On 23 April 2014 23:04, Masahiro Yamada <yamad...@jp.panasonic.com> wrote: > This commit enables Kconfig. > Going forward, we use Kconfig for 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 3 images at most: Main image, SPL, TPL. > And each of them can have a different set of CONFIG macros. > > In order to keep this scheme in Kconfig, some files must be modified. > But the modification should be minimum. > > The location of Kconfig related files is as follows: > > [1] Main > - .config (saved CONFIG list) > - include/config/auto.conf (for use in makefiles) > - include/generated/autoconf.h (for use in C sources) > - include/config/* (for if_changed_dep) > > [2] SPL > - spl/.config (saved CONFIG list) > - spl/include/config/auto.conf (for use in makefiles) > - spl/include/generated/autoconf.h (for use in C sources) > - spl/include/config/* (for if_changed_dep) > > [3] TPL > - tpl/.config (saved CONFIG list) > - tpl/include/config/auto.conf (for use in makefiles) > - tpl/include/generated/autoconf.h (for use in C sources) > - tpl/include/config/* (for if_changed_dep) > > Usage: > > Execute "make <board>_defconfig" to configure board and then run "make". > Or "make <board>_defconfig all" to configure and build in one time. > > To modify configuration, run "make config", "make menuconfig", etc. > To see the other configuration targets execute "make help". > > In Kconfig for U-boot, the configuration is done on three levels at most. > > "make menuconfig" will show a menu with a blue background for the > main configuration. > > Enable "Build SPL image", "Build TPL image" under "General setup" > to build SPL, TPL, respectively. > > After modifying settings, choose <Exit>. > CONFIG macros will be saved into ".config" file. > > If SPL build is enabled, the second menu for SPL configuration > will come up. > > And if TPL build is also enabled, the third menu for TPL will > be displayed. > > By the way, there is another item worth remarking here: > coexistence of Kconfig and board herder files. > > To define the set of CONFIG macros, we have used C headers. > > We expect long term to move existing CONFIG macros to Kconfig. > Two different infractructure must coexist in the interim. > > Prior to Kconfig, include/autoconf.mk, include/spl-autoconf.mk, > include/tpl-autoconf.mk were generated from the config header > for the use in makefiles. > > They are still supported in Kconfig for U-Boot. > They are created at the beginning of the build and merged into > include/config/auto.conf, spl/include/config/auto.conf, > tpl/include/config/auto.conf, respectively. > > Signed-off-by: Masahiro Yamada <yamad...@jp.panasonic.com>
Reviewed-by: Simon Glass <s...@chromium.org> _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
