NAME
afsc —
A4091 low level SCSI
interface
SYNOPSIS
afsc0 at zbus0
DESCRIPTION
The Amiga architecture uses a common machine independent scsi sub-system
provided in the kernel source. The machine independent drivers that use this
code access the hardware through a common interface. (see
scsibus(4)) This common
interface interacts with a machine dependent interface, such as
afsc, which then handles the hardware specific issues.
The
afsc interface handles things such as DMA and interrupts
as well as actually sending commands, negotiating synchronous or asynchronous
transfers and handling disconnect/reconnect of SCSI targets. The hardware that
afsc uses is based on the NCR53c710 SCSI chip.
HARDWARE
The
afsc interface supports the following Zorro III expansion
cards:
-
-
- A4091
- Commodore SCSI adapter, manufacturer 514,
product 84
DIAGNOSTICS
- afsc%s: abort %s: dstat %02x, sstat0
%02x sbcl %02x
- The scsi operation %s was aborted due to error. Dstat,
sstat and sbcl are registers within the NCR53c710 SCSI chip.
- siop id %d reset
- The NCR53c710 SCSI chip has been reset and configure at id
%d.
- SIOP interrupt: %x sts %x msg %x sbcl
%x
- The NCR53c710 SCSI chip has interrupted unexpectedly.
- SIOP: SCSI Gross Error
- The NCR53c710 SCSI chip has indicated that it is
confused.
- SIOP: Parity Error
- The NCR53c710 SCSI chip has indicated that it has detected
a parity error on the SCSI bus.
SEE ALSO
scsibus(4)
HISTORY
The
afsc interface first appeared in
NetBSD
1.0