22-Openwrt 使用外部kernel和kernel_config

由于内核的修改要通过打patch的方式会比较麻烦,有时候我们会把内核直接解压出来用修改源码的方式,这时候就需要使用外部kernel的这个选项。openwrt的内核config是根据版本保存的,如config-4.19,当我们在一个版本下如果有很多和硬件平台的时候,平台config的分类保存就很重要了,这时候我们会选择使用外部kernel_config的方式。

1、使用外部kernel

使用外部内核源码的方式,我们一遍会编译一遍openwrt,然后将build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7622/linux-4.19.81/源码拷贝到,如…/extkernel/4.4.198目录下。

然后make menuconfig开启Use external kernel tree选项即可。

[*] Advanced configuration options (for developers)  ----
    (../extkernel/4.4.198) Use external kernel tree
2、使用外部kernel config

内核配置要修改是,我们会使用make kernel_menuconfig来进行配置。

2.1 原本的方式

先看下原本内核.config的生成逻辑,make kernel_menuconfig的时候,会通过kconfig.pl脚本将generic和mediatek下的config-4.19合并成一个.config给内核使用。

/home/19.07/scripts/kconfig.pl  + /home/19.07/target/linux/generic/config-4.19 /home/19.07/target/linux/mediatek/mt7622/config-4.19 > /home/19.07/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7622/linux-4.19.81/.config

当我们kernel_menuconfig配置完之后,退出的时候就会保存使用kconfig.pl脚本重新将配置文件保存到config-4.19文件中。

/home/19.07/scripts/kconfig.pl '>'  /home/19.07/target/linux/generic/config-4.19 /home/19.07/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7622/linux-4.19.81/.config > /home/19.07/target/linux/mediatek/mt7622/config-4.19

所以我们要做的是将上报的到处和导入过程,改成我们自己配置的kernel_config文件。

2.2 使用外部自定义kernel config的方式

config/Config-devel.in里面添加KERNEL_CONFIG的选项支持外部配置

      config EXTERNAL_KERNEL_TREE
         string "Use external kernel tree" if DEVEL
         default ""
 
+     config EXTERNAL_KERNEL_CONFIG
+         string "Use external kernel config" if DEVEL
+         default "

然后make menuconfig填入我们要用的外部配置文件路径名称

[*] Advanced configuration options (for developers)  ----
    (./userconfig/BOARD1-kernel.config) Use external kernel config

这边我们需要一份内核的.config文件,第一次一般是我们想编译一遍之后,拷贝出来重命名成我们的BOARD1-kernel.config

修改导入过程,在19.07/include/target.mk里面添加导入外部kernel config内容

 #
 # 
 # Support external kernel config
 #
 ifneq ($(call qstrip,$(CONFIG_EXTERNAL_KERNEL_CONFIG)),)
   EXT_KERNEL_CONFIG_FIRST_CHAR := $(shell path=$(CONFIG_EXTERNAL_KERNEL_CONFIG); echo $${path:0:1})
   ifeq ($(EXT_KERNEL_CONFIG_FIRST_CHAR),/)
     _EXT_KERNEL_CONFIG_PATH := $(CONFIG_EXTERNAL_KERNEL_CONFIG)
   else
     _EXT_KERNEL_CONFIG_PATH := $(TOPDIR)/$(CONFIG_EXTERNAL_KERNEL_CONFIG)
   endif
   LINUX_CONF_CMD := cat $(_EXT_KERNEL_CONFIG_PATH)
   LINUX_RECONF_CMD := $(LINUX_CONF_CMD)
 else
   LINUX_CONF_CMD = $(call __linux_confcmd,$(LINUX_KCONFIG_LIST),)
   LINUX_RECONF_CMD = $(call __linux_confcmd,$(LINUX_RECONFIG_LIST),)
   LINUX_RECONF_DIFF = $(call __linux_confcmd,$(filter-out $(LINUX_RECONFIG_TARGET),$(LINUX_RECONFIG_LIST)),'>')
 endif

