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| -rw-r--r-- | Documentation/networking/ltpc.txt | 131 |
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diff --git a/Documentation/networking/ltpc.txt b/Documentation/networking/ltpc.txt new file mode 100644 index 000000000..0bf3220c7 --- /dev/null +++ b/Documentation/networking/ltpc.txt @@ -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: + + append="ltpc=0x240,9,1" + +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 a configuration file in /etc/modprobe.d/ directory: + + 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 +such. + +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 + +-------------------------------------- + +Card Configuration: + +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 + +-------------------------------------- + +IP: + +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. + +-------------------------------------- + +BUGS: + +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: + Thanks to Alan Cox for helpful discussions early on in this +work, and to Denis Hainsworth for doing the bleeding-edge testing. + +-- Bradford Johnson <bradford@math.umn.edu> + +-- Updated 11/09/1998 by David Huggins-Daines <dhd@debian.org> |