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 Copyright (c) 1994 Christian E. Hopps
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 $NetBSD: gtsc.4,v 1.9 2009/03/09 19:24:29 joerg Exp $

.Dd August 31, 1994
.Dt GTSC 4 amiga
.Os
.Sh NAME
.Nm gtsc
.Nd GVP low level SCSI interface
.Sh SYNOPSIS
.Cd "gtsc0 at gvpbus0"
.Sh DESCRIPTION
The
.Tn 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
.Xr scsibus 4 )
This common interface interacts with a machine dependent interface,
such as
.Nm gtsc ,
which then handles the hardware specific issues.

p
The
.Nm
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
.Nm
uses is based on the WD33c93 SCSI chip.
.Sh DIAGNOSTICS
l -diag t 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

a amiga/dev/sbic.c
at which the SCSI chip timed-out. Asr and csr are status registers
within the SCSI chip.
t gtsc%d: abort %s: csr = 0x%02x, asr = 0x%02x A SCSI operation %s was aborted due to an error.
t gtsc%d: csr == 0x%02i A error has occurred within the SCSI chip code.
t gtsc%d: unexpected phase %d in icmd from %d The target described by
.Sq from %d
has taken the SCSI bus into a phase which is not
expected during polled IO.
t gtsc%d: unexpected phase %d in icmd from %d The target described by
.Sq from %d
has taken the SCSI bus into a phase which is not
expected during DMA IO setup.
.El
.Sh SEE ALSO
.Xr scsibus 4
.Sh HISTORY
The
.Nm
interface first appeared in
.Nx 1.0