source Specifies the location of the windows system root.
/l Specifies an optional locale parameter to use when
initializing the BCD store. The default is US English.
/s Specifies an optional volume letter parameter to designate
the target system partition where boot environment files are
copied. The default is the system partition identified by
the firmware.
/v Enables verbose mode.
/m If an OS loader GUID is provided, this option merges the
given loader object with the system template to produce a
bootable entry. Otherwise, only global objects are merged.