h6. [[USBDriver]] h6(. » [[USBDriver SWI Calls|SWI Calls]] h6((. » USBDriver_DeregisterBus h2. USBDriver_DeregisterBus h5. (SWI &54A41) |_<^{width:4em}. Entry | | |<^. R0 |<^. HC bus handle | |_<^{width:4em}. Exit | | |<^. R0 |<^. Preserved | h4. Use This SWI deregisters a host controller bus previously [[USBDriver_RegisterBus|registered]].