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AM335x DCAN驱动 Cannot find device "can0"

按照AM335X DCAN Driver Guide.pdf里面介绍的方法,将CAN驱动编译到内核中去,

在评估板上运行后,显示找不到can设备

root@am335x-evm:/# canconfig can0 start
Cannot find device "can0"
can0: failed to start

在/dev和/proc/devices下都没有查看到can的设备符,

是需要在哪个文件进行修改嘛??