A scsi_address structure defines the addressing
components for a SCSI target device. The address of the target device is separated into two components: target number and logical unit number. The two addressing components are used to uniquely identify any type of SCSI device; however, most devices can be addressed
with the target component of the address.
In the case where only the target component is used to address the device, the logical unit should be set to 0. If the SCSI target device supports logical units, then the HBA must interpret the logical units field of the data structure.
The pkt_address member of a scsi_pkt(9S) is initialized by scsi_init_pkt(9F).
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