DOCBOOKS := wanbook.xml z8530book.xml mcabook.xml videobook.xml \
kernel-hacking.xml kernel-locking.xml deviceiobook.xml \
procfs-guide.xml writing_usb_driver.xml \
- sis900.xml kernel-api.xml journal-api.xml lsm.xml usb.xml \
+ kernel-api.xml journal-api.xml lsm.xml usb.xml \
gadget.xml libata.xml mtdnand.xml librs.xml rapidio.xml
###
+++ /dev/null
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
- "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" []>
-
-<book id="SiS900Guide">
-
-<bookinfo>
-
-<title>SiS 900/7016 Fast Ethernet Device Driver</title>
-
-<authorgroup>
-<author>
-<firstname>Ollie</firstname>
-<surname>Lho</surname>
-</author>
-
-<author>
-<firstname>Lei Chun</firstname>
-<surname>Chang</surname>
-</author>
-</authorgroup>
-
-<edition>Document Revision: 0.3 for SiS900 driver v1.06 & v1.07</edition>
-<pubdate>November 16, 2000</pubdate>
-
-<copyright>
- <year>1999</year>
- <holder>Silicon Integrated System Corp.</holder>
-</copyright>
-
-<legalnotice>
- <para>
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
- </para>
-
- <para>
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- </para>
-
- <para>
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- </para>
-</legalnotice>
-
-<abstract>
-<para>
-This document gives some information on installation and usage of SiS 900/7016
-device driver under Linux.
-</para>
-</abstract>
-
-</bookinfo>
-
-<toc></toc>
-
-<chapter id="intro">
- <title>Introduction</title>
-
-<para>
-This document describes the revision 1.06 and 1.07 of SiS 900/7016 Fast Ethernet
-device driver under Linux. The driver is developed by Silicon Integrated
-System Corp. and distributed freely under the GNU General Public License (GPL).
-The driver can be compiled as a loadable module and used under Linux kernel
-version 2.2.x. (rev. 1.06)
-With minimal changes, the driver can also be used under 2.3.x and 2.4.x kernel
-(rev. 1.07), please see
-<xref linkend="install"/>. If you are intended to
-use the driver for earlier kernels, you are on your own.
-</para>
-
-<para>
-The driver is tested with usual TCP/IP applications including
-FTP, Telnet, Netscape etc. and is used constantly by the developers.
-</para>
-
-<para>
-Please send all comments/fixes/questions to
-<ulink url="mailto:lcchang@sis.com.tw">Lei-Chun Chang</ulink>.
-</para>
-</chapter>
-
-<chapter id="changes">
- <title>Changes</title>
-
-<para>
-Changes made in Revision 1.07
-
-<orderedlist>
-<listitem>
-<para>
-Separation of sis900.c and sis900.h in order to move most
-constant definition to sis900.h (many of those constants were
-corrected)
-</para>
-</listitem>
-
-<listitem>
-<para>
-Clean up PCI detection, the pci-scan from Donald Becker were not used,
-just simple pci_find_*.
-</para>
-</listitem>
-
-<listitem>
-<para>
-MII detection is modified to support multiple mii transceiver.
-</para>
-</listitem>
-
-<listitem>
-<para>
-Bugs in read_eeprom, mdio_* were removed.
-</para>
-</listitem>
-
-<listitem>
-<para>
-Lot of sis900 irrelevant comments were removed/changed and
-more comments were added to reflect the real situation.
-</para>
-</listitem>
-
-<listitem>
-<para>
-Clean up of physical/virtual address space mess in buffer
-descriptors.
-</para>
-</listitem>
-
-<listitem>
-<para>
-Better transmit/receive error handling.
-</para>
-</listitem>
-
-<listitem>
-<para>
-The driver now uses zero-copy single buffer management
-scheme to improve performance.
-</para>
-</listitem>
-
-<listitem>
-<para>
-Names of variables were changed to be more consistent.
-</para>
-</listitem>
-
-<listitem>
-<para>
-Clean up of auo-negotiation and timer code.
-</para>
-</listitem>
-
-<listitem>
-<para>
-Automatic detection and change of PHY on the fly.
