README 3.8 KB

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  1. U-Boot is Free Software. It is copyrighted by Wolfgang Denk and
  2. many others who contributed code (see the actual source code and the
  3. git commit messages for details). You can redistribute U-Boot and/or
  4. modify it under the terms of version 2 of the GNU General Public
  5. License as published by the Free Software Foundation. Most of it can
  6. also be distributed, at your option, under any later version of the
  7. GNU General Public License -- see individual files for exceptions.
  8. NOTE! This license does *not* cover the so-called "standalone"
  9. applications that use U-Boot services by means of the jump table
  10. provided by U-Boot exactly for this purpose - this is merely
  11. considered normal use of U-Boot, and does *not* fall under the
  12. heading of "derived work" -- see file Licenses/Exceptions for
  13. details.
  14. Also note that the GPL and the other licenses are copyrighted by
  15. the Free Software Foundation and other organizations, but the
  16. instance of code that they refer to (the U-Boot source code) is
  17. copyrighted by me and others who actually wrote it.
  18. -- Wolfgang Denk
  19. Like many other projects, U-Boot has a tradition of including big
  20. blocks of License headers in all files. This not only blows up the
  21. source code with mostly redundant information, but also makes it very
  22. difficult to generate License Clearing Reports. An additional problem
  23. is that even the same licenses are referred to by a number of
  24. slightly varying text blocks (full, abbreviated, different
  25. indentation, line wrapping and/or white space, with obsolete address
  26. information, ...) which makes automatic processing a nightmare.
  27. To make this easier, such license headers in the source files will be
  28. replaced with a single line reference to Unique License Identifiers
  29. as defined by the Linux Foundation's SPDX project [1]. For example,
  30. in a source file the full "GPL v2.0 or later" header text will be
  31. replaced by a single line:
  32. SPDX-License-Identifier: GPL-2.0+
  33. Ideally, the license terms of all files in the source tree should be
  34. defined by such License Identifiers; in no case a file can contain
  35. more than one such License Identifier list.
  36. If a "SPDX-License-Identifier:" line references more than one Unique
  37. License Identifier, then this means that the respective file can be
  38. used under the terms of either of these licenses, i. e. with
  39. SPDX-License-Identifier: GPL-2.0+ BSD-3-Clause
  40. you can choose between GPL-2.0+ and BSD-3-Clause licensing.
  41. We use the SPDX Unique License Identifiers here; these are available
  42. at [2].
  43. [1] http://spdx.org/
  44. [2] http://spdx.org/licenses/
  45. Full name SPDX Identifier OSI Approved File name URI
  46. =======================================================================================================================================
  47. GNU General Public License v2.0 only GPL-2.0 Y gpl-2.0.txt http://www.gnu.org/licenses/gpl-2.0.txt
  48. 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
  49. 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
  50. 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
  51. eCos license version 2.0 eCos-2.0 eCos-2.0.txt http://www.gnu.org/licenses/ecos-license.html
  52. BSD 2-Clause License BSD-2-Clause Y bsd-2-clause.txt http://spdx.org/licenses/BSD-2-Clause
  53. BSD 3-clause "New" or "Revised" License BSD-3-Clause Y bsd-3-clause.txt http://spdx.org/licenses/BSD-3-Clause#licenseText
  54. IBM PIBS (PowerPC Initialization and IBM-pibs ibm-pibs.txt
  55. Boot Software) license
  56. ISC License ISC Y isc.txt https://spdx.org/licenses/ISC
  57. SIL OPEN FONT LICENSE (OFL-1.1) OFL-1.1 Y OFL.txt https://spdx.org/licenses/OFL-1.1.html
  58. X11 License X11 x11.txt https://spdx.org/licenses/X11.html