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Date: Fri, 01 Jun 2001 06:19:05 -0500
From: Marvin Stodolsky <>
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To: LinModems <>,
 	Joern Wuestenfeld <>,
 	"[MAS] Jack" <>
Subject: PCMCIA ltmodem & serial_cs
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With respect to the role of serial_cs
Concur that it is NOT appearing in the ioports listing below.
Rather, while listed as a kernel module,
It's role appears to be that of a daemon managing the serial port,
for my system /dev/ttyS3. Noticed that if PPP is not shut down in a
"clean fashion" (though I can't precisely define this yet), then 
$ rmmod serial_cs
is necessary to close /dev/ttyS3 before a new dialout can be successful.

Please note that I'm proceeding through these tests from my background
of a biologist, pushing and proding to see what results will be, rather
than someone with a true knowledge of the underlying code.

# uname -r
          # cat /etc/pcmcia.conf
# PCIC=yenta_socket
echo PCIC = $PCIC

$ grep lt_ /etc/modules.conf

# lt_drivers: autoloading and insertion parameter usage
# alias char-major-62 lt_serial << Not useful for PCMCIA modem
# for special case of pcmcia lt_modem below
options lt_modem Forced=3,0xbc,0x2f8
above serial_cs lt_modem
# above two lines just load lt_modem with "/etc/init.d/pcmcia start"
# section for lt_drivers ends     

# lsmod
Module                  Size  Used by
ppp_deflate            39200   1  (autoclean)
bsd_comp                4144   0  (autoclean)
ppp_async               6192   1  (autoclean)
ppp_generic            13104   3  (autoclean) [ppp_deflate bsd_comp
slhc                    4736   1  (autoclean) [ppp_generic]
lt_modem              316288   0  (unused)
serial_cs               4528   0  (unused)
ds                      6592   2  [serial_cs]
i82365                 11904   2
pcmcia_core            38912   0  [serial_cs ds i82365] 

# cat /proc/interrupts
  0:     252555          XT-PIC  timer
  1:       6287          XT-PIC  keyboard
  2:          0          XT-PIC  cascade
  3:        440          XT-PIC  serial  << with start of modem
  4:      30009          XT-PIC  serial  << mouse
 11:          0          XT-PIC  ide2
 14:       5475          XT-PIC  ide0
 15:          4          XT-PIC  ide1
NMI:          0
ERR:          0            

Note below, no serial_cs, rather modem port from above
# cat /proc/ioports
0000-001f : dma1
0020-003f : pic1
0040-005f : timer
0060-006f : keyboard
0080-008f : dma page reg
00a0-00bf : pic2
00c0-00df : dma2
00f0-00ff : fpu
0170-0177 : ide1
01e8-01ef : ide2
01f0-01f7 : ide0
02e8-02ef : serial(set)
02f8-02ff : serial(auto) <<<<
0376-0376 : ide1
03c0-03df : vga+
03e0-03e1 : i82365
03ee-03ee : ide2
03f6-03f6 : ide0
03f8-03ff : serial(set)
0cf8-0cff : PCI conf1
5c20-5c3f : Acer Laboratories Inc. [ALi] M7101 PMU
b400-b40f : Acer Laboratories Inc. [ALi] M5229 IDE
  b400-b407 : ide0
  b408-b40f : ide1
b800-b8ff : PCI device 1813:4000 (Ambient Technologies Inc)
d000-dfff : PCI Bus #01
  d800-d8ff : ATI Technologies Inc Rage 128 RF      

-------- Original Message --------
Subject: Joern & Jack
Date: Fri, 01 Jun 2001 05:09:07 -0500
From: Marvin Stodolsky <>
To: Joern Wuestenfeld <>,"[MAS] Jack"
References: <>


Please copy to Jack, who has been working hard on this PCMCIA problem as
a Linux Newbie.  You are in the same Time Zone I presume.

Note my kernel 2.4.4 choices for PCMCIA displayed by:
$ grep PCMCIA config-2.4.4 | grep -v not

# PCMCIA/CardBus support
# PCMCIA network device support
# PCMCIA character devices

Being way done in
# PCMCIA character devices

and NOT a default choice under 2.4.nn
is TOO easy to miss!  I did in my 1st 2.4.4 kernel compile.
The Configure/help info block is:

  Say Y here to enable support for 16-bit PCMCIA serial devices,
  including serial port cards, modems, and the modem functions of
  multi-function ethernet/modem cards. (PCMCIA- or PC-cards are
  credit-card size devices often used with laptops.)
  This driver is also available as a module ( = code which can be
  inserted in and removed from the running kernel whenever you want).
  The module will be called serial_cs.o. If you want to compile it as
  a module, say M here and read Documentation/modules.txt. If unsure,
  say N.                                

My relevant modules are:

ls /lib/modules/2.4.4/kernel/drivers/char/
agp  ham.o      joystick  lt_modem.o   lt_serial.o   pcmcia   rtc.o
drm  hamcore.o  lp.o      lt_modem.o~  lt_serial.o~  ppdev.o
stodolsk:/boot# ls /lib/modules/2.4.4/kernel/drivers/char/pcmcia

stodolsk:/boot# ls /lib/modules/2.4.4/kernel/drivers/pcmcia
cb_enabler.o  ds.o  i82365.o  pcmcia_core.o  yenta_socket.o

Note that I am NOT yet using the new yenta_socket yet, but the 2.2.nn

stodolsk:/boot# cat /etc/pcmcia.conf
# PCIC=yenta_socket
echo PCIC = $PCIC

This is simply because I first got the PCMCIA working under 2.2.18 with 
BIOS choise NOT PNP, 
I have yet to try yenta_socket with this PCMCIA modem.
I expect BIOS PNP yes will be fine too, but haven't tested yet.

BUt thus far, service under 2.2.18 and 2.4.4 is reliable.
Found that sometimes 
$ rmmod serial_cs
is necessary to close the /dev/ttyS3 before a new PPP 

Joern Wuestenfeld wrote:
> Hi Marv,
> I tried your suggestion yesterday with my PCMCIA modem. It did not work. All
> modules load succesfuly, but I can not access the modem. I always get "Modem
> busy".
> I also can't see the serial_cs in the output of /proc/ioports. I only see two
> entries from serial, which are my serial port and the IRda port. Also in
> /dev/tty/drivers there is now entry for serial_cs in contrast to when loading
> the lt_serial driver! With setserial I also don't get any hint to a lt_modem.
> Over this long weekend now I will investigate this problem further and hope to
> have some progress to report.
> Have a nice weekend
> Joern
Subject:   Re: Extensive PCMCIA ltmodem tests, OK
       Date:  Thu, 31 May 2001 20:29:03 +1200
       From:    "[MAS] Jack" <>
         To:    "Marvin Stodolsky" <>

I can load now lt_serial and lt_modem
but no serical_cs is loaded...
I have the pcmcia-cs installed
under vwdialconf no mode is found  and I will try minicom later
If you tell me where the report2.txt is saved it would be nice.
If I run it in /root/
it is saved as well in root or not?
Anywhere I try some stuff out now..and maybe it is working

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Last modified: Wed Jul 30 11:02:43 EDT 2003