NetBSD/share/man/man4/dpt.4

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.\" $NetBSD: dpt.4,v 1.13 2000/07/31 11:45:48 ad Exp $
.\"
.\" Copyright (c) 1999, 2000 Andy Doran <ad@NetBSD.org>
.\" All rights reserved.
.\"
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.Dd September 28, 1999
.Dt DPT 4
.Os
.Sh NAME
.Nm dpt
.Nd
DPT EATA
.Tn SCSI
adapter driver
.Sh SYNOPSIS
.Cd "dpt* at isa? port ? irq ? dma ?"
.Cd "dpt* at eisa? slot ?"
.Cd "dpt* at pci? dev ? function ?"
.Cd "scsibus* at dpt?"
.Sh DESCRIPTION
The
.Nm
driver provides support for third and fourth generation DPT
.Tn SCSI
controllers. All communication with the controllers is conducted via the
EATA (Enhanced AT Bus Attachment) protocol.
.Pp
DPT adapters examine and interpret all
.Tn SCSI
commands received before passing them to any underlying physical device(s).
In this way, caching, RAID and other transformations are achieved while
remaining transparent to the host operating system.
.Sh HARDWARE
The
.Nm
driver provides support for the following
.Tn SCSI
adapters:
.Pp
.Bl -tag -width -offset indent -compact
.It Tn DPT SmartCache III
.It Tn DPT SmartCache IV
.It Tn DPT SmartRAID III
.It Tn DPT SmartRAID IV
.El
.Sh DIAGNOSTICS
None of these messages should be encountered under normal circumstances. It
should be noted that the list below is not complete.
.Pp
.Bl -tag -width indent
.It dpt%d: readcfg failed - see dpt(4)
.br
The EATA configuration data did not appear upon request. This may be caused
by older firmware. Generally the solution is to power-cycle the affected
machine.
.br
.It dpt%d: spurious intr
.br
A spurious interrupt was recieved from the HBA.
.br
.It dpt%d: bogus status (returned CCB id NNNN)
.br
A corrupt or incomplete status packet was recieved from the HBA.
.El
.Sh SEE ALSO
.Xr intro 4 ,
.Xr cd 4 ,
.Xr ch 4 ,
.Xr scsi 4 ,
.Xr sd 4 ,
.Xr st 4
.Pp
CAM committee standard CAM/89-004 - the EATA (Enhanced AT Bus Attachment)
protocol.
.Sh AUTHOR
The
.Nm
driver was written by Andy Doran
.Aq ad@netbsd.org ,
based upon the
.Nm uha
and
.Nm bha
drivers, which are the work of others.
.Sh HISTORY
The
.Nm dpt
driver first appeared in
.Nx 1.4.2 .
.Sh BUGS
EATA adapters other than listed may function correctly with the
.Nm
driver, however a definitive list is not available.
.Pp
Older firmware may prove problematic. It is recommended that the latest
available firmware be used. Contact DPT for a firmware update.
.Pp
Older boards that do not suppport scatter-gather I/O or DMA are not supported.
.Pp
The number of queued commands available on ISA devices is clamped.
.Pp
ECC formatted disk and arrays (i.e. with a sector size of 528 bytes) do not
work correctly with the PM2041 and certain firmware revisions of the PM3334.