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Question Modem IO error 

Forum: PCMCIA Serial and Modem Issues
Date: 2000, Apr 16
From: Pawel Konieczny konieczp

This is a cross-post from comp.os.linux.portable (sorry David, I couldn't help it, maybe somebody here recognises the problem):

The card is properly recognised by the cardmgr, which assigns ttyS1 to it, but when I try to use /dev/ttyS1 I get 
an "input/output error" (if root) or "Operation not allowed for device" (if user).

Does anybody recognise the problem? Do you know the solution?
It seems a configuration problem to me, rather than a PCMCIA problem, but I really don't know. I am new to Linux (two weeks).


Here are some details for those of you who are ready to help me:

DELL Latitude CPi

Debian GNU/Linux 2.1 (try Linux because of the free software idea, not ease of use)
Linux kernel 2.2.12

ii  pcmcia-cs       3.0.14-0slink1 PCMCIA Card Services for Linux.
upgraded to: 3.1.8

Tried two different cards:
RBEM56G-100 (Xircom RealPort CardBus Ethernet 10/100+Modem 56)
CM33 (Xircom GlobalAccess CreditCard Modem 33.6)
-- both recognised and configured smoothly by cardmgr

Here is the contents of /var/state/pcmcia/stab for the first card:
Socket 0: empty
Socket 1: Xircom CardBus 10/100 Ethernet + 56K Modem
1       network tulip_cb   0 eth0
1       serial  serial_cb  0 ttyS1 4 65

Here is the contents of /var/state/pcmcia/stab for the second card:
Socket 0: Serial or Modem
0       serial  serial_cs  0 ttyS1 4 65
Socket 1: empty

$ ls -l /dev/ttyS1
crw-rw-rw-   1 root     dialout    4,  65 Sep  9  1999 /dev/ttyS1

Things I tied (without success)
* read all serial-port or PCMCIA related HOWTOS
* scan for existing posts to newsgroups on this subject
* laptop istallation tips published on the web (selectively)
* disabled infrared ports in BIOS
* upgraded BIOS to the latest (two months old)
* upgraded pcmcia package to the latest stable release 3.1.8
* inserted and removed the card several times (recognition OK)
* tried an external modem on ttyS0 - works fine
* ifconfig eth0 down
* modified /etc/pcmcia/config not to load tulip_cb for
  RBEM56G-100(tulip_cb is tagged as "unreliable" in PCMCIA 
  HOWTO, but funny enough, my eth0 works fine with it!)
* Upgraded to PCMCIA 3.1.14
* Removed /dev/ttyS1 - cardmgr recreated it at insertion

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Messages Inline: 1 All Outline: 1 2 All

1. None Fixed in 3.1.14 by David Hinds, 2000, Apr 19
(_ Ok It is, indeed! by Pawel Konieczny, 2000, Apr 25

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