Diffstat (limited to 'Documentation/networking/ltpc.txt')
1 files changed, 131 insertions, 0 deletions
diff --git a/Documentation/networking/ltpc.txt b/Documentation/networking/ltpc.txt
new file mode 100644
@@ -0,0 +1,131 @@
+This is the ALPHA version of the ltpc driver.
+In order to use it, you will need at least version 1.3.3 of the
+netatalk package, and the Apple or Farallon LocalTalk PC card.
+There are a number of different LocalTalk cards for the PC; this
+driver applies only to the one with the 65c02 processor chip on it.
+To include it in the kernel, select the CONFIG_LTPC switch in the
+configuration dialog. You can also compile it as a module.
+While the driver will attempt to autoprobe the I/O port address, IRQ
+line, and DMA channel of the card, this does not always work. For
+this reason, you should be prepared to supply these parameters
+yourself. (see "Card Configuration" below for how to determine or
+change the settings on your card)
+When the driver is compiled into the kernel, you can add a line such
+as the following to your /etc/lilo.conf:
+where the parameters (in order) are the port address, IRQ, and DMA
+channel. The second and third values can be omitted, in which case
+the driver will try to determine them itself.
+If you load the driver as a module, you can pass the parameters "io=",
+"irq=", and "dma=" on the command line with insmod or modprobe, or add
+them as options in /etc/modprobe.conf:
+ alias lt0 ltpc # autoload the module when the interface is configured
+ options ltpc io=0x240 irq=9 dma=1
+Before starting up the netatalk demons (perhaps in rc.local), you
+need to add a line such as:
+ /sbin/ifconfig lt0 127.0.0.42
+The address is unimportant - however, the card needs to be configured
+with ifconfig so that Netatalk can find it.
+The appropriate netatalk configuration depends on whether you are
+attached to a network that includes AppleTalk routers or not. If,
+like me, you are simply connecting to your home Macintoshes and
+printers, you need to set up netatalk to "seed". The way I do this
+is to have the lines
+ dummy -seed -phase 2 -net 2000 -addr 2000.26 -zone "1033"
+ lt0 -seed -phase 1 -net 1033 -addr 1033.27 -zone "1033"
+in my atalkd.conf. What is going on here is that I need to fool
+netatalk into thinking that there are two AppleTalk interfaces
+present; otherwise, it refuses to seed. This is a hack, and a more
+permanent solution would be to alter the netatalk code. Also, make
+sure you have the correct name for the dummy interface - If it's
+compiled as a module, you will need to refer to it as "dummy0" or some
+If you are attached to an extended AppleTalk network, with routers on
+it, then you don't need to fool around with this -- the appropriate
+line in atalkd.conf is
+ lt0 -phase 1
+The interrupts and so forth are configured via the dipswitch on the
+board. Set the switches so as not to conflict with other hardware.
+ Interrupts -- set at most one. If none are set, the driver uses
+ polled mode. Because the card was developed in the XT era, the
+ original documentation refers to IRQ2. Since you'll be running
+ this on an AT (or later) class machine, that really means IRQ9.
+ SW1 IRQ 4
+ SW2 IRQ 3
+ SW3 IRQ 9 (2 in original card documentation only applies to XT)
+ DMA -- choose DMA 1 or 3, and set both corresponding switches.
+ SW4 DMA 3
+ SW5 DMA 1
+ SW6 DMA 3
+ SW7 DMA 1
+ I/O address -- choose one.
+ SW8 220 / 240
+Yes, it is possible to do IP over LocalTalk. However, you can't just
+treat the LocalTalk device like an ordinary Ethernet device, even if
+that's what it looks like to Netatalk.
+Instead, you follow the same procedure as for doing IP in EtherTalk.
+See Documentation/networking/ipddp.txt for more information about the
+kernel driver and userspace tools needed.
+IRQ autoprobing often doesn't work on a cold boot. To get around
+this, either compile the driver as a module, or pass the parameters
+for the card to the kernel as described above.
+Also, as usual, autoprobing is not recommended when you use the driver
+as a module. (though it usually works at boot time, at least)
+Polled mode is *really* slow sometimes, but this seems to depend on
+the configuration of the network.
+It may theoretically be possible to use two LTPC cards in the same
+machine, but this is unsupported, so if you really want to do this,
+you'll probably have to hack the initialization code a bit.
+ Thanks to Alan Cox for helpful discussions early on in this
+work, and to Denis Hainsworth for doing the bleeding-edge testing.
+-- Bradford Johnson <email@example.com>
+-- Updated 11/09/1998 by David Huggins-Daines <firstname.lastname@example.org>