u-boot/config.mk

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2002-11-02 23:30:20 +00:00
#
Licenses: introduce SPDX Unique Lincense Identifiers 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 lincenses 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 Lincense 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+ We use the SPDX Unique Lincense Identifiers here; these are available at [2]. Note: From the legal point of view, this patch is supposed to be only a change to the textual representation of the license information, but in no way any change to the actual license terms. With this patch applied, all files will still be licensed under the same terms they were before. Note 2: The apparent difference between the old "COPYING" and the new "Licenses/gpl-2.0.txt" only results from switching to the upstream version of the license which is differently formatted; there are not any actual changes to the content. Note 3: There are some recurring questions about linense issues, such as: - Is a "All Rights Reserved" clause a problem in GPL code? - Are files without any license header a problem? - Do we need license headers at all? The following excerpt from an e-mail by Daniel B. Ravicher should help with these: | Message-ID: <4ADF8CAA.5030808@softwarefreedom.org> | Date: Wed, 21 Oct 2009 18:35:22 -0400 | From: "Daniel B. Ravicher" <ravicher@softwarefreedom.org> | To: Wolfgang Denk <wd@denx.de> | Subject: Re: GPL and license cleanup questions | | Mr. Denk, | | Wolfgang Denk wrote: | > - There are a number of files which do not include any specific | > license information at all. Is it correct to assume that these files | > are automatically covered by the "GPL v2 or later" clause as | > specified by the COPYING file in the top level directory of the | > U-Boot source tree? | | That is a very fact specific analysis and could be different across the | various files. However, if the contributor could reasonably be expected | to have known that the project was licensed GPLv2 or later at the time | she made her contribution, then a reasonably implication is that she | consented to her contributions being distributed under those terms. | | > - Do such files need any clean up, for example should we add GPL | > headers to them, or is this not needed? | | If the project as a whole is licensed under clear terms, you need not | identify those same terms in each file, although there is no harm in | doing so. | | > - There are other files, which include both a GPL license header | > _plus_ some copyright note with an "All Rights Reserved" clause. It | > has been my understanding that this is a conflict, and me must ask | > the copyright holders to remove such "All Rights Reserved" clauses. | > But then, some people claim that "All Rights Reserved" is a no-op | > nowadays. License checking tools (like OSLC) seem to indicate this is | > a problem, but then we see quite a lot of "All rights reserved" in | > BSD-licensed files in gcc and glibc. So what is the correct way to | > deal with such files? | | It is not a conflict to grant a license and also reserve all rights, as | implicit in that language is that you are reserving all "other" rights | not granted in the license. Thus, a file with "Licensed under GPL, All | Rights Reserved" would mean that it is licensed under the GPL, but no | other rights are given to copy, modify or redistribute it. | | Warm regards, | --Dan | | Daniel B. Ravicher, Legal Director | Software Freedom Law Center (SFLC) and Moglen Ravicher LLC | 1995 Broadway, 17th Fl., New York, NY 10023 | (212) 461-1902 direct (212) 580-0800 main (212) 580-0898 fax | ravicher@softwarefreedom.org www.softwarefreedom.org [1] http://spdx.org/ [2] http://spdx.org/licenses/ Signed-off-by: Wolfgang Denk <wd@denx.de>
2013-06-21 08:22:36 +00:00
# (C) Copyright 2000-2013
2002-11-02 23:30:20 +00:00
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
#
Licenses: introduce SPDX Unique Lincense Identifiers 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 lincenses 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 Lincense 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+ We use the SPDX Unique Lincense Identifiers here; these are available at [2]. Note: From the legal point of view, this patch is supposed to be only a change to the textual representation of the license information, but in no way any change to the actual license terms. With this patch applied, all files will still be licensed under the same terms they were before. Note 2: The apparent difference between the old "COPYING" and the new "Licenses/gpl-2.0.txt" only results from switching to the upstream version of the license which is differently formatted; there are not any actual changes to the