Sierra Wireless Aircard 750 GSM/GPRS

I'm hoping to get some pointers on how to make this card work as my experience 
with hardware config on freebsd is limited! I'm running Freebsd 4.6-RELEASE on 
a Sony vaio PCG-505FX. I placed a line in the pccard.conf file to match the 
card entry, and assigned a standard sio driver. When I insert the card, I get 
the card matched message, and the following resource output:

sio4 at port 0x240-0x27f irq 9 flags 0x40000 slot 0 on pccard0
sio4: type 8250
sio4: unable to activate interrupt in fast mode - using normal mode

which seems to indicate that the hardware is working. The specs from Sierra 
tell me that the communication settings for the host machine should be 
115kbps, 8-bit, no parity and one stop bit. This is where I have trouble 
understanding what happens. At this stage, I just want to be able to 
communicate with the modem and issue AT commands to check whether it's working 
etc.. but I can't get any feedback at all. I've read through the handbook on 
setting up serial lines/modems but don't fully understand what applies to my 
situation. My understanding is that the ttyd* device must be enabled to point 
to the sio interface in order for the system to communicate with the wireless 
interface.

How should I setup the tty interface? I've tried modifying the /etc/ttys line 
as indicated in the handbook as:

ttyd0 "/usr/libexec/getty std.115200" dialup on secure

this starts a getty process but doesn't seem to help when I run cu or tip, I 
get a "Line in use" error command.

When I run cu or tip without the getty process active, the application runs 
but I get no response to my typing.

Can someone point me in the right direction on what is supposed to happen, and 
how the configuration should be done? Any help much appreciated,

Thanks,

Julian Chesterfield


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