wdsc
—
Western Digital WD33c93 SCSI Bus Interface Controller
The wdsc
driver provides an abstraction layer between
the SCSI hardware found in multitudinous SGI machines (including Personal Iris
series, Indigo, Indy, Challenge S, Indigo2, and Challenge M) 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.
Wayne Knowles ported the sgimips incarnation of the wdsc
driver from the amiga and atari ports. It first appeared in
NetBSD 1.6.