标签: linux 查看 符号表
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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- obj-m := GobiNet.o
- GobiNet-objs := GobiUSBNet.o QMIDevice.o QMI.o
但是出现了如下错误:
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- /home/sylvain/Projects/android_gingerbread_realv210_ver_1_0/kernel
- CHK include/linux/version.h
- CHK include/generated/utsrelease.h
- make[1]: `include/generated/mach-types.h' is up to date.
- CALL scripts/checksyscalls.sh
- CHK include/generated/compile.h
- LD drivers/cell/OptionGobiNet/built-in.o
- CC [M] drivers/cell/OptionGobiNet/GobiUSBNet.o
- CC [M] drivers/cell/OptionGobiNet/QMIDevice.o
- CC [M] drivers/cell/OptionGobiNet/QMI.o
- LD [M] drivers/cell/OptionGobiNet/GobiNet.o
- Kernel: arch/arm/boot/Image is ready
- SHIPPED arch/arm/boot/compressed/lib1funcs.S
- AS arch/arm/boot/compressed/lib1funcs.o
- LD arch/arm/boot/compressed/vmlinux
- OBJCOPY arch/arm/boot/zImage
- Kernel: arch/arm/boot/zImage is ready
- Building modules, stage 2.
- MODPOST 5 modules
- ERROR: "usbnet_suspend" [drivers/cell/OptionGobiNet/GobiNet.ko] undefined!
- ERROR: "usbnet_resume" [drivers/cell/OptionGobiNet/GobiNet.ko] undefined!
- ERROR: "usbnet_disconnect" [drivers/cell/OptionGobiNet/GobiNet.ko] undefined!
- ERROR: "usbnet_probe" [drivers/cell/OptionGobiNet/GobiNet.ko] undefined!
- make[1]: *** [__modpost] Error 1
- 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