linux/Documentation/networking/ltpc.txt
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   1This is the ALPHA version of the ltpc driver.
   2
   3In order to use it, you will need at least version 1.3.3 of the
   4netatalk package, and the Apple or Farallon LocalTalk PC card.
   5There are a number of different LocalTalk cards for the PC; this
   6driver applies only to the one with the 65c02 processor chip on it.
   7
   8To include it in the kernel, select the CONFIG_LTPC switch in the
   9configuration dialog.  You can also compile it as a module.
  10
  11While the driver will attempt to autoprobe the I/O port address, IRQ
  12line, and DMA channel of the card, this does not always work.  For
  13this reason, you should be prepared to supply these parameters
  14yourself.  (see "Card Configuration" below for how to determine or
  15change the settings on your card)
  16
  17When the driver is compiled into the kernel, you can add a line such
  18as the following to your /etc/lilo.conf:
  19
  20 append="ltpc=0x240,9,1"
  21
  22where the parameters (in order) are the port address, IRQ, and DMA
  23channel.  The second and third values can be omitted, in which case
  24the driver will try to determine them itself.
  25
  26If you load the driver as a module, you can pass the parameters "io=",
  27"irq=", and "dma=" on the command line with insmod or modprobe, or add
  28them as options in a configuration file in /etc/modprobe.d/ directory:
  29
  30 alias lt0 ltpc # autoload the module when the interface is configured
  31 options ltpc io=0x240 irq=9 dma=1
  32
  33Before starting up the netatalk demons (perhaps in rc.local), you
  34need to add a line such as:
  35
  36 /sbin/ifconfig lt0 127.0.0.42
  37
  38The address is unimportant - however, the card needs to be configured
  39with ifconfig so that Netatalk can find it.
  40
  41The appropriate netatalk configuration depends on whether you are
  42attached to a network that includes AppleTalk routers or not.  If,
  43like me, you are simply connecting to your home Macintoshes and
  44printers, you need to set up netatalk to "seed".  The way I do this
  45is to have the lines
  46
  47 dummy -seed -phase 2 -net 2000 -addr 2000.26 -zone "1033"
  48 lt0 -seed -phase 1 -net 1033 -addr 1033.27 -zone "1033"
  49
  50in my atalkd.conf.  What is going on here is that I need to fool
  51netatalk into thinking that there are two AppleTalk interfaces
  52present; otherwise, it refuses to seed.  This is a hack, and a more
  53permanent solution would be to alter the netatalk code.  Also, make
  54sure you have the correct name for the dummy interface - If it's
  55compiled as a module, you will need to refer to it as "dummy0" or some
  56such.
  57
  58If you are attached to an extended AppleTalk network, with routers on
  59it, then you don't need to fool around with this -- the appropriate
  60line in atalkd.conf is
  61
  62 lt0 -phase 1
  63
  64--------------------------------------
  65
  66Card Configuration:
  67
  68The interrupts and so forth are configured via the dipswitch on the
  69board.  Set the switches so as not to conflict with other hardware.
  70
  71       Interrupts -- set at most one.  If none are set, the driver uses
  72       polled mode.  Because the card was developed in the XT era, the
  73       original documentation refers to IRQ2.  Since you'll be running
  74       this on an AT (or later) class machine, that really means IRQ9.
  75
  76       SW1     IRQ 4
  77       SW2     IRQ 3
  78       SW3     IRQ 9 (2 in original card documentation only applies to XT)
  79
  80
  81       DMA -- choose DMA 1 or 3, and set both corresponding switches.
  82
  83       SW4     DMA 3
  84       SW5     DMA 1
  85       SW6     DMA 3
  86       SW7     DMA 1
  87
  88
  89       I/O address -- choose one.
  90
  91       SW8     220 / 240
  92
  93--------------------------------------
  94
  95IP:
  96
  97Yes, it is possible to do IP over LocalTalk.  However, you can't just
  98treat the LocalTalk device like an ordinary Ethernet device, even if
  99that's what it looks like to Netatalk.
 100
 101Instead, you follow the same procedure as for doing IP in EtherTalk.
 102See Documentation/networking/ipddp.txt for more information about the
 103kernel driver and userspace tools needed.
 104
 105--------------------------------------
 106
 107BUGS:
 108
 109IRQ autoprobing often doesn't work on a cold boot.  To get around
 110this, either compile the driver as a module, or pass the parameters
 111for the card to the kernel as described above.
 112
 113Also, as usual, autoprobing is not recommended when you use the driver
 114as a module. (though it usually works at boot time, at least)
 115
 116Polled mode is *really* slow sometimes, but this seems to depend on
 117the configuration of the network.
 118
 119It may theoretically be possible to use two LTPC cards in the same
 120machine, but this is unsupported, so if you really want to do this,
 121you'll probably have to hack the initialization code a bit.
 122
 123______________________________________
 124
 125THANKS:
 126        Thanks to Alan Cox for helpful discussions early on in this
 127work, and to Denis Hainsworth for doing the bleeding-edge testing.
 128
 129-- Bradford Johnson <bradford@math.umn.edu>
 130
 131-- Updated 11/09/1998 by David Huggins-Daines <dhd@debian.org>
 132
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