-</para>
-</listitem>
-
-<listitem>
-<para>
-Bug in mac probing fixed.
-</para>
-</listitem>
-
-<listitem>
-<para>
-Fix 630E equalier problem by modifying the equalizer workaround rule.
-</para>
-</listitem>
-
-<listitem>
-<para>
-Support for ICS1893 10/100 Interated PHYceiver.
-</para>
-</listitem>
-
-<listitem>
-<para>
-Support for media select by ifconfig.
-</para>
-</listitem>
-
-<listitem>
-<para>
-Added kernel-doc extratable documentation.
-</para>
-</listitem>
-
-</orderedlist>
-</para>
-</chapter>
-
-<chapter id="tested">
- <title>Tested Environment</title>
-
-<para>
-This driver is developed on the following hardware
-
-<itemizedlist>
-<listitem>
-
-<para>
-Intel Celeron 500 with SiS 630 (rev 02) chipset
-</para>
-</listitem>
-<listitem>
-
-<para>
-SiS 900 (rev 01) and SiS 7016/7014 Fast Ethernet Card
-</para>
-</listitem>
-
-</itemizedlist>
-
-and tested with these software environments
-
-<itemizedlist>
-<listitem>
-
-<para>
-Red Hat Linux version 6.2
-</para>
-</listitem>
-<listitem>
-
-<para>
-Linux kernel version 2.4.0
-</para>
-</listitem>
-<listitem>
-
-<para>
-Netscape version 4.6
-</para>
-</listitem>
-<listitem>
-
-<para>
-NcFTP 3.0.0 beta 18
-</para>
-</listitem>
-<listitem>
-
-<para>
-Samba version 2.0.3
-</para>
-</listitem>
-
-</itemizedlist>
-
-</para>
-
-</chapter>
-
-<chapter id="files">
-<title>Files in This Package</title>
-
-<para>
-In the package you can find these files:
-</para>
-
-<para>
-<variablelist>
-
-<varlistentry>
-<term>sis900.c</term>
-<listitem>
-<para>
-Driver source file in C
-</para>
-</listitem>
-</varlistentry>
-
-<varlistentry>
-<term>sis900.h</term>
-<listitem>
-<para>
-Header file for sis900.c
-</para>
-</listitem>
-</varlistentry>
-
-<varlistentry>
-<term>sis900.sgml</term>
-<listitem>
-<para>
-DocBook SGML source of the document
-</para>
-</listitem>
-</varlistentry>
-
-<varlistentry>
-<term>sis900.txt</term>
-<listitem>
-<para>
-Driver document in plain text
-</para>
-</listitem>
-</varlistentry>
-
-</variablelist>
-</para>
-</chapter>
-
-<chapter id="install">
- <title>Installation</title>
-
-<para>
-Silicon Integrated System Corp. is cooperating closely with core Linux Kernel
-developers. The revisions of SiS 900 driver are distributed by the usuall channels
-for kernel tar files and patches. Those kernel tar files for official kernel and
-patches for kernel pre-release can be download at
-<ulink url="http://ftp.kernel.org/pub/linux/kernel/">official kernel ftp site</ulink>
-and its mirrors.
-The 1.06 revision can be found in kernel version later than 2.3.15 and pre-2.2.14,
-and 1.07 revision can be found in kernel version 2.4.0.
-If you have no prior experience in networking under Linux, please read
-<ulink url="http://www.tldp.org/">Ethernet HOWTO</ulink> and
-<ulink url="http://www.tldp.org/">Networking HOWTO</ulink> available from
-Linux Documentation Project (LDP).
-</para>
-
-<para>
-The driver is bundled in release later than 2.2.11 and 2.3.15 so this
-is the most easy case.
-Be sure you have the appropriate packages for compiling kernel source.
-Those packages are listed in Document/Changes in kernel source
-distribution. If you have to install the driver other than those bundled
-in kernel release, you should have your driver file
-<filename>sis900.c</filename> and <filename>sis900.h</filename>
-copied into <filename class="directory">/usr/src/linux/drivers/net/</filename> first.
