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https://github.com/AsahiLinux/u-boot
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51148790f2
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>
100 lines
3.2 KiB
Makefile
100 lines
3.2 KiB
Makefile
# This helper makefile is used for creating
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# - symbolic links (arch/$ARCH/include/asm/arch
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# - include/autoconf.mk, {spl,tpl}/include/autoconf.mk
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# - include/config.h
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#
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# When our migration to Kconfig is done
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# (= When we move all CONFIGs from header files to Kconfig)
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# this makefile can be deleted.
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# obj is "include" or "spl/include" or "tpl/include"
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# for non-SPL, SPL, TPL, respectively
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include $(obj)/config/auto.conf
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include scripts/Kbuild.include
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# Need to define CC and CPP again here in case the top Makefile did not
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# include config.mk. Some architectures expect CROSS_COMPILE to be defined
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# in arch/$(ARCH)/config.mk
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CC = $(CROSS_COMPILE)gcc
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CPP = $(CC) -E
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include config.mk
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UBOOTINCLUDE := \
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-I$(obj) \
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-Iinclude \
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$(if $(KBUILD_SRC), -I$(srctree)/include) \
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-I$(srctree)/arch/$(ARCH)/include \
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-include $(srctree)/include/linux/kconfig.h
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c_flags := $(KBUILD_CFLAGS) $(KBUILD_CPPFLAGS) $(PLATFORM_CPPFLAGS) \
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$(UBOOTINCLUDE) $(NOSTDINC_FLAGS)
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quiet_cmd_autoconf_dep = GEN $@
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cmd_autoconf_dep = $(CC) -x c -DDO_DEPS_ONLY -M -MP $(c_flags) \
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-MQ include/config/auto.conf $(srctree)/include/common.h > $@ || { \
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rm $@; false; \
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}
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include/autoconf.mk.dep: FORCE
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$(call cmd,autoconf_dep)
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# We are migrating from board headers to Kconfig little by little.
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# In the interim, we use both of
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# - include/config/auto.conf (generated by Kconfig)
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# - include/autoconf.mk (used in the U-Boot conventional configuration)
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# The following rule creates autoconf.mk
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# include/config/auto.conf is grepped in order to avoid duplication of the
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# same CONFIG macros
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quiet_cmd_autoconf = GEN $@
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cmd_autoconf = \
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$(CPP) $(c_flags) -DDO_DEPS_ONLY -dM $(srctree)/include/common.h > $@.tmp && { \
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sed -n -f $(srctree)/tools/scripts/define2mk.sed $@.tmp | \
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while read line; do \
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if ! grep -q "$${line%=*}=" $(obj)/config/auto.conf; then \
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echo "$$line"; \
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fi \
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done > $@; \
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rm $@.tmp; \
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} || { \
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rm $@.tmp; false; \
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}
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$(obj)/autoconf.mk: FORCE
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$(call cmd,autoconf)
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include/autoconf.mk include/autoconf.mk.dep: include/config.h
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# include/config.h
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# Prior to Kconfig, it was generated by mkconfig. Now it is created here.
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define filechk_config_h
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(echo "/* Automatically generated - do not edit */"; \
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for i in $$(echo $(CONFIG_SYS_EXTRA_OPTIONS) | sed 's/,/ /g'); do \
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echo \#define CONFIG_$$i \
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| sed '/=/ {s/=/ /;q; } ; { s/$$/ 1/; }'; \
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done; \
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echo \#define CONFIG_BOARDDIR board/$(if $(VENDOR),$(VENDOR)/)$(BOARD);\
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echo \#include \<config_cmd_defaults.h\>; \
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echo \#include \<config_defaults.h\>; \
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echo \#include \<configs/$(CONFIG_SYS_CONFIG_NAME).h\>; \
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echo \#include \<asm/config.h\>; \
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echo \#include \<config_fallbacks.h\>; \
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echo \#include \<config_uncmd_spl.h\>; )
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endef
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include/config.h: scripts/Makefile.autoconf create_symlink FORCE
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$(call filechk,config_h)
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# symbolic links
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PHONY += create_symlink
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create_symlink:
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ifneq ($(KBUILD_SRC),)
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$(Q)mkdir -p include/asm
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endif
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$(Q)ln -fsn $(srctree)/arch/$(ARCH)/include/asm/arch-$(if $(SOC),$(SOC),$(CPU)) \
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$(if $(KBUILD_SRC),,arch/$(ARCH)/)include/asm/arch
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PHONY += FORCE
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FORCE:
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.PHONY: $(PHONY)
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