content. Note 3: There are some recurring questions about linense issues, such as: - Is a "All Rights Reserved" clause a problem in GPL code? - Are files without any license header a problem? - Do we need license headers at all? The following excerpt from an e-mail by Daniel B. Ravicher should help with these: | Message-ID: <4ADF8CAA.5030808@softwarefreedom.org> | Date: Wed, 21 Oct 2009 18:35:22 -0400 | From: "Daniel B. Ravicher" <ravicher@softwarefreedom.org> | To: Wolfgang Denk <wd@denx.de> | Subject: Re: GPL and license cleanup questions | | Mr. Denk, | | Wolfgang Denk wrote: | > - There are a number of files which do not include any specific | > license information at all. Is it correct to assume that these files | > are automatically covered by the "GPL v2 or later" clause as | > specified by the COPYING file in the top level directory of the | > U-Boot source tree? | | That is a very fact specific analysis and could be different across the | various files. However, if the contributor could reasonably be expected | to have known that the project was licensed GPLv2 or later at the time | she made her contribution, then a reasonably implication is that she | consented to her contributions being distributed under those terms. | | > - Do such files need any clean up, for example should we add GPL | > headers to them, or is this not needed? | | If the project as a whole is licensed under clear terms, you need not | identify those same terms in each file, although there is no harm in | doing so. | | > - There are other files, which include both a GPL license header | > _plus_ some copyright note with an "All Rights Reserved" clause. It | > has been my understanding that this is a conflict, and me must ask | > the copyright holders to remove such "All Rights Reserved" clauses. | > But then, some people claim that "All Rights Reserved" is a no-op | > nowadays. License checking tools (like OSLC) seem to indicate this is | > a problem, but then we see quite a lot of "All rights reserved" in | > BSD-licensed files in gcc and glibc. So what is the correct way to | > deal with such files? | | It is not a conflict to grant a license and also reserve all rights, as | implicit in that language is that you are reserving all "other" rights | not granted in the license. Thus, a file with "Licensed under GPL, All | Rights Reserved" would mean that it is licensed under the GPL, but no | other rights are given to copy, modify or redistribute it. | | Warm regards, | --Dan | | Daniel B. Ravicher, Legal Director | Software Freedom Law Center (SFLC) and Moglen Ravicher LLC | 1995 Broadway, 17th Fl., New York, NY 10023 | (212) 461-1902 direct (212) 580-0800 main (212) 580-0898 fax | ravicher@softwarefreedom.org www.softwarefreedom.org [1] http://spdx.org/ [2] http://spdx.org/licenses/ Signed-off-by: Wolfgang Denk <wd@denx.de>
2013-06-21 08:22:36 +00:00
# SPDX-License-Identifier: GPL-2.0+
2002-11-02 23:30:20 +00:00
#
#########################################################################
kbuild: improve Kbuild speed Kbuild brought about many advantages for us but a significant performance regression was reported by Simon Glass. After some discussions and analysis, it turned out its main cause is in $(call cc-option,...). Historically, U-Boot parses all config.mk (arch/*/config.mk and board/*/config.mk) every time descending into subdirectories. That means cc-options are evaluated over and over again. $(call cc-option,...) is useful but costly. So we want to evaluate them only in ./Makefile and spl/Makefile and export compiler flags. This commit changes the build system as follows: - Modify scripts/Makefile.build to not include config.mk Instead, add $(PLATFORM_CPPFLAGS) to asflags-y, ccflags-y, cppflags-y. - Export many variables Going forward, Kbuild will not parse config.mk files when it descends into subdirectories. If we want to set variables in config.mk and use them in subdirectories, they must be exported. This is the list of variables to get exported: PLATFORM_CPPFLAGS CPUDIR BOARDDIR OBJCOPYFLAGS LDFLAGS LDFLAGS_FINAL (used in nand_spl/board/*/*/Makefile) CONFIG_STANDALONE_LOAD_ADDR (used in examples/standalone/Makefile) SYM_PREFIX (used in examples/standalone/Makefile) RELFLAGS (used in examples/standalone/Makefile) - Delete CPPFLAGS This variable has been replaced with PLATFORM_CPPFLAGS - Copy gcclibdir from example/standalone/Makefile to arch/sparc/config.mk The reference in CONFIG_STANDALONE_LOAD_ADDR must be resolved before it is exported. Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com> Reported-by: Simon Glass <sjg@chromium.org> Acked-by: Simon Glass <sjg@chromium.org> Tested-by: Simon Glass <sjg@chromium.org> [on Sandbox] Tested-by: Stephen Warren <swarren@nvidia.com> [on Tegra]
