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Change the title slightly to indicate what GIO stands for. Also, be sure to 

mention Challenge M, state that only two electrically distinct slots exist
on Indigo2/Challenge M and inform that a SysAD bug exists, which certain
cards may trigger (though we may mask it with a workaround). Other minor
nits as well.
This commit is contained in:
rumble 2006-12-22 00:51:00 +00:00
parent aede3e59fc
commit c1f813ee0d
1 changed files with 22 additions and 8 deletions
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30
share/man/man4/man4.sgimips/gio.4
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@ -1,4 +1,4 @@
.\" $NetBSD: gio.4,v 1.13 2006/11/24 19:46:58 christos Exp $
.\" $NetBSD: gio.4,v 1.14 2006/12/22 00:51:00 rumble Exp $
.\"
.\" Copyright (c) 2002 The NetBSD Foundation, Inc.
.\" All rights reserved.
@ -34,12 +34,12 @@
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd July 20, 2006
.Dd December 21, 2006
.Dt GIO 4 sgimips
.Os
.Sh NAME
.Nm gio
.Nd SGI's early PCI-like bus
.Nd SGI's Graphics I/O (GIO) bus - an early PCI-like bus
.Sh SYNOPSIS
.Cd "gio0 at imc0"
.Cd "gio0 at pic0"
@ -57,8 +57,9 @@ peripheral controller, and memory and CPU are accessed through the
(Processor Interface Controller).
The
.Nm
bus is found on the Personal Iris 4D/3x, Indigo, Indy, Challenge-S, and
Indigo2 machines and exists in three incarnations: GIO32, GIO32-bis, and GIO64.
bus is found on the Personal Iris 4D/3x, Indigo, Indy, Challenge S, Challenge M
and Indigo2 machines and exists in three incarnations: GIO32, GIO32-bis, and
GIO64.
.Sh SEE ALSO
.Xr grtwo 4 ,
.Xr hpc 4 ,
@ -71,7 +72,7 @@ The
driver first appeared in
.Nx 1.5 .
.Sh CAVEATS
On Challenge-S systems only one
On Challenge S systems only one
.Nm
expansion slot may be used with a DMA-capable device.
This is due to the fact that the IOPLUS board uses one of the slots'
@ -81,7 +82,20 @@ Ethernet.
Which slot to use with a DMA-capable card depends on the card in
question.
HPC1.5-based cards, such as the E++ Ethernet Adapter and GIO32 SCSI
Adapter, must be placed in slot #1 (next to the memory banks).
All other DMA-capable boards must be placed in slot #0 (closest to
Adapter, must be placed in slot 1 (next to the memory banks).
All other DMA-capable boards must be placed in slot 0 (closest to
the edge of the case).
In either case the other slot may only accommodate a PIO card.
.Pp
Indigo2 and Challenge M systems contain either three or four GIO64 connectors,
depending on the model. However, in both cases only two electrically
distinct slots are present. Therefore, distinct expansion cards may not
share physical connectors associated with the same slot. Refer to the PCB
stencils to determine the association between physical connectors and slots.
.Sh BUGS
Systems employing the
.Xr imc 4
may experience spurious SysAD bus parity errors when using expansion cards,
which do not drive all data lines during a CPU PIO read.
The only workaround is to disable SysAD parity checking when using such
cards.