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
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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
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CHK include/linux/version.h
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CHK include/generated/utsrelease.h
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make[1]: `include/generated/mach-types.h' is up to date.
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CALL scripts/checksyscalls.sh
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CHK include/generated/compile.h
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LD drivers/cell/OptionGobiNet/built-in.o
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CC [M] drivers/cell/OptionGobiNet/GobiUSBNet.o
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CC [M] drivers/cell/OptionGobiNet/QMIDevice.o
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CC [M] drivers/cell/OptionGobiNet/QMI.o
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LD [M] drivers/cell/OptionGobiNet/GobiNet.o
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Kernel: arch/arm/boot/Image is ready
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SHIPPED arch/arm/boot/compressed/lib1funcs.S
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AS arch/arm/boot/compressed/lib1funcs.o
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LD arch/arm/boot/compressed/vmlinux
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OBJCOPY arch/arm/boot/zImage
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Kernel: arch/arm/boot/zImage is ready
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Building modules, stage 2.
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MODPOST 5 modules
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ERROR: "usbnet_suspend" [drivers/cell/OptionGobiNet/GobiNet.ko] undefined!
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ERROR: "usbnet_resume" [drivers/cell/OptionGobiNet/GobiNet.ko] undefined!
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ERROR: "usbnet_disconnect" [drivers/cell/OptionGobiNet/GobiNet.ko] undefined!
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ERROR: "usbnet_probe" [drivers/cell/OptionGobiNet/GobiNet.ko] undefined!
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make[1]: *** [__modpost] Error 1
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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。
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