Setting the moddebug Kernel Variable

The moddebug kernel variable controls the module loading process. The possible values of moddebug are:

0x80000000

Prints messages to the console when loading or unloading modules.

0x40000000

Gives more detailed error messages.

0x20000000

Prints more detail when loading or unloading, such as including the address and size.

0x00001000

No auto-unloading drivers. The system does not attempt to unload the device driver when the system resources become low.

0x00000080

No auto-unloading streams. The system does not attempt to unload the STREAMS module when the system resources become low.

0x00000010

No auto-unloading of kernel modules of any type.

0x00000001

If running with kmdb, moddebug causes a breakpoint to be executed and a return to kmdb immediately before each module's _init() routine is called. This setting also generates additional debug messages when the module's _info() and _fini() routines are executed.