.config生成

最新推荐文章于 2024-04-23 13:05:07 发布

zll5258

最新推荐文章于 2024-04-23 13:05:07 发布

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分类专栏： linux-编译篇文章标签： makefile linux config msm_defconfig

本文链接：https://blog.youkuaiyun.com/zll5258/article/details/50985486

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这篇博客详细介绍了Linux内核配置文件.config的生成步骤。从执行envsetup.sh开始，解析BoardConfig.mk，到Kernel/AndroidKernel.mk中确定KERNEL_DEFCONFIG，接着使用scripts/kconfig/Makefile和conf工具进行配置。最后在kernel/makefile及相关makefile.build文件中编译生成.conf文件，整个过程涉及到了配置文件的合并和依赖关系。

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(1)命令执行追溯

Sourcebuild/envsetup.sh

执行envsetup.sh脚本，把(TARGET_DEVICE)/BoardConfig.mk包含了进来

build/envsetup.sh:628: localTOPFILE=build/core/envsetup.mk

-->build/core/envsetup.mk:161: $(shell test -d device && find device -maxdepth 4 -path '*/$(TARGET_DEVICE)/BoardConfig.mk') \

下面为里面的内容

CPXXX/AndroidBoard.mk:34:includekernel/AndroidKernel.mk

device/yulong/CPXXX/AndroidBoard.mk

21 ifeq ($(KERNEL_DEFCONFIG),)

22 ifeq ($(TARGET_BUILD_VARIANT),user)

23 KERNEL_DEFCONFIG := msm-perf_defconfig

24 else

25 KERNEL_DEFCONFIG:= msm_defconfig

26 endif

27 endif

（2）进入Kernel/AndroidKernel.mk

24 KERNEL_HEADER_DEFCONFIG := $(strip$(KERNEL_HEADER_DEFCONFIG))

25 ifeq ($(KERNEL_HEADER_DEFCONFIG),)

26 KERNEL_HEADER_DEFCONFIG:= $(KERNEL_DEFCONFIG)

27 endif

50 KERNEL_OUT :=$(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ

51 KERNEL_CONFIG :=$(KERNEL_OUT)/.config //----------------------------目标文件

99 $(KERNEL_CONFIG): $(KERNEL_OUT)

100 $(MAKE) -C kernel O=../$(KERNEL_OUT)ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(KERNEL_DEFCONFIG)

101 $(hide) if [ ! -z"$(KERNEL_CONFIG_OVERRIDE)" ]; then \

102 echo "Overridingkernel config with '$(KERNEL_CONFIG_OVERRIDE)'"; \

103 echo$(KERNEL_CONFIG_OVERRIDE) >> $(KERNEL_OUT)/.config; \

104 $(MAKE) -C kernelO=../$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE)oldconfig; fi

（3）kernel/scripts/kconfig/Makefile

106 %_defconfig:$(obj)/conf

107 $(Q)bash$(srctree)/scripts/kconfig/yl_config.sh $@

108 $(Q)$<--defconfig=arch/$(SRCARCH)/configs/.$@ $(Kconfig)

由上面可知需要依赖scripts/kconfig/conf

（4）scripts/kconfig/conf工具生成如下：

156 conf-objs := conf.o zconf.tab.o

157 mconf-objs := mconf.o zconf.tab.o $(lxdialog)

158 nconf-objs := nconf.o zconf.tab.o nconf.gui.o

159kxgettext-objs := kxgettext.ozconf.tab.o

160qconf-cxxobjs := qconf.o

161 qconf-objs := zconf.tab.o

162 gconf-objs := gconf.o zconf.tab.o

163

164 hostprogs-y := conf

（5）进入kernel/makefile

793 export KBUILD_ALLDIRS := $(sort$(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)

进入kernel/scripts/makefile.build

114 ifneq($(hostprogs-y)$(hostprogs-m),)

115 include scripts/Makefile.host

116 endif

(6)进入scripts/Makefile.host

33 __hostprogs :=$(sort $(hostprogs-y) $(hostprogs-m))

//---------------为conf

45 host-cobjs := $(sort $(foreachm,$(__hostprogs),$($(m)-objs)))

//----------------conf.o zconf.tab.o

125quiet_cmd_host-cmulti = HOSTLD $@

126 cmd_host-cmulti = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \

127 $(addprefix$(obj)/,$($(@F)-objs)) \

128 $(HOST_LOADLIBES)$(HOSTLOADLIBES_$(@F))

129 $(host-cmulti):$(obj)/%: $(host-cobjs)$(host-cshlib) FORCE

130 $(call if_changed,host-cmulti)

(7)回到kernel/scripts/kconfig/Makefile

$(Q)$<--defconfig=arch/$(SRCARCH)/configs/.$@ $(Kconfig)

scripts/kconfig/conf --defconfig=arch/arm64/configs/.msm_defconfig Kconfig

需要了解多有的kconfig如何合在一起