README: clarify license
[litex.git] / README
1 Migen (Milkymist Generator)
2 a Python toolbox for building complex digital hardware
3
4 Migen aims at automating further the VLSI design process. It provides
5 tools to build synchronous designs more productively, integrate
6 system-on-chips, design dataflow systems, and more. Migen will become
7 the foundation for the next-generation Milkymist SoC.
8
9 See doc/migen.txt for a more complete description.
10
11 Code repository:
12 https://github.com/milkymist/migen
13 Experimental version of the Milkymist SoC based on Migen:
14 https://github.com/milkymist/milkymist-ng
15
16 Migen is designed for Python 3.2.
17
18 Send questions, comments and patches to devel [AT] lists.milkymist.org
19 We are also on IRC: #milkymist on the Freenode network.
20
21 Migen is free software: you can redistribute it and/or modify it under
22 the terms of the GNU General Public License as published by the Free
23 Software Foundation, version 3 of the License. This program is
24 distributed in the hope that it will be useful, but WITHOUT ANY
25 WARRANTY; without even the implied warranty of MERCHANTABILITY or
26 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
27 more details.
28
29 Additional permissions under section 7 of the GNU General Public License
30 (GPL) are hereby granted. The purpose of this exception is to allow
31 non-GPL (including proprietary) logic cores to be used in conjunction
32 with code generated by Migen in a design.
33
34 "Generated" code refers to Verilog or VHDL code that has been obtained
35 by converting FHDL structures using Migen.
36
37 To "instantiate" is to include and connect another module as specified
38 in section 12.1.2 of the IEEE standard 1364-2001 or in section 9.6 of
39 the IEEE standard 1076-1993.
40
41 (1) You have permission to propagate a work of generated code that
42 instantiates modules that are not generated code and do not comply
43 with the GPL.
44 (2) You have permission to propagate a work of Verilog or VHDL code that
45 is not generated code, does not comply with the GPL and instantiates
46 generated code.
47
48 The availability of this exception does not imply any general
49 presumption that third-party software is unaffected by the copyleft
50 requirements of the license of Migen.
51
52 Unless otherwise noted, Migen's source code is copyright (C) 2011-2012
53 Sebastien Bourdeauducq. Other authors retain ownership of their
54 contributions. If a submission can reasonably be considered
55 independently copyrightable, it's yours and I encourage you to claim it
56 with appropriate copyright notices. This submission then falls under the
57 "otherwise noted" category. All submissions must use a license
58 compatible with the GPL and the exception above.
59
60 "Electricity! It's like magic!"