2014-03-05 07:59:40 +00:00
# This file is included from ./Makefile and spl/Makefile.
# Clean the state to avoid the same flags added twice.
#
# (Tegra needs different flags for SPL.
# That's the reason why this file must be included from spl/Makefile too.
# If we did not have Tegra SoCs, build system would be much simpler...)
PLATFORM_RELFLAGS :=
PLATFORM_CPPFLAGS :=
PLATFORM_LDFLAGS :=
LDFLAGS :=
LDFLAGS_FINAL :=
OBJCOPYFLAGS :=
#########################################################################
# Some architecture config.mk files need to know what CPUDIR is set to,
# so calculate CPUDIR before including ARCH/SOC/CPU config.mk files.
# Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains
# CPU-specific code.
CPUDIR=arch/$(ARCH)/cpu$(if $(CPU),/$(CPU),)
sinclude $(srctree)/arch/$(ARCH)/config.mk # include architecture dependend rules
sinclude $(srctree)/$(CPUDIR)/config.mk # include CPU specific rules
ifdef SOC
sinclude $(srctree)/$(CPUDIR)/$(SOC)/config.mk # include SoC specific rules
endif
ifneq ($(BOARD),)
ifdef VENDOR
BOARDDIR = $(VENDOR)/$(BOARD)
else
BOARDDIR = $(BOARD)
endif
endif
ifdef BOARD
sinclude $(srctree)/board/$(BOARDDIR)/config.mk # include board specific rules
endif
#########################################################################
kbuild: improve Kbuild speed Kbuild brought about many advantages for us but a significant performance regression was reported by Simon Glass. After some discussions and analysis, it turned out its main cause is in $(call cc-option,...). Historically, U-Boot parses all config.mk (arch/*/config.mk and board/*/config.mk) every time descending into subdirectories. That means cc-options are evaluated over and over again. $(call cc-option,...) is useful but costly. So we want to evaluate them only in ./Makefile and spl/Makefile and export compiler flags. This commit changes the build system as follows: - Modify scripts/Makefile.build to not include config.mk Instead, add $(PLATFORM_CPPFLAGS) to asflags-y, ccflags-y, cppflags-y. - Export many variables Going forward, Kbuild will not parse config.mk files when it descends into subdirectories. If we want to set variables in config.mk and use them in subdirectories, they must be exported. This is the list of variables to get exported: PLATFORM_CPPFLAGS CPUDIR BOARDDIR OBJCOPYFLAGS LDFLAGS LDFLAGS_FINAL (used in nand_spl/board/*/*/Makefile) CONFIG_STANDALONE_LOAD_ADDR (used in examples/standalone/Makefile) SYM_PREFIX (used in examples/standalone/Makefile) RELFLAGS (used in examples/standalone/Makefile) - Delete CPPFLAGS This variable has been replaced with PLATFORM_CPPFLAGS - Copy gcclibdir from example/standalone/Makefile to arch/sparc/config.mk The reference in CONFIG_STANDALONE_LOAD_ADDR must be resolved before it is exported. Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com> Reported-by: Simon Glass <sjg@chromium.org> Acked-by: Simon Glass <sjg@chromium.org> Tested-by: Simon Glass <sjg@chromium.org> [on Sandbox] Tested-by: Stephen Warren <swarren@nvidia.com> [on Tegra]
2014-03-05 07:59:40 +00:00
RELFLAGS := $(PLATFORM_RELFLAGS)
2011-04-06 13:31:37 +00:00
OBJCOPYFLAGS += --gap-fill=0xff
2002-11-02 23:30:20 +00:00
