How to remove a module from the kernel
From Wiki-UX.info
How do I completely remove a module from a system?
You cannot completely remove a module from a system by simply removing it from the /usr/conf/mod directory. First unload the module, then uninstall the module, and finally remove the module from the /usr/conf/mod directory as follows:
1. Unload the module:
# kcmodule -s <mydrivername>=unused
2. Uninstall the module:
# kcmodule -s <mydrivername>=uninstall
3. Remove the module from the /usr/conf/mod file:
# rm -f /usr/conf/mod/<mydrivername>
Reference
http://h21007.www2.hp.com/portal/download/files/unprot/ddk/FAQ11iv3.pdf