mirror of
https://github.com/AsahiLinux/u-boot
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154 lines
7 KiB
Text
154 lines
7 KiB
Text
SPDX-License-Identifier: GPL-2.0
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U-Boot is Free Software. It is copyrighted by Wolfgang Denk and
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many others who contributed code (see the actual source code and the
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git commit messages for details). You can redistribute U-Boot and/or
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modify it under the terms of version 2 of the GNU General Public
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License as published by the Free Software Foundation. Most of it can
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also be distributed, at your option, under any later version of the
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GNU General Public License -- see individual files for exceptions.
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NOTE! This license does *not* cover the so-called "standalone"
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applications that use U-Boot services by means of the jump table
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provided by U-Boot exactly for this purpose - this is merely
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considered normal use of U-Boot, and does *not* fall under the
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heading of "derived work" -- see file Licenses/Exceptions for
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details.
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Also note that the GPL and the other licenses are copyrighted by
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the Free Software Foundation and other organizations, but the
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instance of code that they refer to (the U-Boot source code) is
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copyrighted by me and others who actually wrote it.
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-- Wolfgang Denk
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Like many other projects, U-Boot has a tradition of including big
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blocks of License headers in all files. This not only blows up the
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source code with mostly redundant information, but also makes it very
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difficult to generate License Clearing Reports. An additional problem
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is that even the same licenses are referred to by a number of
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slightly varying text blocks (full, abbreviated, different
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indentation, line wrapping and/or white space, with obsolete address
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information, ...) which makes automatic processing a nightmare.
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To make this easier, such license headers in the source files will be
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replaced with a single line reference to Unique License Identifiers
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as defined by the Linux Foundation's SPDX project [1].
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If a "SPDX-License-Identifier:" line references more than one Unique
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License Identifier, then this means that the respective file can be
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used under the terms of either of these licenses, i. e. with
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SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
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you can choose between GPL-2.0+ and BSD-3-Clause licensing.
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We use the SPDX Unique License Identifiers here; these are available
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at [2].
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License identifier syntax
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-------------------------
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1. Placement:
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The SPDX license identifier in U-Boot files shall be added at the first
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possible line in a file which can contain a comment. For the majority
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or files this is the first line, except for scripts which require the
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'#!PATH_TO_INTERPRETER' in the first line. For those scripts the SPDX
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identifier goes into the second line.
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2. Style:
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The SPDX license identifier is added in form of a comment. The comment
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style depends on the file type::
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C source: // SPDX-License-Identifier: <SPDX License Expression>
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C header: /* SPDX-License-Identifier: <SPDX License Expression> */
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ASM: /* SPDX-License-Identifier: <SPDX License Expression> */
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scripts: # SPDX-License-Identifier: <SPDX License Expression>
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.rst: .. SPDX-License-Identifier: <SPDX License Expression>
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.dts{i}: // SPDX-License-Identifier: <SPDX License Expression>
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If a specific tool cannot handle the standard comment style, then the
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appropriate comment mechanism which the tool accepts shall be used. This
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is the reason for having the "/\* \*/" style comment in C header
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files. There was build breakage observed with generated .lds files where
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'ld' failed to parse the C++ comment. This has been fixed by now, but
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there are still older assembler tools which cannot handle C++ style
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comments.
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3. Syntax:
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A <SPDX License Expression> is either an SPDX short form license
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identifier found on the SPDX License List, or the combination of two
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SPDX short form license identifiers separated by "WITH" when a license
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exception applies. When multiple licenses apply, an expression consists
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of keywords "AND", "OR" separating sub-expressions and surrounded by
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"(", ")" .
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License identifiers for licenses like [L]GPL with the 'or later' option
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are constructed by using a "+" for indicating the 'or later' option.::
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// SPDX-License-Identifier: GPL-2.0+
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// SPDX-License-Identifier: LGPL-2.1+
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WITH should be used when there is a modifier to a license needed.
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For example, the linux kernel UAPI files use the expression::
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// SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
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// SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note
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Other examples using WITH exceptions found in the linux kernel are::
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// SPDX-License-Identifier: GPL-2.0 WITH mif-exception
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// SPDX-License-Identifier: GPL-2.0+ WITH GCC-exception-2.0
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Exceptions can only be used with particular License identifiers. The
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valid License identifiers are listed in the tags of the exception text
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file.
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OR should be used if the file is dual licensed and only one license is
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to be selected. For example, some dtsi files are available under dual
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licenses::
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// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
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Examples from U-Boot for license expressions in dual licensed files::
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// SPDX-License-Identifier: GPL-2.0 OR MIT
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// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
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AND should be used if the file has multiple licenses whose terms all
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apply to use the file. For example, if code is inherited from another
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project and permission has been given to put it in U-Boot, but the
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original license terms need to remain in effect::
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// SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) AND MIT
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Another other example where both sets of license terms need to be
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adhered to is::
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// SPDX-License-Identifier: GPL-1.0+ AND LGPL-2.1+
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[1] http://spdx.org/
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[2] http://spdx.org/licenses/
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Full name SPDX Identifier OSI Approved File name URI
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=======================================================================================================================================
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GNU General Public License v2.0 only GPL-2.0 Y gpl-2.0.txt http://www.gnu.org/licenses/gpl-2.0.txt
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GNU General Public License v2.0 or later GPL-2.0+ Y gpl-2.0.txt http://www.gnu.org/licenses/gpl-2.0.txt
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GNU Library General Public License v2 or later LGPL-2.0+ Y lgpl-2.0.txt http://www.gnu.org/licenses/old-licenses/lgpl-2.0.txt
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GNU Lesser General Public License v2.1 or later LGPL-2.1+ Y lgpl-2.1.txt http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt
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eCos license version 2.0 eCos-2.0 eCos-2.0.txt http://www.gnu.org/licenses/ecos-license.html
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BSD 2-Clause License BSD-2-Clause Y bsd-2-clause.txt http://spdx.org/licenses/BSD-2-Clause
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BSD 3-clause "New" or "Revised" License BSD-3-Clause Y bsd-3-clause.txt http://spdx.org/licenses/BSD-3-Clause#licenseText
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IBM PIBS (PowerPC Initialization and IBM-pibs ibm-pibs.txt
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Boot Software) license
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ISC License ISC Y isc.txt https://spdx.org/licenses/ISC
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MIT License MIT Y mit.txt https://spdx.org/licenses/MIT.html
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SIL OPEN FONT LICENSE (OFL-1.1) OFL-1.1 Y OFL.txt https://spdx.org/licenses/OFL-1.1.html
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X11 License X11 x11.txt https://spdx.org/licenses/X11.html
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