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Since Linux 3.15, relative path feature and related fixes,
cleanups have been merged to the top Makefile.
The relative path feature looks stable enough, so let's import it
to U-Boot along with various cleanups.
Commits imported from Linux (some need adjustment) are:
[1] commit 7e1c04779efd by Michal Marek
kbuild: Use relative path for $(objtree)
[2] commit 890676c65d69 by Michal Marek
kbuild: Use relative path when building in the source tree
[3] commit 9da0763bdd82 by Michal Marek
kbuild: Use relative path when building in a subdir of the source tree
[4] commit c2e28dc975ea by Michal Marek
kbuild: Print the name of the build directory
[5] commit 066b7ed95580 by Michal Marek
kbuild: Do not print the build directory with make -s
[6] commit 3f1d9a6cec01 by Michal Marek
kbuild: make -s should be used with kernelrelease/kernelversion/image_name
[7] commit 7ff525712acf by Masahiro Yamada
kbuild: fake the "Entering directory ..." message more simply
[8] commit 745a254322c8 by Masahiro Yamada
kbuild: use $(Q) for sub-make target
[9] commit aa55c8e2f7a3 by Masahiro Yamada
kbuild: handle C=... and M=... after entering into build directory
[10] commit ab7474ea5361 by Borislav Petkov
Kbuild: Ignore GREP_OPTIONS env variable
To use relative path feature, tools/Makefile and scripts/Makefile.autoconf
must be tweaked.
Signed-off-by: Michal Marek <mmarek@suse.cz>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
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This commit enables Kconfig.
Going forward, we use Kconfig for the board configuration.
mkconfig will never be used. Nor will include/config.mk be generated.
Kconfig must be adjusted for U-Boot because our situation is
a little more complicated than Linux Kernel.
We have to generate multiple boot images (Normal, SPL, TPL)
from one source tree.
Each image needs its own configuration input.
Usage:
Run "make <board>_defconfig" to do the board configuration.
It will create the .config file and additionally spl/.config, tpl/.config
if SPL, TPL is enabled, respectively.
You can use "make config", "make menuconfig" etc. to create
a new .config or modify the existing one.
Use "make spl/config", "make spl/menuconfig" etc. for spl/.config
and do likewise for tpl/.config file.
The generic syntax of configuration targets for SPL, TPL is:
<target_image>/<config_command>
Here, <target_image> is either 'spl' or 'tpl'
<config_command> is 'config', 'menuconfig', 'xconfig', etc.
When the configuration is done, run "make".
(Or "make <board>_defconfig all" will do the configuration and build
in one time.)
For futher information of how Kconfig works in U-Boot,
please read the comment block of scripts/multiconfig.py.
By the way, there is another item worth remarking here:
coexistence of Kconfig and board herder files.
Prior to Kconfig, we used C headers to define a set of configs.
We expect a very long term to migrate from C headers to Kconfig.
Two different infractructure must coexist in the interim.
In our former configuration scheme, include/autoconf.mk was generated
for use in makefiles.
It is still generated under include/, spl/include/, tpl/include/ directory
for the Normal, SPL, TPL image, respectively.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Acked-by: Simon Glass <sjg@chromium.org>
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