-There are two alternative ways to install the driver
-</para>
-
-<sect1>
-<title>Building the driver as loadable module</title>
-
-<para>
-To build the driver as a loadable kernel module you have to reconfigure
-the kernel to activate network support by
-</para>
-
-<para><screen>
-make menuconfig
-</screen></para>
-
-<para>
-Choose <quote>Loadable module support ---></quote>,
-then select <quote>Enable loadable module support</quote>.
-</para>
-
-<para>
-Choose <quote>Network Device Support ---></quote>, select
-<quote>Ethernet (10 or 100Mbit)</quote>.
-Then select <quote>EISA, VLB, PCI and on board controllers</quote>,
-and choose <quote>SiS 900/7016 PCI Fast Ethernet Adapter support</quote>
-to <quote>M</quote>.
-</para>
-
-<para>
-After reconfiguring the kernel, you can make the driver module by
-</para>
-
-<para><screen>
-make modules
-</screen></para>
-
-<para>
-The driver should be compiled with no errors. After compiling the driver,
-the driver can be installed to proper place by
-</para>
-
-<para><screen>
-make modules_install
-</screen></para>
-
-<para>
-Load the driver into kernel by
-</para>
-
-<para><screen>
-insmod sis900
-</screen></para>
-
-<para>
-When loading the driver into memory, some information message can be view by
-</para>
-
-<para>
-<screen>
-dmesg
-</screen>
-
-or
-
-<screen>
-cat /var/log/message
-</screen>
-</para>
-
-<para>
-If the driver is loaded properly you will have messages similar to this:
-</para>
-
-<para><screen>
-sis900.c: v1.07.06 11/07/2000
-eth0: SiS 900 PCI Fast Ethernet at 0xd000, IRQ 10, 00:00:e8:83:7f:a4.
-eth0: SiS 900 Internal MII PHY transceiver found at address 1.
-eth0: Using SiS 900 Internal MII PHY as default
-</screen></para>
-
-<para>
-showing the version of the driver and the results of probing routine.
-</para>
-
-<para>
-Once the driver is loaded, network can be brought up by
-</para>
-
-<para><screen>
-/sbin/ifconfig eth0 IPADDR broadcast BROADCAST netmask NETMASK media TYPE
-</screen></para>
-
-<para>
-where IPADDR, BROADCAST, NETMASK are your IP address, broadcast address and
-netmask respectively. TYPE is used to set medium type used by the device.
-Typical values are "10baseT"(twisted-pair 10Mbps Ethernet) or "100baseT"
-(twisted-pair 100Mbps Ethernet). For more information on how to configure
-network interface, please refer to
-<ulink url="http://www.tldp.org/">Networking HOWTO</ulink>.
-</para>
-
-<para>
-The link status is also shown by kernel messages. For example, after the
-network interface is activated, you may have the message:
-</para>
-
-<para><screen>
-eth0: Media Link On 100mbps full-duplex
-</screen></para>
-
-<para>
-If you try to unplug the twist pair (TP) cable you will get
-</para>
-
-<para><screen>
-eth0: Media Link Off
-</screen></para>
-
-<para>
-indicating that the link is failed.
-</para>
-</sect1>
-
-<sect1>
-<title>Building the driver into kernel</title>
-
-<para>
-If you want to make the driver into kernel, choose <quote>Y</quote>
-rather than <quote>M</quote> on
-<quote>SiS 900/7016 PCI Fast Ethernet Adapter support</quote>
-when configuring the kernel. Build the kernel image in the usual way
-</para>
-
-<para><screen>
-make clean
-
-make bzlilo
-</screen></para>
-
-<para>
-Next time the system reboot, you have the driver in memory.
-</para>
-
-</sect1>
-</chapter>
-
-<chapter id="problems">
- <title>Known Problems and Bugs</title>
-
-<para>
-There are some known problems and bugs. If you find any other bugs please
-mail to <ulink url="mailto:lcchang@sis.com.tw">lcchang@sis.com.tw</ulink>
-
-<orderedlist>
-
-<listitem>
-<para>
-AM79C901 HomePNA PHY is not thoroughly tested, there may be some
-bugs in the <quote>on the fly</quote> change of transceiver.
