80 lines
3.4 KiB
Plaintext
80 lines
3.4 KiB
Plaintext
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[> Milkymist-NG system-on-chip
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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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The Milkymist-NG SoC supports the Milkymist One board. Obtain yours from:
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http://milkymist.org
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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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[> 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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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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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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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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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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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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Enjoy!
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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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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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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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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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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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