * Built on the powerful Migen VLSI logic design system.
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+ * Increased system memory performance thanks to a new architecture
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+   (ASMI) containing a transaction-reordering and superscalar controller.
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+
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+The Milkymist-NG SoC supports the Milkymist One board. Obtain yours from:
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+  http://milkymist.org
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+
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+Note that the -NG version is still experimental work in progress. For the
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+production version of Milkymist SoC, visit:
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+  https://github.com/milkymist/milkymist
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+
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+[> Instructions
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+---------------
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+First, download and install Migen from:
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+  https://github.com/milkymist/migen
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+
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+Then, you will need to fetch the "Spartan-6 FPGA DDR/DDR2 SDRAM PHY core"
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+(PHY only solution, we do not need the NWL memory controller) from:
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+  http://www.xilinx.com/products/intellectual-property/1-1MFEDB.htm
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+Downloading it is free of charge, but it cannot be redistributed in
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+source form due to copyright restrictions.
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+
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+Place the Verilog source code of the PHY (contents of
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+phy_rtl/spartan6_soft_phy) into the verilog/s6ddrphy folder.
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+Then run (from verilog/s6ddrphy):
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+  quilt push -a
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+in order to apply patches that make the PHY more compliant with the DFI
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+specification in general, and in particular with the capability to send
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+multiple SDRAM commands in one system clock cycle, which our new SDRAM
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+controller is capable of doing.
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+The patches are against version 1.04 of the PHY.
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+
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+Once this is done, build the bitstream with:
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+  python3 build.py
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+This will generate the build/soc.bit programming file.
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+
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+The SoC expects a bootloader to be located in flash at 0x860000, just
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+like the legacy SoC did. However, there is no binary compatibility and a
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+new BIOS needs to be built and flashed for the -NG SoC.
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+
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+You can find the source code of a compatible BIOS in the software/bios
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+directory. It compiles with Clang and LLVM by default, and you can find
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+the modified version with support for LM32 at:
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+  https://github.com/milkymist/llvm-lm32
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+  https://github.com/milkymist/clang-lm32
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+
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+Enjoy!
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+
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+[> Misc
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+-------
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+Code repository:
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+  https://github.com/milkymist/milkymist-ng
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+
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+Send questions, comments and patches to devel [AT] lists.milkymist.org
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+We are also on IRC: #milkymist on the Freenode network.
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+
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+Milkymist-NG is free software: you can redistribute it and/or modify it
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+under the terms of the GNU General Public License as published by the
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+Free Software Foundation, version 3 of the License. This program is
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+distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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+without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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+PARTICULAR PURPOSE. See the GNU General Public License for more details.
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+
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+The authors grant the additional permissions that the code can be used in
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+conjunction with the LatticeMico32 CPU core from Lattice and the
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+Spartan-6 FPGA DDR/DDR2 SDRAM PHY core from Xilinx and Northwest Logic.
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+
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+Unless otherwise noted, Milkymist-NG's source code is copyright (C)
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+2011-2012 Sebastien Bourdeauducq. Other authors retain ownership of their
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+contributions. If a submission can reasonably be considered independently
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+copyrightable, it's yours and I encourage you to claim it with
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+appropriate copyright notices. This submission then falls under the
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+"otherwise noted" category. All submissions must use a license compatible
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+with the GPL and the additional permissions above.

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