-</para>
-</listitem>
-
-<listitem>
-<para>
-A bug is hidden somewhere in the receive buffer management code,
-the bug causes NULL pointer reference in the kernel. This fault is
-caught before bad things happen and reported with the message:
-
-<computeroutput>
-eth0: NULL pointer encountered in Rx ring, skipping
-</computeroutput>
-
-which can be viewed with <literal remap="tt">dmesg</literal> or
-<literal remap="tt">cat /var/log/message</literal>.
-</para>
-</listitem>
-
-<listitem>
-<para>
-The media type change from 10Mbps to 100Mbps twisted-pair ethernet
-by ifconfig causes the media link down.
-</para>
-</listitem>
-
-</orderedlist>
-</para>
-</chapter>
-
-<chapter id="RHistory">
- <title>Revision History</title>
-
-<para>
-<itemizedlist>
-
-<listitem>
-<para>
-November 13, 2000, Revision 1.07, seventh release, 630E problem fixed
-and further clean up.
-</para>
-</listitem>
-
-<listitem>
-<para>
-November 4, 1999, Revision 1.06, Second release, lots of clean up
-and optimization.
-</para>
-</listitem>
-
-<listitem>
-<para>
-August 8, 1999, Revision 1.05, Initial Public Release
-</para>
-</listitem>
-
-</itemizedlist>
-</para>
-</chapter>
-
-<chapter id="acknowledgements">
- <title>Acknowledgements</title>
-
-<para>
-This driver was originally derived form
-<ulink url="mailto:becker@cesdis1.gsfc.nasa.gov">Donald Becker</ulink>'s
-<ulink url="ftp://cesdis.gsfc.nasa.gov/pub/linux/drivers/kern-2.3/pci-skeleton.c"
->pci-skeleton</ulink> and
-<ulink url="ftp://cesdis.gsfc.nasa.gov/pub/linux/drivers/kern-2.3/rtl8139.c"
->rtl8139</ulink> drivers. Donald also provided various suggestion
-regarded with improvements made in revision 1.06.
-</para>
-
-<para>
-The 1.05 revision was created by
-<ulink url="mailto:cmhuang@sis.com.tw">Jim Huang</ulink>, AMD 79c901
-support was added by <ulink url="mailto:lcs@sis.com.tw">Chin-Shan Li</ulink>.
-</para>
-</chapter>
-
-<chapter id="functions">
-<title>List of Functions</title>
-!Idrivers/net/sis900.c
-</chapter>
-
-</book>
- the new routing mechanism
shaper.txt
- info on the module that can shape/limit transmitted traffic.
-sis900.txt
- - SiS 900/7016 Fast Ethernet device driver info.
sk98lin.txt
- Marvell Yukon Chipset / SysKonnect SK-98xx compliant Gigabit
Ethernet Adapter family driver info
+++ /dev/null
-
-SiS 900/7016 Fast Ethernet Device Driver
-
-Ollie Lho
-
-Lei Chun Chang
-
- Copyright © 1999 by Silicon Integrated System Corp.
-
- This document gives some information on installation and usage of SiS
- 900/7016 device driver under Linux.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or (at
- your option) any later version.
-
- This program is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- USA
- _________________________________________________________________
-
- Table of Contents
- 1. Introduction
- 2. Changes
- 3. Tested Environment
- 4. Files in This Package
- 5. Installation
-
- Building the driver as loadable module
- Building the driver into kernel
-
- 6. Known Problems and Bugs
- 7. Revision History
- 8. Acknowledgements
- _________________________________________________________________
-
-Chapter 1. Introduction
-
- This document describes the revision 1.06 and 1.07 of SiS 900/7016
- Fast Ethernet device driver under Linux. The driver is developed by
- Silicon Integrated System Corp. and distributed freely under the GNU
- General Public License (GPL). The driver can be compiled as a loadable
- module and used under Linux kernel version 2.2.x. (rev. 1.06) With
- minimal changes, the driver can also be used under 2.3.x and 2.4.x
- kernel (rev. 1.07), please see Chapter 5. If you are intended to use
- the driver for earlier kernels, you are on your own.
