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Device driver Major number

Hi,
I have created a pseudo device usign mknod with major
number 255. Now when we use mknod we have to specify
the major number for the device. 
However I want the system to dynamically allocate the
major number, so am using "register_chrdev". As I
understand register_chrdev, just registers the char
device & not create it.

So how do I create the device so that the major number
is allocated dynamically ?

Thanks,
SP

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