OpenWrt 自行编译的内核扩展安装失败的解决方法

现象

拉取 OpenWrt 源码编译出来的内核扩展 ipk 拿到装有官方版本 OpenWrt 的路由器上无法安装，出现以下提示：

* satisfy_dependencies_for: Cannot satisfy the following dependencies for kmod-xxx:
* 	kernel (= 4.14.241-1-68143adfcb7fc62a239c4be112fe40de)
* opkg_install_cmd: Cannot install package kmod-xxx.

解决方案

修改 kernel vermagic 从计算配置文件的 md5 hash 改为固定值。

• OpenWrt 源码根目录添加文件 vermagic

  echo 68143adfcb7fc62a239c4be112fe40de ./vermagic

• 修改 kernel-defaults.mk

  diff --git a/include/kernel-defaults.mk b/include/kernel-defaults.mk
  index cc1e2361be..35ffc1fbba 100644
  --- a/include/kernel-defaults.mk
  +++ b/include/kernel-defaults.mk
  @@ -105,7 +105,7 @@ define Kernel/Configure/Default
                  cp $(LINUX_DIR)/.config.set $(LINUX_DIR)/.config.prev; \
          }
          $(_SINGLE) [ -d $(LINUX_DIR)/user_headers ] || $(KERNEL_MAKE) INSTALL_HDR_PATH=$(LINUX_DIR)/user_headers headers_install
  -       grep '=[ym]' $(LINUX_DIR)/.config.set | LC_ALL=C sort | mkhash md5 > $(LINUX_DIR)/.vermagic
  +       cp $(TOPDIR)/vermagic $(LINUX_DIR)/.vermagic
   endef

• 修改 package/kernel/linux/Makefile

  diff --git a/package/kernel/linux/Makefile b/package/kernel/linux/Makefile
  index 39b9e82c27..6ff64b2939 100644
  --- a/package/kernel/linux/Makefile
  +++ b/package/kernel/linux/Makefile
  @@ -24,7 +24,7 @@ export SHELL:=/bin/sh
   include $(INCLUDE_DIR)/package.mk
   
   ifeq ($(DUMP),)
  -  STAMP_BUILT:=$(STAMP_BUILT)_$(shell $(SCRIPT_DIR)/kconfig.pl $(LINUX_DIR)/.config | mkhash md5)
  +  STAMP_BUILT:=$(STAMP_BUILT)_$(shell cat $(LINUX_DIR)/.vermagic)
     -include $(LINUX_DIR)/.config
   endif

重新编译

$ make clean # 注意清除缓存
$ make -j1 V=s