您好，
我通过下面的方法来配置can:
canconfig can0 bitrate 50000 ctrlmode loopback on
会打印如下错误信息：
opening CAN interface 'can0' in sysfs failed, maybe not a CAN interface
No such file or directory
请问这是什么原因导致的，我需要做哪些修改？？谢谢！
备注:我采用的内核版本为linux-3.12.10-ti2013.12.01.tar.gz。
另外，执行ifconfig -a，如有如下信息打印：
can0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
NOARP MTU:16 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:10
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:68
eth0 Link encap:Ethernet HWaddr 02:A8:90:48:59:5D
inet addr:192.168.5.200 Bcast:192.168.5.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1500 errors:0 dropped:0 overruns:0 frame:0
TX packets:649 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1836798 (1.7 MiB) TX bytes:103338 (100.9 KiB)
Interrupt:56
eth1 Link encap:Ethernet HWaddr BE:5E:EF:18:0F:88
inet addr:192.168.2.1 Bcast:192.168.2.255 Mask:255.255.255.0
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
