NAME
atzsc —
A2091 low level SCSI
interface
SYNOPSIS
atzsc0 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
atzsc, which then handles the hardware specific issues.
The
atzsc 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
atzsc uses is based on the WD33c93 SCSI chip.
HARDWARE
The
atzsc interface supports the following Zorro II expansion
cards:
-
-
- A2091
- Commodore SCSI adapter, manufacturer 514,
product 2 or product 3
DIAGNOSTICS
- sbicwait TIMEO @%d with asr=x%x
csr=x%x
- The 33c93 code (sbic) has been waiting too long for a SCSI
chip operation to complete. %d is the line in the source file
amiga/dev/sbic.c at which the SCSI chip timed-out. Asr
and csr are status registers within the SCSI chip.
- atzsc%d: abort %s: csr = 0x%02x, asr =
0x%02x
- A SCSI operation %s was aborted due to an error.
- atzsc%d: csr == 0x%02i
- A error has occurred within the SCSI chip code.
- atzsc%d: unexpected phase %d in icmd
from %d
- The target described by ‘from %d’ has taken
the SCSI bus into a phase which is not expected during polled IO.
- atzsc%d: unexpected phase %d in icmd
from %d
- The target described by ‘from %d’ has taken
the SCSI bus into a phase which is not expected during DMA IO setup.
SEE ALSO
scsibus(4)
HISTORY
The
atzsc interface first appeared in
NetBSD
1.0