-
- The driver is tested with usual TCP/IP applications including FTP,
- Telnet, Netscape etc. and is used constantly by the developers.
-
- Please send all comments/fixes/questions to Lei-Chun Chang.
- _________________________________________________________________
-
-Chapter 2. Changes
-
- Changes made in Revision 1.07
-
- 1. Separation of sis900.c and sis900.h in order to move most constant
- definition to sis900.h (many of those constants were corrected)
- 2. Clean up PCI detection, the pci-scan from Donald Becker were not
- used, just simple pci_find_*.
- 3. MII detection is modified to support multiple mii transceiver.
- 4. Bugs in read_eeprom, mdio_* were removed.
- 5. Lot of sis900 irrelevant comments were removed/changed and more
- comments were added to reflect the real situation.
- 6. Clean up of physical/virtual address space mess in buffer
- descriptors.
- 7. Better transmit/receive error handling.
- 8. The driver now uses zero-copy single buffer management scheme to
- improve performance.
- 9. Names of variables were changed to be more consistent.
- 10. Clean up of auo-negotiation and timer code.
- 11. Automatic detection and change of PHY on the fly.
- 12. Bug in mac probing fixed.
- 13. Fix 630E equalier problem by modifying the equalizer workaround
- rule.
- 14. Support for ICS1893 10/100 Interated PHYceiver.
- 15. Support for media select by ifconfig.
- 16. Added kernel-doc extratable documentation.
- _________________________________________________________________
-
-Chapter 3. Tested Environment
-
- This driver is developed on the following hardware
-
- * Intel Celeron 500 with SiS 630 (rev 02) chipset
- * SiS 900 (rev 01) and SiS 7016/7014 Fast Ethernet Card
-
- and tested with these software environments
-
- * Red Hat Linux version 6.2
- * Linux kernel version 2.4.0
- * Netscape version 4.6
- * NcFTP 3.0.0 beta 18
- * Samba version 2.0.3
- _________________________________________________________________
-
-Chapter 4. Files in This Package
-
- In the package you can find these files:
-
- sis900.c
- Driver source file in C
-
- sis900.h
- Header file for sis900.c
-
- sis900.sgml
- DocBook SGML source of the document
-
- sis900.txt
- Driver document in plain text
- _________________________________________________________________
-
-Chapter 5. Installation
-
- Silicon Integrated System Corp. is cooperating closely with core Linux
- Kernel developers. The revisions of SiS 900 driver are distributed by
- the usuall channels for kernel tar files and patches. Those kernel tar
- files for official kernel and patches for kernel pre-release can be
- download at official kernel ftp site and its mirrors. The 1.06
- revision can be found in kernel version later than 2.3.15 and
- pre-2.2.14, and 1.07 revision can be found in kernel version 2.4.0. If
- you have no prior experience in networking under Linux, please read
- Ethernet HOWTO and Networking HOWTO available from Linux Documentation
- Project (LDP).
-
- The driver is bundled in release later than 2.2.11 and 2.3.15 so this
- is the most easy case. Be sure you have the appropriate packages for
- compiling kernel source. Those packages are listed in Document/Changes
- in kernel source distribution. If you have to install the driver other
- than those bundled in kernel release, you should have your driver file
- sis900.c and sis900.h copied into /usr/src/linux/drivers/net/ first.
- There are two alternative ways to install the driver
- _________________________________________________________________
-
-Building the driver as loadable module
-
- To build the driver as a loadable kernel module you have to
- reconfigure the kernel to activate network support by
-
-make menuconfig
-
- Choose "Loadable module support --->", then select "Enable loadable
- module support".
-
- Choose "Network Device Support --->", select "Ethernet (10 or
- 100Mbit)". Then select "EISA, VLB, PCI and on board controllers", and
- choose "SiS 900/7016 PCI Fast Ethernet Adapter support" to "M".
