WDSC(4) | Device Drivers Manual (mvme68k) | WDSC(4) |
wdsc
—
wdsc0 at pcc? ipl 2
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.
wdsc
driver as it has proved extremely
difficult to make it work reliably in this mode.
The wdsc
driver does not respond well to
exceptional conditions caused by poor SCSI cabling and/or termination. In
those instances the machine is likely to require a hard reset to
recover.
The current wdsc
driver should be blown
away and replaced with a machine independent version.
February 17, 2017 | NetBSD 9.4 |