20.3.2 Driver Binding Protocol Start() and Stop()

The Start() service of the Driver Binding Protocol for a SCSI device driver or host controller driver opens the SCSI I/O Protocol with an attribute of EFI_OPEN_PROTOCOL_BY_DRIVER. The service then installs the I/O abstraction protocol for the SCSI device onto the handle on which the EFI_SCSI_IO_PROTOCOL is installed.