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- This is version 0.32
-
- CONTENTS:
-
- 1. Introduction.
- 2. License.
- 3. Files in this release.
- 4. Installation.
- 5. Problems and tuning.
- 6. Acknowledgments.
-
-
- 1. INTRODUCTION.
-
- This is an Ethernet driver for the D-Link DE-600 Ethernet pocket
- adapter for the parallel port, used with Linux on a laptop.
- Some improvements over the 0.2X releases include:
- o driver code trying to send packets end to end,
- o a more solid interrupt handler,
- o a fix that modifies the tcp protocol so that
- the DE-600 won't choke as easily on receives.
-
- This is a beta release, i.e. it ought to work! (:-)
-
- I have used this driver for NFS, ftp, telnet and X-clients on
- remote machines. Transmissions with ftp seems to work as
- good as can be expected (i.e. > 80k bytes/sec) from a
- parallel port...:-)
- The speed limit is now in the upper protocols,
- at least for a 386SX-25 :-)
-
- All comments/fixes to Bjorn Ekwall (bj0rn@blox.se).
-
- (No, I have _not_ included any support for the DE-620 yet
- since I have _no_ official documentation on how to program
- that beast. There are some code modifications in place
- already in case I get some _real_ info..., c'mon D-Link!)
-
-
- 2. LICENSE.
-
- 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, 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., 675 Mass Ave, Cambridge, MA
- 02139, USA.
-
-
- 3. FILES IN THIS RELEASE.
-
- README.DLINK This file.
- d_link.c The Source (,may it be with You :-).
-
-
- 4. INSTALLATION.
-
- o Get the latest net binaries (those referring to /conf/net).
-
- o Read the NET-2 and Ethernet HOWTO's and modify your setup.
-
- o To include networking and the DE600 in your kernel, do:
- # cd /linux
- # make config (answer yes on net and DE600)
- # make clean
- # make depend
- # make zImage (or whatever magic you usually do)
-
- o I use lilo to boot multiple kernels, so that I at least
- can have one working kernel :-). If you do too, append
- these lines to /etc/lilo/config:
-
- image = /usr/src/linux/zImage
- label = newlinux
- root = /dev/hda2 (or whatever YOU have...)
-
- # /etc/lilo/install
-
- o Do "sync" and reboot the new kernel with a D-Link pocket
- adapter connected.
-
- Now, watch for any fireworks (try to ignore (or live with)
- the smoke... :-) or:
-
- do
- read NET-FAQ and all info in /conf/net
- if fix in code needed...
- vi /linux/net/inet/d_link.c
- cd /linux
- make zImage
- /etc/lilo/install
- sync
- reboot
- endif
- try it...
- until satisfied
-
-
- 5. "PROBLEMS" AND TUNING,
-
- o Some machines have trouble handling the parallel port and
- the adapter at high speed. If you experience problems:
-
- - The adapter is not recognized at boot, i.e. an Ethernet
- adress of 00:80:c8:... is not shown, try to add another
- "; SLOW_DOWN_IO"
- at D_LINK_SLOW_DOWN near line 43. As a last resort, uncomment:
- "#define REALLY_SLOW_IO"
- near line 48 (see <asm/io.h> for hints).
-
- - You experience "timeout" messages: first try to add
- another "; SLOW_DOWN_IO" at D_LINK_SLOW_DOWN near line 22,
- _then_ try to increase the value (original value: 5)
- at "if (tickssofar < 5)" near line 424.
-
- - The adapter _is_ recognized at boot but you get
- messages about "Network Unreachable": The problem
- is probably _not_ with the d_link driver.
- Check your net configuration instead (ifconfig and route)
- in "rc.inet1".
-
- o There might be some temporary "slowdowns" when communicating
- with other systems when receiving through the TCP layer.
- A "fix" for this is made lastly in the source, in the function
- "d_link_rspace()" that is used to modify TCP if there is
- a DE-600 in use (see comments around lines 320 and 730).
-
- The aim of this fix is to reduce the possibility of more
- than two packets arriving adressed to the adapter within
- the timespan it takes to copy one packet from the adapter.
-
- Transfers with ftp with a packetsize of >= 1k will be taken
- care of with this "fix", but telnet with many small packets
- might run into problems sometimes. The "slowdown" will usually
- take care of itself, especially if there are some larger packets
- arriving now and then...
-
- There is some room for "tuning" by changing (decreasing) the
- values for "D_LINK_MAX_WINDOW" and "D_LINK_MIN_WINDOW"
- defined near the end of the file (around line 726).
- UDP (i.e. NFS) does not suffer from the same problem.
-
- o The code inside d_link_interrupt() is somewhat of a
- (educated) guesswork since my only source of information
- is the asm-source (:-), though I have tried to improve on it.
-
- o There is some rudimentary support for debugging, see
- the source. Use "-DD_LINK_DEBUG=3" when compiling.
-
-
- 6. ACKNOWLEDGMENTS.
-
- This driver wouldn't have been done without the base
- (and support) from Ross Biro (bir7@leland.stanford.edu).
- The driver also relies upon GPL-ed source from D-Link Inc.
- and from Russel Nelson at Crynwr Software (nelson@crynwr.com).
- Additional input also from Donald Becker (becker@super.org).
- Alpha release primary victim^H^H^H^H^H^Htester:
- Erik Proper (erikp@cs.kun.nl).
- Good input also from several users, most notably Mark Burton
- <markb@ordern.demon.co.uk>.
- Lastly, Fred van Kempen deserves all thanks for keeping up
- the good work which will give us all a _great_ net package!
-
-
- Happy hacking!
-
- Bjorn Ekwall == bj0rn@blox.se
-