You can load drivers into the stack from the command line.
For example:
io-pkt-v4-hc -di82544
This command-line invocation works whether or not the driver is a native driver or an io-net-style driver. The stack automatically detects the driver type and loads the devnp-shim.so binary if the driver is an io-net driver.
You can also mount a driver in the standard way:
mount -Tio-pkt /lib/dll/devnp-i82544.so
The mount command still supports the io-net option, to provide backward compatibility with existing scripts:
mount -Tio-net /lib/dll/devnp-i82544.so
The standard way to remove a driver from the stack is with the ifconfig iface destroy command. For example:
ifconfig wm0 destroy