1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
132 lines
4.6 KiB
Plaintext
132 lines
4.6 KiB
Plaintext
This is the ALPHA version of the ltpc driver.
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In order to use it, you will need at least version 1.3.3 of the
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netatalk package, and the Apple or Farallon LocalTalk PC card.
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There are a number of different LocalTalk cards for the PC; this
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driver applies only to the one with the 65c02 processor chip on it.
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To include it in the kernel, select the CONFIG_LTPC switch in the
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configuration dialog. You can also compile it as a module.
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While the driver will attempt to autoprobe the I/O port address, IRQ
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line, and DMA channel of the card, this does not always work. For
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this reason, you should be prepared to supply these parameters
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yourself. (see "Card Configuration" below for how to determine or
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change the settings on your card)
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When the driver is compiled into the kernel, you can add a line such
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as the following to your /etc/lilo.conf:
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append="ltpc=0x240,9,1"
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where the parameters (in order) are the port address, IRQ, and DMA
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channel. The second and third values can be omitted, in which case
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the driver will try to determine them itself.
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If you load the driver as a module, you can pass the parameters "io=",
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"irq=", and "dma=" on the command line with insmod or modprobe, or add
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them as options in /etc/modprobe.conf:
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alias lt0 ltpc # autoload the module when the interface is configured
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options ltpc io=0x240 irq=9 dma=1
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Before starting up the netatalk demons (perhaps in rc.local), you
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need to add a line such as:
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/sbin/ifconfig lt0 127.0.0.42
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The address is unimportant - however, the card needs to be configured
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with ifconfig so that Netatalk can find it.
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The appropriate netatalk configuration depends on whether you are
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attached to a network that includes AppleTalk routers or not. If,
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like me, you are simply connecting to your home Macintoshes and
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printers, you need to set up netatalk to "seed". The way I do this
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is to have the lines
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dummy -seed -phase 2 -net 2000 -addr 2000.26 -zone "1033"
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lt0 -seed -phase 1 -net 1033 -addr 1033.27 -zone "1033"
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in my atalkd.conf. What is going on here is that I need to fool
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netatalk into thinking that there are two AppleTalk interfaces
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present; otherwise, it refuses to seed. This is a hack, and a more
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permanent solution would be to alter the netatalk code. Also, make
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sure you have the correct name for the dummy interface - If it's
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compiled as a module, you will need to refer to it as "dummy0" or some
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such.
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If you are attached to an extended AppleTalk network, with routers on
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it, then you don't need to fool around with this -- the appropriate
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line in atalkd.conf is
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lt0 -phase 1
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--------------------------------------
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Card Configuration:
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The interrupts and so forth are configured via the dipswitch on the
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board. Set the switches so as not to conflict with other hardware.
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Interrupts -- set at most one. If none are set, the driver uses
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polled mode. Because the card was developed in the XT era, the
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original documentation refers to IRQ2. Since you'll be running
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this on an AT (or later) class machine, that really means IRQ9.
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SW1 IRQ 4
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SW2 IRQ 3
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SW3 IRQ 9 (2 in original card documentation only applies to XT)
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DMA -- choose DMA 1 or 3, and set both corresponding switches.
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SW4 DMA 3
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SW5 DMA 1
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SW6 DMA 3
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SW7 DMA 1
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I/O address -- choose one.
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SW8 220 / 240
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--------------------------------------
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IP:
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Yes, it is possible to do IP over LocalTalk. However, you can't just
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treat the LocalTalk device like an ordinary Ethernet device, even if
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that's what it looks like to Netatalk.
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Instead, you follow the same procedure as for doing IP in EtherTalk.
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See Documentation/networking/ipddp.txt for more information about the
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kernel driver and userspace tools needed.
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--------------------------------------
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BUGS:
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IRQ autoprobing often doesn't work on a cold boot. To get around
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this, either compile the driver as a module, or pass the parameters
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for the card to the kernel as described above.
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Also, as usual, autoprobing is not recommended when you use the driver
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as a module. (though it usually works at boot time, at least)
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Polled mode is *really* slow sometimes, but this seems to depend on
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the configuration of the network.
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It may theoretically be possible to use two LTPC cards in the same
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machine, but this is unsupported, so if you really want to do this,
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you'll probably have to hack the initialization code a bit.
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______________________________________
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THANKS:
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Thanks to Alan Cox for helpful discussions early on in this
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work, and to Denis Hainsworth for doing the bleeding-edge testing.
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-- Bradford Johnson <bradford@math.umn.edu>
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-- Updated 11/09/1998 by David Huggins-Daines <dhd@debian.org>
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