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我往linux内核里添加一个驱动模块,根据《linux设备驱动》第三版,修改Makefile如下:




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  1. obj-m := GobiNet.o
  2. GobiNet-objs := GobiUSBNet.o QMIDevice.o QMI.o

但是出现了如下错误:




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  1. /home/sylvain/Projects/android_gingerbread_realv210_ver_1_0/kernel
  2. CHK include/linux/version.h
  3. CHK include/generated/utsrelease.h
  4. make[1]: `include/generated/mach-types.h' is up to date.
  5. CALL scripts/checksyscalls.sh
  6. CHK include/generated/compile.h
  7. LD drivers/cell/OptionGobiNet/built-in.o
  8. CC [M] drivers/cell/OptionGobiNet/GobiUSBNet.o
  9. CC [M] drivers/cell/OptionGobiNet/QMIDevice.o
  10. CC [M] drivers/cell/OptionGobiNet/QMI.o
  11. LD [M] drivers/cell/OptionGobiNet/GobiNet.o
  12. Kernel: arch/arm/boot/Image is ready
  13. SHIPPED arch/arm/boot/compressed/lib1funcs.S
  14. AS arch/arm/boot/compressed/lib1funcs.o
  15. LD arch/arm/boot/compressed/vmlinux
  16. OBJCOPY arch/arm/boot/zImage
  17. Kernel: arch/arm/boot/zImage is ready
  18. Building modules, stage 2.
  19. MODPOST 5 modules
  20. ERROR: "usbnet_suspend" [drivers/cell/OptionGobiNet/GobiNet.ko] undefined!
  21. ERROR: "usbnet_resume" [drivers/cell/OptionGobiNet/GobiNet.ko] undefined!
  22. ERROR: "usbnet_disconnect" [drivers/cell/OptionGobiNet/GobiNet.ko] undefined!
  23. ERROR: "usbnet_probe" [drivers/cell/OptionGobiNet/GobiNet.ko] undefined!
  24. make[1]: *** [__modpost] Error 1
  25. make: *** [modules] Error 2

编译过程中生成了"GobiNet.mod.c"和"GobiNet.o",但是并没有生成GobiNet.ko文件。

经历一番折腾之后,我发现问题的原因了。

我误解了错误信息,没有清楚ko生成过程。编译模块在链接过程中查找外部符号表,但并没有找到,因为该外部符号表并没有编译。

根据以上分析,我查看了外部符号在drivers/net/usb/usbnet.c文件,这就需要配置.config文件中设置CONFIG_USBNET=y。

希望对大家有所帮助。


英文地址:http://stackoverflow.com/questions/7812418/kernel-driver-external-modules-not-building-completely