  SiS 900/7016 Fast Ethernet Device Driver
  by Ollie Lho (ollie@sis.com.tw)
  November 4, 1999. Document Revision: 0.1

  This document gives some information on installation and usage of SiS
  900/7016 device driver under Linux.
  ______________________________________________________________________

  Table of Contents


  1. Introduction

  2. License

  3. Changes

  4. Tested Environment

  5. Files in This Rackage

  6. Installation

     6.1 Kernel version later than 2.2.11 and 2.3.15
        6.1.1 Building the driver as loadable module
        6.1.2 Building the driver into kernel
     6.2 Earlier Kernel Version in 2.2.x and 2.3.x Series

  7. Known Problems and Bugs

  8. Revision History

  9. Acknowledgements



  ______________________________________________________________________

  1.  Introduction

  This document describes the revision 1.06 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. With minimal changes, the
  driver can also be used under 2.3.x kernel, please see section
  ``Installation''. 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 Ollie Lho.


  2.  License










          Copyright (C) 1999 Silicon Integrated System Corp.

          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





  3.  Changes

  Changes made in Revision 1.06

  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.


  4.  Tested Environment

  This driver is developed on the following hardware

  o  Intel Celeron 336 with SiS 620 (rev 02) chipset

  o  SiS 900 (rev 01) and SiS 7016/7014 Fast Ethernet Card

     and tested with these software environments

  o  Red Hat Linux version 6.0

  o  Linux kernel version 2.2.13

  o  Netscape version 4.6

  o  NcFTP 3.0.0 beta 18

  o  Samba version 2.0.3


  5.  Files in This Rackage

  In the package you can find these files:


     sis900-2.2.x.c
        Driver source for kernel 2.2.x

     sis900-2.3.x.c
        Driver source for kernel 2.3.x

     sis900.h
        Header file for both 2.2.x and 2.3.x kernel

     sis900.sgml
        Linux-Doc SGML source of the document


  6.  Installation

  Before trying to install the driver, be sure to get the latest
  revision from SiS' Home Page.  If you have no prior experience in
  networking under Linux, please read Ethernet HOWTO and Networking
  HOWTO available from Linux Documentation Project (LDP).

  The installation procedure are different according to your kernel
  versions.


  6.1.  Kernel version later than 2.2.11 and 2.3.15

  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. There are two
  alternative ways to install the driver


  6.1.1.  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 config




  Choose "Network Device Support" to "Y" and "Ethernet Support" to "Y".
  Then you have to choose "SiS 900 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: v1.06  11/04/99
       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.




  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





  where IPADDR, BROADCAST, NETMASK are your IP address, broadcast
  address and netmask respectively. 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: Using SiS 900 Internal MII PHY as default
       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.


  6.1.2.  Building the driver into kernel

  If you want to make the driver into kernel, choose "Y" rather than "M"
  on "SiS 900 Fast Ethernet Adapter Support" when configuring the
  kernel.  Build the kernel image in the usual way



       make dep

       make clean

       make bzlilo




  Next time the system reboot, you have the driver in memory.


  6.2.  Earlier Kernel Version in 2.2.x and 2.3.x Series

  Installing the driver for earlier kernels in 2.2.x and 2.3.x series
  requires a little bit more work. First you have to copy sis900-2.x.x.c
  to /usr/src/linux/drivers/net/ and you have to modify some files
  manually (sorry !! no patch available !!)

  in Space.c, add


       extern int sis900_probe(struct device *dev);

       ...

       #ifdef CONFIG_SIS900
               {sis900_probe,0},
       #endif


  in Config.in add


       if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
               ... //other adapter drivers
               tristate 'SiS 900 PCI Fast Ethernet Adapter Support' CONFIG_SIS900
               ... //other adapter drivers
       fi




  in Makefile add


       ifeq ($(CONFIG_SIS900),y)
               L_OBJS += sis900.o
       else
               ifeq ($(CONFIG_SIS900),m)
                       M_OBJS += sis900.o
               endif
       endif




  After modifying these files, the driver can be build as described in
  the previous section.


  7.  Known Problems and Bugs

  There are some known problems and bugs. If you find any other bugs
  please mail to ollie@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.


  8.  Revision History


  o  November 4, 1999, Revision 1.06, Second release, lots of clean up
     and optimization.

  o  August 8, 1999, Revision 1.05, Initial Public Release


  9.  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.
































































