atzsc
—
A2091 low level SCSI interface
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.
The atzsc
interface supports the following Zorro II
expansion cards:
- A2091
- Commodore SCSI adapter, manufacturer 514, product 2 or
product 3
- 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.
The atzsc
interface first appeared in
NetBSD 1.0