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-This is the 6pack-mini-HOWTO, written by
-
-Andreas Könsgen DG3KQ
-Internet: ajk@comnets.uni-bremen.de
-AMPR-net: dg3kq@db0pra.ampr.org
-AX.25:    dg3kq@db0ach.#nrw.deu.eu
-
-Last update: April 7, 1998
-
-1. What is 6pack, and what are the advantages to KISS?
-
-6pack is a transmission protocol for data exchange between the PC and
-the TNC over a serial line. It can be used as an alternative to KISS.
-
-6pack has two major advantages:
-- The PC is given full control over the radio
-  channel. Special control data is exchanged between the PC and the TNC so
-  that the PC knows at any time if the TNC is receiving data, if a TNC
-  buffer underrun or overrun has occurred, if the PTT is
-  set and so on. This control data is processed at a higher priority than
-  normal data, so a data stream can be interrupted at any time to issue an
-  important event. This helps to improve the channel access and timing 
-  algorithms as everything is computed in the PC. It would even be possible 
-  to experiment with something completely different from the known CSMA and 
-  DAMA channel access methods.
-  This kind of real-time control is especially important to supply several
-  TNCs that are connected between each other and the PC by a daisy chain
-  (however, this feature is not supported yet by the Linux 6pack driver).
-
-- Each packet transferred over the serial line is supplied with a checksum,
-  so it is easy to detect errors due to problems on the serial line.
-  Received packets that are corrupt are not passed on to the AX.25 layer.
-  Damaged packets that the TNC has received from the PC are not transmitted.
-
-More details about 6pack are described in the file 6pack.ps that is located
-in the doc directory of the AX.25 utilities package.
-
-2. Who has developed the 6pack protocol?
-
-The 6pack protocol has been developed by Ekki Plicht DF4OR, Henning Rech
-DF9IC and Gunter Jost DK7WJ. A driver for 6pack, written by Gunter Jost and
-Matthias Welwarsky DG2FEF, comes along with the PC version of FlexNet.
-They have also written a firmware for TNCs to perform the 6pack
-protocol (see section 4 below).
-
-3. Where can I get the latest version of 6pack for LinuX?
-
-At the moment, the 6pack stuff can obtained via anonymous ftp from
-db0bm.automation.fh-aachen.de. In the directory /incoming/dg3kq,
-there is a file named 6pack.tgz.
-
-4. Preparing the TNC for 6pack operation
-
-To be able to use 6pack, a special firmware for the TNC is needed. The EPROM
-of a newly bought TNC does not contain 6pack, so you will have to
-program an EPROM yourself. The image file for 6pack EPROMs should be
-available on any packet radio box where PC/FlexNet can be found. The name of
-the file is 6pack.bin. This file is copyrighted and maintained by the FlexNet
-team. It can be used under the terms of the license that comes along
-with PC/FlexNet. Please do not ask me about the internals of this file as I
-don't know anything about it. I used a textual description of the 6pack
-protocol to program the Linux driver.
-
-TNCs contain a 64kByte EPROM, the lower half of which is used for
-the firmware/KISS. The upper half is either empty or is sometimes
-programmed with software called TAPR. In the latter case, the TNC
-is supplied with a DIP switch so you can easily change between the
-two systems. When programming a new EPROM, one of the systems is replaced
-by 6pack. It is useful to replace TAPR, as this software is rarely used
-nowadays. If your TNC is not equipped with the switch mentioned above, you
-can build in one yourself that switches over the highest address pin
-of the EPROM between HIGH and LOW level. After having inserted the new EPROM
-and switched to 6pack, apply power to the TNC for a first test. The connect
-and the status LED are lit for about a second if the firmware initialises
-the TNC correctly.
-
-5. Building and installing the 6pack driver
-
-The driver has been tested with kernel version 2.1.90. Use with older
-kernels may lead to a compilation error because the interface to a kernel
-function has been changed in the 2.1.8x kernels.
-
-How to turn on 6pack support:
-
-- In the linux kernel configuration program, select the code maturity level
-  options menu and turn on the prompting for development drivers.
-
-- Select the amateur radio support menu and turn on the serial port 6pack
-  driver.
-
-- Compile and install the kernel and the modules.
-
-To use the driver, the kissattach program delivered with the AX.25 utilities
-has to be modified.
-
-- Do a cd to the directory that holds the kissattach sources. Edit the
-  kissattach.c file. At the top, insert the following lines:
-
-  #ifndef N_6PACK
-  #define N_6PACK (N_AX25+1)
-  #endif
-
-  Then find the line
-   
-  int disc = N_AX25;
-
-  and replace N_AX25 by N_6PACK.
-
-- Recompile kissattach. Rename it to spattach to avoid confusions.
-
-Installing the driver:
-
-- Do an insmod 6pack. Look at your /var/log/messages file to check if the 
-  module has printed its initialization message.
-
-- Do a spattach as you would launch kissattach when starting a KISS port.
-  Check if the kernel prints the message '6pack: TNC found'. 
-
-- From here, everything should work as if you were setting up a KISS port.
-  The only difference is that the network device that represents
-  the 6pack port is called sp instead of sl or ax. So, sp0 would be the
-  first 6pack port.
-
-Although the driver has been tested on various platforms, I still declare it
-ALPHA. BE CAREFUL! Sync your disks before insmoding the 6pack module
-and spattaching. Watch out if your computer behaves strangely. Read section
-6 of this file about known problems.
-
-Note that the connect and status LEDs of the TNC are controlled in a
-different way than they are when the TNC is used with PC/FlexNet. When using
-FlexNet, the connect LED is on if there is a connection; the status LED is
-on if there is data in the buffer of the PC's AX.25 engine that has to be
-transmitted. Under Linux, the 6pack layer is beyond the AX.25 layer,
-so the 6pack driver doesn't know anything about connects or data that
-has not yet been transmitted. Therefore the LEDs are controlled
-as they are in KISS mode: The connect LED is turned on if data is transferred
-from the PC to the TNC over the serial line, the status LED if data is
-sent to the PC.
-
-6. Known problems
-
-When testing the driver with 2.0.3x kernels and
-operating with data rates on the radio channel of 9600 Baud or higher,
-the driver may, on certain systems, sometimes print the message '6pack:
-bad checksum', which is due to data loss if the other station sends two
-or more subsequent packets. I have been told that this is due to a problem
-with the serial driver of 2.0.3x kernels. I don't know yet if the problem
-still exists with 2.1.x kernels, as I have heard that the serial driver
-code has been changed with 2.1.x.
-
-When shutting down the sp interface with ifconfig, the kernel crashes if
-there is still an AX.25 connection left over which an IP connection was
-running, even if that IP connection is already closed. The problem does not
-occur when there is a bare AX.25 connection still running. I don't know if
-this is a problem of the 6pack driver or something else in the kernel.
-
-The driver has been tested as a module, not yet as a kernel-builtin driver.
-
-The 6pack protocol supports daisy-chaining of TNCs in a token ring, which is
-connected to one serial port of the PC. This feature is not implemented
-and at least at the moment I won't be able to do it because I do not have
-the opportunity to build a TNC daisy-chain and test it.
-
-Some of the comments in the source code are inaccurate. They are left from
-the SLIP/KISS driver, from which the 6pack driver has been derived.
-I haven't modified or removed them yet -- sorry! The code itself needs
-some cleaning and optimizing. This will be done in a later release.
-
-If you encounter a bug or if you have a question or suggestion concerning the
-driver, feel free to mail me, using the addresses given at the beginning of
-this file.
-
-Have fun!
-
-Andreas