修改保存过程,19.07/include/kernel-build.mk里面添加保存外部kernel config内容

 ifneq ($(strip $(CONFIG_EXTERNAL_KERNEL_CONFIG)),"")
 	cp -a $(LINUX_DIR)/.config $(_EXT_KERNEL_CONFIG_PATH)
 else
 	$(LINUX_RECONF_DIFF) $(LINUX_DIR)/.config > $(LINUX_RECONFIG_TARGET)
 endif

之后,再次make kernel_menuconfig就可以看到,导入过程如下:

cat /home/19.07/"./zhconfig/BOARD1-kernel.config" > /home/19.07/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7622/linux-4.19.81/.config

保存过程如下:

cp -a /home/19.07/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7622/linux-4.19.81/.config /home/19.07/"./zhconfig/BOARD1-kernel.config"
cmake_minimum_required(VERSION 3.20) project(OPEN_SOURCE_OPENWRT) include(${CONFIG_CMAKE_DIR}/toolchains/${CONFIG_TOOLCHAIN_LINUX_APP}.cmake) set(CONFIG_OPENSRC_LINUX_VERSION 5.10) set(CONFIG_PRIVATE_C_LIB_DIR ${CONFIG_PUBLIC_COMPILE_FLAGS_CPU} ${CONFIG_PUBLIC_COMPILE_FLAGS_FLOAT_ABI} ${CONFIG_PUBLIC_COMPILE_FLAGS_FPU} ) set(CONFIG_RUNTIME_LIB_DIR ${CONFIG_RUNTIME_LIB_CPU} ${CONFIG_RUNTIME_LIB_FLOAT_ABI} ${CONFIG_RUNTIME_LIB_FPU} ) if(CONFIG_RUNTIME_LIB_DIR) set(CONFIG_PRIVATE_C_LIB_DIR ${CONFIG_RUNTIME_LIB_DIR}) endif() string(REPLACE ";" "_" CONFIG_PRIVATE_C_LIB_DIR "${CONFIG_PRIVATE_C_LIB_DIR}") set(HI_VERSION_DIR ${CMAKE_CURRENT_BINARY_DIR}/openwrt) set(LIST_LINK_SOURCES config dl feeds include package toolchain tools Makefile rules.mk Config.in feeds.conf.default ) add_custom_target(prebuild_openwrt DEPENDS prebuild_${CONFIG_TOOLCHAIN_NAME} COMMAND ${CMAKE_COMMAND} -E rm -rf ${HI_VERSION_DIR} COMMAND ${CMAKE_COMMAND} -E make_directory ${HI_VERSION_DIR} ) if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/openwrt_patch) foreach(each ${LIST_LINK_SOURCES}) add_custom_command(TARGET prebuild_openwrt COMMAND ${CMAKE_COMMAND} -E create_symlink ${CMAKE_CURRENT_SOURCE_DIR}/${each} ${each} COMMENT "create_symlink ${CMAKE_CURRENT_SOURCE_DIR}/${each} ${each}" WORKING_DIRECTORY ${HI_VERSION_DIR} ) endforeach() add_custom_command(TARGET prebuild_openwrt COMMAND cp -rf ${CMAKE_CURRENT_SOURCE_DIR}/target ./target COMMAND [ -d ${CMAKE_CURRENT_SOURCE_DIR}/staging_dir ] && cp -rf ${CMAKE_CURRENT_SOURCE_DIR}/staging_dir ./staging_dir || true COMMAND [ -d ${CMAKE_CURRENT_SOURCE_DIR}/build_dir ] && cp -rf ${CMAKE_CURRENT_SOURCE_DIR}/build_dir ./build_dir || true COMMAND cp -rf ${CMAKE_CURRENT_SOURCE_DIR}/scripts ./scripts COMMENT "copy generate file directory" WORKING_DIRECTORY ${HI_VERSION_DIR} ) else() if (EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/openwrt-22.03.6.tar.gz) add_custom_command(TARGET prebuild_openwrt COMMAND mkdir -p ${HI_VERSION_DIR}/openwrt_patch COMMAND cp -rf ${CMAKE_CURRENT_SOURCE_DIR}/* ${HI_VERSION_DIR}/openwrt_patch/ COMMAND cd ${HI_VERSION_DIR}/openwrt_patch && ./apply_patch.sh COMMENT "apply openwrt patch" WORKING_DIRECTORY ${HI_VERSION_DIR} ) else() add_custom_command(TARGET prebuild_openwrt COMMAND [ ! -d ${CMAKE_CURRENT_SOURCE_DIR}/dl ] && mkdir ${CMAKE_CURRENT_SOURCE_DIR}/dl || true COMMAND ${CMAKE_COMMAND} -E create_symlink ${CMAKE_CURRENT_SOURCE_DIR}/dl ${HI_VERSION_DIR}/dl COMMAND ls ${CMAKE_CURRENT_SOURCE_DIR}/ | grep -vE "^dl$" | xargs -i cp -rf ${CMAKE_CURRENT_SOURCE_DIR}/{} ${HI_VERSION_DIR} COMMAND cd ${HI_VERSION_DIR} && ./apply_patch.sh COMMENT "apply openwrt patch" WORKING_DIRECTORY ${HI_VERSION_DIR} ) endif() endif() if("ON" IN_LIST CONFIG_KASAN) add_custom_command(TARGET prebuild_openwrt COMMAND cp -f patches-${CONFIG_OPENSRC_LINUX_VERSION}/kasan/*.patch patches-${CONFIG_OPENSRC_LINUX_VERSION}/ COMMAND cat patches-${CONFIG_OPENSRC_LINUX_VERSION}/kasan/defconfig >> ${CONFIG_CHIP_NAME}/${CONFIG_CHIP_NAME}_${CONFIG_PRODUCT_NAME}_config-${CONFIG_OPENSRC_LINUX_VERSION} WORKING_DIRECTORY ${HI_VERSION_DIR}/target/linux/hisilicon ) endif() add_custom_command(TARGET prebuild_openwrt COMMAND cp -f target/linux/hisilicon/${CONFIG_CHIP_NAME}/${CONFIG_CHIP_NAME}_${CONFIG_PRODUCT_NAME}_config-5.10 target/linux/hisilicon/${CONFIG_CHIP_NAME}/config-5.10 COMMAND [ ${CONFIG_CHIP_NAME} = luofu ] && [ ${CONFIG_PRODUCT_NAME} = wrt_ax3000_lite ] && rm -f target/linux/hisilicon/base-files/etc/init.d/nft2ipset || true COMMAND cp -f target/linux/hisilicon/defconfig/openwrt_hsan_${CONFIG_CHIP_NAME}_${CONFIG_PRODUCT_NAME}_defconfig .config COMMAND echo 'CONFIG_TOOLCHAIN_ROOT=\"${CONFIG_TOOLCHAIN_ROOT}\"' >> .config && echo 'CONFIG_LIBC_ROOT_DIR=\"${CONFIG_CROSS_COMPILE_LIB_DIR}/${CONFIG_PRIVATE_C_LIB_DIR}\"' >> .config && echo 'CONFIG_LIBGCC_ROOT_DIR=\"${CONFIG_CROSS_COMPILE_LIB_DIR}/${CONFIG_PRIVATE_C_LIB_DIR}\"' >> .config && echo 'CONFIG_LIBSTDCPP_ROOT_DIR=\"${CONFIG_CROSS_COMPILE_LIB_DIR}/${CONFIG_PRIVATE_C_LIB_DIR}\"' >> .config && echo 