132 lines
4.7 KiB
Plaintext
132 lines
4.7 KiB
Plaintext
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>
|