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+.\"	$NetBSD: geodeide.4,v 1.5 2009/10/19 18:41:08 bouyer Exp $
+.\"
+.\" Copyright (c) 2004 Manuel Bouyer.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd July 5, 2005
+.Dt GEODEIDE 4
+.Os
+.Sh NAME
+.Nm geodeide
+.Nd AMD Geode IDE disk controllers driver
+.Sh SYNOPSIS
+.Cd "geodeide* at pci? dev ? function ? flags 0x0000"
+.Sh DESCRIPTION
+The
+.Nm
+driver supports the
+.Tn AMD
+Geode CS5530A and SC1100
+.Tn IDE
+controllers,
+and provides the interface with the hardware for the
+.Xr ata 4
+driver.
+.Pp
+The 0x0002 flag forces the
+.Nm
+driver to disable
+.Tn DMA
+on chipsets for which
+.Tn DMA
+would normally be enabled.
+This can be used as a debugging aid, or to work around
+problems where the
+.Tn IDE
+controller is wired up to the system incorrectly.
+.Sh SEE ALSO
+.Xr ata 4 ,
+.Xr atapi 4 ,
+.Xr intro 4 ,
+.Xr pci 4 ,
+.Xr pciide 4 ,
+.Xr wd 4 ,
+.Xr wdc 4
+.Sh BUGS
+The SC1100 controller requires 4-byte aligned data transfers and
+cannot handle transfers of exactly 64 kilobytes.
+.Pp
+The CS5530 multifunction chip/core's
+.Tn IDE
+section claims to be capable of
+.Tn UDMA
+mode 2
+.Pq 33.3MB/s
+but in practice using that mode swamps the controller so badly that
+.Nm
+limits the
+.Tn UDMA
+negotiation to mode 1
+.Pq 25MB/s
+so that the other functions of this chip continue to work.
+.Pp
+The
+.Tn IDE DMA
+engine in the CS5530 can only do transfers on cache-line
+.Pq 16-byte
+boundaries.
+Attempts to perform
+.Tn DMA
+on any other alignment will crash the system.
+This problem may also exist in the SC1100 since the CS5530 was its
+direct predecessor, and it is not clear that National Semiconductor
+fixed any bugs in it.
+.Pp
+The
+.Nm
+driver will reject attempts to
+.Tn DMA
+to buffers not aligned to the required boundary.
+The
+.Xr wd 4
+disk driver will back off to
+.Tn PIO
+mode to accomplish these transfer requests, at reduced system performance.