'CONFIG_LIBPTHREAD_ROOT_DIR=\"${CONFIG_CROSS_COMPILE_LIB_DIR}/${CONFIG_PRIVATE_C_LIB_DIR}\"' >> .config && echo 'CONFIG_LIBRT_ROOT_DIR=\"${CONFIG_CROSS_COMPILE_LIB_DIR}/${CONFIG_PRIVATE_C_LIB_DIR}\"' >> .config && echo 'CONFIG_LIBATOMIC_ROOT_DIR=\"${CONFIG_CROSS_COMPILE_LIB_DIR}/${CONFIG_PRIVATE_C_LIB_DIR}\"' >> .config && echo 'CONFIG_TOOLCHAIN_PREFIX=\"${CONFIG_TOOLCHAIN_PREFIX}\"' >> .config && echo 'CONFIG_TARGET_NAME=\"${CONFIG_TOOLCHAIN_NAME}\"' >> .config COMMAND $(MAKE) defconfig COMMAND echo 'CONFIG_BUILD_TYPE=\"${CMAKE_BUILD_TYPE}\"' >> .config COMMAND echo 'CONFIG_PRODUCT_IDENTIFIER=\"${CONFIG_PRODUCT_NAME}\"' >> .config COMMENT "make (openwrt) defconfig ..." WORKING_DIRECTORY ${HI_VERSION_DIR} ) if(NOT EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/staging_dir/host/.prepared) add_custom_command(TARGET prebuild_openwrt COMMAND $(MAKE) tools/compile V=s $<$<BOOL:${CMAKE_VERBOSE_MAKEFILE}>:"V=s"> COMMENT "make (openwrt) tools/compile ..." WORKING_DIRECTORY ${HI_VERSION_DIR} ) endif() add_custom_command(TARGET prebuild_openwrt COMMAND $(MAKE) target/linux/compile V=s $<$<BOOL:${CMAKE_VERBOSE_MAKEFILE}>:"V=s"> CONFIG_LINUX_TEXT_OFFSET=${CONFIG_LINUX_TEXT_OFFSET} COMMENT "make (openwrt) target/linux/compile ..." WORKING_DIRECTORY ${HI_VERSION_DIR} ) add_custom_target(build_linux_module ) add_custom_target(build_linux_image COMMAND $(MAKE) target/linux/install V=s $<$<BOOL:${CMAKE_VERBOSE_MAKEFILE}>:"V=s"> CONFIG_LINUX_TEXT_OFFSET=${CONFIG_LINUX_TEXT_OFFSET} CONFIG_KERNEL_INITRAMFS_SOURCE_DIR=${CONFIG_KERNEL_INITRAMFS_SOURCE_DIR}/ TARGET_ROOTFS_DIR=${CONFIG_INSTALL_DIR} HSAN_SDK_ROOTFS_DIR=${CONFIG_INSTALL_DIR}/sdk-rootfs COMMENT "make (openwrt) linux uImage ..." WORKING_DIRECTORY ${HI_VERSION_DIR} ) add_custom_target(build_openwrt DEPENDS build_linux_module COMMAND $(MAKE) V=s $<$<BOOL:${CMAKE_VERBOSE_MAKEFILE}>:"V=s"> CONFIG_LINUX_TEXT_OFFSET=${CONFIG_LINUX_TEXT_OFFSET} CONFIG_KERNEL_INITRAMFS_SOURCE_DIR=${CONFIG_KERNEL_INITRAMFS_SOURCE_DIR} TARGET_ROOTFS_DIR=${CONFIG_INSTALL_DIR} COMMENT "build openwrt ..." WORKING_DIRECTORY ${HI_VERSION_DIR} ) if(CONFIG_CHIP_NAME STREQUAL "luofu" AND CONFIG_PRODUCT_NAME STREQUAL "wrt_ax3000_lite") add_custom_command(TARGET build_openwrt COMMAND rm -f ${CONFIG_INSTALL_DIR}/rootfs.wrt/etc/rc.d/S19mwan3 COMMAND rm -f ${CONFIG_INSTALL_DIR}/rootfs.wrt/etc/rc.d/S19dropbear