I compiled a simple device driver according to Device Driver Tutorial, and ran 
the mdb like below:
#mdb -k
>dummy`_init::nm
Value          Size               Type   Bind   Other  Shndx Name
0xf9609c20|0x0000002a|FUNC|GLOB|0x0    |1        |dummy`_init
>dummy`_init::bp
mdb: failed to add breakpoint at 0xf9609c20: operation not supported by target

I wonder why I can not set breakpoint to it? Is there any way that can make the 
target support the ::bp?
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