U-Boot is Free Software.  It is copyrighted by Wolfgang Denk and
  many others who contributed code (see the actual source code and the
  git commit messages for details).  You can redistribute U-Boot and/or
  modify it under the terms of version 2 of the GNU General Public
  License as published by the Free Software Foundation.  Most of it can
  also be distributed, at your option, under any later version of the
  GNU General Public License -- see individual files for exceptions.
  
    NOTE! This license does *not* cover the so-called "standalone"
  applications that use U-Boot services by means of the jump table
  provided by U-Boot exactly for this purpose - this is merely
  considered normal use of U-Boot, and does *not* fall under the
  heading of "derived work" -- see file  Licenses/Exceptions  for
  details.
  
    Also note that the GPL and the other licenses are copyrighted by
  the Free Software Foundation and other organizations, but the
  instance of code that they refer to (the U-Boot source code) is
  copyrighted by me and others who actually wrote it.
  -- Wolfgang Denk
  
  
  Like many other projects, U-Boot has a tradition of including big
  blocks of License headers in all files.  This not only blows up the
  source code with mostly redundant information, but also makes it very
  difficult to generate License Clearing Reports.  An additional problem
  is that even the same licenses are referred to by a number of
  slightly varying text blocks (full, abbreviated, different
  indentation, line wrapping and/or white space, with obsolete address
  information, ...) which makes automatic processing a nightmare.
  
  To make this easier, such license headers in the source files will be
  replaced with a single line reference to Unique License Identifiers
  as defined by the Linux Foundation's SPDX project [1].  For example,
  in a source file the full "GPL v2.0 or later" header text will be
  replaced by a single line:
  
  	SPDX-License-Identifier:	GPL-2.0+

  Ideally, the license terms of all files in the source tree should be
  defined by such License Identifiers; in no case a file can contain
  more than one such License Identifier list.
  
  If a "SPDX-License-Identifier:" line references more than one Unique
  License Identifier, then this means that the respective file can be
  used under the terms of either of these licenses, i. e. with
  
  	SPDX-License-Identifier:	GPL-2.0+	BSD-3-Clause

  you can choose between GPL-2.0+ and BSD-3-Clause licensing.

  We use the SPDX Unique License Identifiers here; these are available
  at [2].
  
  [1] http://spdx.org/
  [2] http://spdx.org/licenses/

  Full name					SPDX Identifier	OSI Approved	File name		URI

  =======================================================================================================================================

  GNU General Public License v2.0 only		GPL-2.0		Y		gpl-2.0.txt		http://www.gnu.org/licenses/gpl-2.0.txt
  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
  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
  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
  eCos license version 2.0			eCos-2.0			eCos-2.0.txt		http://www.gnu.org/licenses/ecos-license.html

  BSD 2-Clause License				BSD-2-Clause	Y		bsd-2-clause.txt	http://spdx.org/licenses/BSD-2-Clause
  BSD 3-clause "New" or "Revised" License		BSD-3-Clause	Y		bsd-3-clause.txt	http://spdx.org/licenses/BSD-3-Clause#licenseText

  IBM PIBS (PowerPC Initialization and		IBM-pibs			ibm-pibs.txt

  	Boot Software) license

  ISC License					ISC		Y		isc.txt			https://spdx.org/licenses/ISC

  SIL OPEN FONT LICENSE (OFL-1.1)			OFL-1.1		Y		OFL.txt			https://spdx.org/licenses/OFL-1.1.html

  X11 License					X11				x11.txt			https://spdx.org/licenses/X11.html