COMMENT "disable unnecessary startup services ..." WORKING_DIRECTORY ${HI_VERSION_DIR} ) endif() add_custom_command(TARGET build_openwrt COMMAND rm -f ${CONFIG_INSTALL_DIR}/rootfs.wrt/etc/rc.d/S95telnet COMMENT "default disable telnet" WORKING_DIRECTORY ${HI_VERSION_DIR} ) add_custom_command(TARGET build_openwrt COMMAND rm -f ${CONFIG_INSTALL_DIR}/rootfs.wrt/etc/rc.d/S97hsan_easymesh COMMENT "default disable hsan_easymesh" WORKING_DIRECTORY ${HI_VERSION_DIR} ) add_custom_target(wrt COMMAND echo "$(MAKE) $(WRT_TARGET) V=s" COMMAND $(MAKE) $(WRT_TARGET) V=s CONFIG_LINUX_TEXT_OFFSET=${CONFIG_LINUX_TEXT_OFFSET} CONFIG_KERNEL_INITRAMFS_SOURCE_DIR=${CONFIG_KERNEL_INITRAMFS_SOURCE_DIR} TARGET_ROOTFS_DIR=${CONFIG_INSTALL_DIR} WORKING_DIRECTORY ${HI_VERSION_DIR} ) if(TARGET build_dts) add_dependencies(build_dts build_linux_module) endif() if(TARGET build_dts_overlay) add_dependencies(build_dts_overlay build_linux_module) endif() add_dependencies(prebuild_open_source prebuild_openwrt) add_dependencies(build_open_source build_openwrt) #依赖库配置 add_library(openwrt_lib INTERFACE) set(LIST_LINK_LIBS ubus ubox uci ssl crypto ) if(CONFIG_GATEWAY_MML_OMCI STREQUAL ON) list(APPEND LIST_LINK_LIBS sqlite3) endif() if(CONFIG_GATEWAY_SERVICE_VOICE STREQUAL ON) list(APPEND LIST_LINK_LIBS xml2 pjsip pjsip-simple pjsip-ua pj pjnath pjlib-util pjsdp ) endif() set(LIST_OPENWRT_LIBS) foreach(each ${LIST_LINK_LIBS}) target_link_libraries(openwrt_lib INTERFACE ${OPEN_SOURCE_OPENWRT_BINARY_DIR}/openwrt/staging_dir/target-${CONFIG_TOOLCHAIN_NAME}_musl/usr/lib/lib${each}.so ) if(NOT EXISTS ${OPEN_SOURCE_OPENWRT_BINARY_DIR}/openwrt/staging_dir/target-${CONFIG_TOOLCHAIN_NAME}_musl/usr/lib/lib${each}.so) list(APPEND LIST_OPENWRT_LIBS ${each}) endif() endforeach() target_include_directories(openwrt_lib INTERFACE ${OPEN_SOURCE_OPENWRT_BINARY_DIR}/openwrt/staging_dir/target-${CONFIG_TOOLCHAIN_NAME}_musl/usr/include ${OPEN_SOURCE_OPENWRT_BINARY_DIR}/openwrt/staging_dir/target-${CONFIG_TOOLCHAIN_NAME}_musl/usr/include/libubox ${OPEN_SOURCE_OPENWRT_BINARY_DIR}/openwrt/staging_dir/target-${CONFIG_TOOLCHAIN_NAME}_musl/usr/include/libxml2 ) if(LIST_OPENWRT_LIBS) add_dependencies(openwrt_lib build_openwrt) endif() 注释以上代码,切记一定要每一句都必须有注释,不可以遗漏,并且要将代码注释一起给出来
最新发布
07-19
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