Driver for SiS 900/7016 Ethernet; from FreeBSD.

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+.\"	$OpenBSD: sis.4,v 1.1 1999/12/04 20:27:38 aaron Exp $
+.\" Copyright (c) 1997, 1998, 1999
+.\"	Bill Paul <wpaul@ee.columbia.edu>. All rights reserved.
+.\"
+.\" 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.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by Bill Paul.
+.\" 4. Neither the name of the author nor the names of any co-contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"   without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``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 Bill Paul OR THE VOICES IN HIS HEAD
+.\" 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.
+.\"
+.\" $FreeBSD: src/share/man/man4/sis.4,v 1.2 1999/11/15 23:14:27 phantom Exp $
+.\"
+.Dd September 4, 1999
+.Dt SIS 4
+.Os
+.Sh NAME
+.Nm sis
+.Nd
+Silicon Integrated Systems fast ethernet device driver
+.Sh SYNOPSIS
+.Cd "controller miibus0"
+.Cd "device sis0"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for PCI ethernet adapters and embedded
+controllers based on the Silicon Integrated Systems SiS 900
+and SiS 7016 fast ethernet controller chips.
+.Pp
+The SiS 900 is a 100Mbps ethernet MAC and MII-compliant transceiver
+in a single package. It uses a bus master DMA and a scatter/gather
+descriptor scheme. The SiS 7016 is similar to the SiS 900 except
+that it has no internal PHY, requiring instead an external transceiver
+to be attached to its MII interface.
+The SiS 900 and SiS 7016 both have a 128-bit multicast hash filter
+and a single perfect filter entry for the station address.
+.Pp
+The
+.Nm
+driver supports the following media types:
+.Pp
+.Bl -tag -width xxxxxxxxxxxxxxxxxxxx
+.It autoselect
+Enable autoselection of the media type and options.
+The user can manually override
+the autoselected mode by adding media options to the
+.Pa /etc/rc.conf
+fine.
+.It 10baseT/UTP
+Set 10Mbps operation. The
+.Ar mediaopt
+option can also be used to select either
+.Ar full-duplex
+or
+.Ar half-duplex modes.
+.It 100baseTX
+Set 100Mbps (fast ethernet) operation. The
+.Ar mediaopt
+option can also be used to select either
+.Ar full-duplex
+or
+.Ar half-duplex
+modes.
+.El
+.Pp
+The
+.Nm
+driver supports the following media options:
+.Pp
+.Bl -tag -width xxxxxxxxxxxxxxxxxxxx
+.It full-duplex
+Force full duplex operation
+.It half-duplex
+Force half duplex operation.
+.El
+.Pp
+For more information on configuring this device, see
+.Xr ifconfig 8 .
+.Sh DIAGNOSTICS
+.Bl -diag
+.It "sis%d: couldn't map ports/memory"
+A fatal initialization error has occurred.
+.It "sis%d: couldn't map interrupt"
+A fatal initialization error has occurred.
+.It "sis%d: watchdog timeout"
+The device has stopped responding to the network, or there is a problem with
+the network connection (cable).
+.It "sis%d: no memory for rx list"
+The driver failed to allocate an mbuf for the receiver ring.
+.It "sis%d: no memory for tx list"
+The driver failed to allocate an mbuf for the transmitter ring when
+allocating a pad buffer or collapsing an mbuf chain into a clusisr.
+.It "sis%d: chip is in D3 power state -- setting to D0"
+This message applies only to adapters which support power
+management. Some operating sysisms place the controller in low power
+mode when shutting down, and some PCI BIOSes fail to bring the chip
+out of this state before configuring it. The controller loses all of
+its PCI configuration in the D3 state, so if the BIOS does not set
+it back to full power mode in time, it won't be able to configure it
+correctly. The driver tries to detect this condition and bring
+the adapter back to the D0 (full power) state, but this may not be
+enough to return the driver to a fully operational condition. If
+you see this message at boot time and the driver fails to attach
+the device as a network interface, you will have to perform second
+warm boot to have the device properly configured.
+.Pp
+Note that this condition only occurs when warm booting from another
+operating sysism. If you power down your sysism prior to booting
+.Ox ,
+the card should be configured correctly.
+.El
+.Sh SEE ALSO
+.Xr arp 4 ,
+.Xr netintro 4 , 
+.Xr ifconfig 8
+.Rs
+.%T SiS 900 and SiS 7016 datasheets
+.%O http://www.sis.com.tw
+.Re
+.Sh HISTORY
+The
+.Nm
+device driver first appeared in
+.Ox 2.7 .
+.Sh AUTHORS
+The
+.Nm
+driver was written by
+.An Bill Paul Aq wpaul@ee.columbia.edu .