-
- After reconfiguring the kernel, you can make the driver module by
-
-make modules
-
- The driver should be compiled with no errors. After compiling the
- driver, the driver can be installed to proper place by
-
-make modules_install
-
- Load the driver into kernel by
-
-insmod sis900
-
- When loading the driver into memory, some information message can be
- view by
-
-dmesg
-
- or
-cat /var/log/message
-
- If the driver is loaded properly you will have messages similar to
- this:
-
-sis900.c: v1.07.06 11/07/2000
-eth0: SiS 900 PCI Fast Ethernet at 0xd000, IRQ 10, 00:00:e8:83:7f:a4.
-eth0: SiS 900 Internal MII PHY transceiver found at address 1.
-eth0: Using SiS 900 Internal MII PHY as default
-
- showing the version of the driver and the results of probing routine.
-
- Once the driver is loaded, network can be brought up by
-
-/sbin/ifconfig eth0 IPADDR broadcast BROADCAST netmask NETMASK media TYPE
-
- where IPADDR, BROADCAST, NETMASK are your IP address, broadcast
- address and netmask respectively. TYPE is used to set medium type used
- by the device. Typical values are "10baseT"(twisted-pair 10Mbps
- Ethernet) or "100baseT" (twisted-pair 100Mbps Ethernet). For more
- information on how to configure network interface, please refer to
- Networking HOWTO.
-
- The link status is also shown by kernel messages. For example, after
- the network interface is activated, you may have the message:
-
-eth0: Media Link On 100mbps full-duplex
-
- If you try to unplug the twist pair (TP) cable you will get
-
-eth0: Media Link Off
-
- indicating that the link is failed.
- _________________________________________________________________
-
-Building the driver into kernel
-
- If you want to make the driver into kernel, choose "Y" rather than "M"
- on "SiS 900/7016 PCI Fast Ethernet Adapter support" when configuring
- the kernel. Build the kernel image in the usual way
-
-make clean
-
-make bzlilo
-
- Next time the system reboot, you have the driver in memory.
- _________________________________________________________________
-
-Chapter 6. Known Problems and Bugs
-
- There are some known problems and bugs. If you find any other bugs
- please mail to lcchang@sis.com.tw
-
- 1. AM79C901 HomePNA PHY is not thoroughly tested, there may be some
- bugs in the "on the fly" change of transceiver.
- 2. A bug is hidden somewhere in the receive buffer management code,
- the bug causes NULL pointer reference in the kernel. This fault is
- caught before bad things happen and reported with the message:
- eth0: NULL pointer encountered in Rx ring, skipping which can be
- viewed with dmesg or cat /var/log/message.
- 3. The media type change from 10Mbps to 100Mbps twisted-pair ethernet
- by ifconfig causes the media link down.
- _________________________________________________________________
-
-Chapter 7. Revision History
-
- * November 13, 2000, Revision 1.07, seventh release, 630E problem
- fixed and further clean up.
- * November 4, 1999, Revision 1.06, Second release, lots of clean up
- and optimization.
- * August 8, 1999, Revision 1.05, Initial Public Release
- _________________________________________________________________
-
-Chapter 8. Acknowledgements
-
- This driver was originally derived form Donald Becker's pci-skeleton
- and rtl8139 drivers. Donald also provided various suggestion regarded
- with improvements made in revision 1.06.
-
- The 1.05 revision was created by Jim Huang, AMD 79c901 support was
- added by Chin-Shan Li.
---help---
This is a driver for the Fast Ethernet PCI network cards based on
the SiS 900 and SiS 7016 chips. The SiS 900 core is also embedded in
- SiS 630 and SiS 540 chipsets. If you have one of those, say Y and
- read the Ethernet-HOWTO, available at
- <http://www.tldp.org/docs.html#howto>. Please read
- <file:Documentation/networking/sis900.txt> and comments at the
- beginning of <file:drivers/net/sis900.c> for more information.
+ SiS 630 and SiS 540 chipsets.
This driver also supports AMD 79C901 HomePNA so that you can use
your phone line as a network cable.
projects / linux-2.6 / commitdiff