Loading a new charecter device

Hi
I wrote a driver for a new charecter device and put the major number as
200. Then I created a new device say 'XYZ' by the following command
mknod m=rw XYZ c 200 0. I didn't specified the minor value in the program. I given the minor value as 0 when I made the device. But I think it will not make any problems. Still my driver is not working. When I try to open the device, it will return no such device. How to know whether the device driver has loaded perfectly. What is the problem. Please somebody help me. regards
Blesson Paul

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