device driver debugging

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hi all
normally when i inmod my module -- if some error is there it appears on console and i guess the source of error.
 
but this time what i have found is ..all error messages  -- just scroll up and what i see is last screen
from which i am unable to make any guess where i am making mistake...
 
and i had to reboot and after that there is nothing left of that error in dmesg
 
Is there any way i can store these messages ---o/p of dmesg -- just after insmod in some file --
i tried that too by simple dmesg > tt
but nothing works
pl tell me what to do
--
Thanks & Regards
Nidhi

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