[ILUG] Help getting ISA modem working under Linux?

[Paschal Nee]

Hi,

 

I'm looking for some help getting a modem working on Linux (Slackware-10.1).
Here's where I've got to so far.

 

The modem is internal (ISA) and was working with Win95 before I installed
Linux.  From visual inspection of the modem I can see that it contains a
Cirrus Logic CL-MD34XX chip which should work fine with Linux.

http://www.toombeola.com/board.jpg

http://free.hostdepartment.com//g/gromitkc/intel/cirrus_cl-md34xx.html
<http://free.hostdepartment.com/g/gromitkc/intel/cirrus_cl-md34xx.html> 

 

Looking at the boot messages I can see the kernel picked it up fine

bash-3.00# dmesg | grep isa
isapnp: Scanning for PnP cards...
isapnp: Card 'Logicode Technology, Inc.; Model 33H-V-P'
isapnp: 1 Plug & Play card detected total

 

I'm pretty sure the BIOS was PnP configuring it OK but just in case I forced
a configuration with the isapnp configuration file

bash-3.00# grep -v \# /etc/isapnp.conf | grep -v ^$ 
(READPORT 0x0273)
(ISOLATE PRESERVE)
(IDENTIFY *)
(VERBOSITY 2)
(CONFIGURE LTI000c/-1 (LD 0
  (IO 0 (SIZE 8) (BASE 0x03f8) (CHECK))
  (INT 0 (IRQ 4 (MODE +E)))
 (NAME "LTI000c/-1[0]{Logicode Technology, Inc.; Model 33H-V-P}")
  (ACT Y)
))
(WAITFORKEY)

Key points here being the IO port and IRQ.  The confirmation was produced by
doing a "pnpdump --config".  The docs for the version of isapnptools I'm
using say that it will detect conflicts so I should be OK there.

 

Looking at the serial configuration I have the following

bash-3.00# head /etc/serial.conf
#
# This is a sample serial.conf file.  You should uncomment out and modify
# the relevant lines as necessary.
#

# These are the standard COM1 through COM4 devices
#
/dev/ttyS0 port 0x3F8 auto_irq autoconfig 
/dev/ttyS1 port 0x2f8 auto_irq autoconfig
#/dev/ttyS2 uart 16450 port 0x3E8 irq 4
 

The autoconfig, auto_irq options seem to have picked up the correct IRQ and
configured the other bits

bash-3.00# setserial -a /dev/ttyS0
/dev/ttyS0, Line 0, UART: 16550A, Port: 0x03f8, IRQ: 4
        Baud_base: 115200, close_delay: 50, divisor: 0
        closing_wait: 3000
        Flags: spd_normal auto_irq
 

/dev/modem is linked to /dev/ttySO

bash-3.00# ls -al /dev/modem
lrwxrwxrwx  1 root root 5 2005-07-04 19:09 /dev/modem -> ttyS0
 

Based on the above, as far as I can see, the card knows the correct port/IRQ
as does the driver.  When I fire up minicom to see if all this has worked I
get nothing.  An "AT" command does not get the "OK" response it should -
there's just a blank screen.

 

So anybody got any ideas of where I could go next with this?  

*	I don't have the option of booting back into Windows to check any of
the settings but I'm pretty sure that the pnpdump setting are OK.
*	I'm suspicious that despite the chip in the card it may in fact be a
WinModem - any idea if there is any way to confirm this?
*	I'm not expecting a "do X and it will work" type answer - any other
avenues I could look at would be helpful.
*	Obviously the easiest solution would be to nip down to Peats and
pick up a PCI Linux compatible modem - the 20 euro would not kill me!  So
this is more about figuring it out than getting it done if you know what I
mean.  

 

Thanks,

Paschal.