kbuild: improve Kbuild speed Kbuild brought about many advantages for us but a significant performance regression was reported by Simon Glass. After some discussions and analysis, it turned out its main cause is in $(call cc-option,...). Historically, U-Boot parses all config.mk (arch/*/config.mk and board/*/config.mk) every time descending into subdirectories. That means cc-options are evaluated over and over again. $(call cc-option,...) is useful but costly. So we want to evaluate them only in ./Makefile and spl/Makefile and export compiler flags. This commit changes the build system as follows: - Modify scripts/Makefile.build to not include config.mk Instead, add $(PLATFORM_CPPFLAGS) to asflags-y, ccflags-y, cppflags-y. - Export many variables Going forward, Kbuild will not parse config.mk files when it descends into subdirectories. If we want to set variables in config.mk and use them in subdirectories, they must be exported. This is the list of variables to get exported: PLATFORM_CPPFLAGS CPUDIR BOARDDIR OBJCOPYFLAGS LDFLAGS LDFLAGS_FINAL (used in nand_spl/board/*/*/Makefile) CONFIG_STANDALONE_LOAD_ADDR (used in examples/standalone/Makefile) SYM_PREFIX (used in examples/standalone/Makefile) RELFLAGS (used in examples/standalone/Makefile) - Delete CPPFLAGS This variable has been replaced with PLATFORM_CPPFLAGS - Copy gcclibdir from example/standalone/Makefile to arch/sparc/config.mk The reference in CONFIG_STANDALONE_LOAD_ADDR must be resolved before it is exported. Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com> Reported-by: Simon Glass <sjg@chromium.org> Acked-by: Simon Glass <sjg@chromium.org> Tested-by: Simon Glass <sjg@chromium.org> [on Sandbox] Tested-by: Stephen Warren <swarren@nvidia.com> [on Tegra]
2014-03-05 07:59:40 +00:00
PLATFORM_CPPFLAGS += $(RELFLAGS)
PLATFORM_CPPFLAGS += -pipe
LDFLAGS += $(PLATFORM_LDFLAGS)
LDFLAGS_FINAL += -Bstatic
kbuild: improve Kbuild speed Kbuild brought about many advantages for us but a significant performance regression was reported by Simon Glass. After some discussions and analysis, it turned out its main cause is in $(call cc-option,...). Historically, U-Boot parses all config.mk (arch/*/config.mk and board/*/config.mk) every time descending into subdirectories. That means cc-options are evaluated over and over again. $(call cc-option,...) is useful but costly. So we want to evaluate them only in ./Makefile and spl/Makefile and export compiler flags. This commit changes the build system as follows: - Modify scripts/Makefile.build to not include config.mk Instead, add $(PLATFORM_CPPFLAGS) to asflags-y, ccflags-y, cppflags-y. - Export many variables Going forward, Kbuild will not parse config.mk files when it descends into subdirectories. If we want to set variables in config.mk and use them in subdirectories, they must be exported. This is the list of variables to get exported: PLATFORM_CPPFLAGS CPUDIR BOARDDIR OBJCOPYFLAGS LDFLAGS LDFLAGS_FINAL (used in nand_spl/board/*/*/Makefile) CONFIG_STANDALONE_LOAD_ADDR (used in examples/standalone/Makefile) SYM_PREFIX (used in examples/standalone/Makefile) RELFLAGS (used in examples/standalone/Makefile) - Delete CPPFLAGS This variable has been replaced with PLATFORM_CPPFLAGS - Copy gcclibdir from example/standalone/Makefile to arch/sparc/config.mk The reference in CONFIG_STANDALONE_LOAD_ADDR must be resolved before it is exported. Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com> Reported-by: Simon Glass <sjg@chromium.org> Acked-by: Simon Glass <sjg@chromium.org> Tested-by: Simon Glass <sjg@chromium.org> [on Sandbox] Tested-by: Stephen Warren <swarren@nvidia.com> [on Tegra]
2014-03-05 07:59:40 +00:00
export PLATFORM_CPPFLAGS
export RELFLAGS
export LDFLAGS_FINAL
export CONFIG_STANDALONE_LOAD_ADDR