The
wdsc driver provides an abstraction layer between the SCSI hardware fitted to the Motorola MVME147 single board computer (WD33C93), and the machine independent SCSI drivers described in
scsibus(4).
In addition to sending the required SCSI commands to target devices on the SCSI bus, the
wdsc driver deals with DMA, device interrupts, sync/async negotiation and target disconnects/reconnects.