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