Problems with Sierra AirCard 750

  • David Zuchowski

    David Zuchowski - 2004-05-06

    Hello.  I'm trying to get a Sierra AirCard 750 card to work on a PC/104 system.  The pcmcia card slot uses a Cirrus PD6720 ISA-to-PCMCIA bridge.  I am using pcmcia-cs-3.2.7 and kernel version 2.4.20.
    Occasionally Card Services will detect the card, but most of the time the system reboots when the card is detected.  The system works fine without the card. I read in the how-to that this is a symptom of a memory probe failure.  I have verified that the memory ranges in the config.opts file are not in use.  Linux Card Services is able to detect an old Intel Series 2 Flash memory card just fine.
    Below is my config.opts file:

    # Local PCMCIA Configuration File

    include  port 0x180-0x1bf
    include  port 0xc00-0xcff
    include memory 0xd4000-0xd4fff
    include memory 0xc3000-0xc8000

    # High port numbers do not always work...
    # include port 0x1000-0x17ff

    # Extra port range for IBM Token Ring
    #include port 0xa00-0xaff

    # Resources we should not use, even if they appear to be available

    exclude irq 3
    exclude irq 4

    # Examples of options for loadable modules

    # To fix sluggish network with IBM ethernet adapter...
    #module "pcnet_cs" opts "mem_speed=600"

    # Options for IBM Token Ring adapters
    #module "ibmtr_cs" opts "mmiobase=0xd0000 srambase=0xd4000"

    # Options for Raylink/WebGear driver: uncomment only one line...
    # Generic ad-hoc network
    module "ray_cs" opts "essid=ADHOC_ESSID hop_dwell=128 beacon_period=256 translate=1"

    # Infrastructure network for older cards
    #module "ray_cs" opts "net_type=1 essid=ESSID1"

    # Infrastructure network for WebGear
    #module "ray_cs" opts "net_type=1 essid=ESSID1 translate=1 hop_dwell=128 beacon_period=256"

    # Options for WaveLAN/IEEE driver (AccessPoint mode)...
    #module "wvlan_cs" opts "station_name=MY_PC"

    # Options for WaveLAN/IEEE driver (ad-hoc mode)...
    #module "wvlan_cs" opts "port_type=3 channel=1 station_name=MY_PC"

    # Options for Xircom Netwave driver...
    #module "netwave_cs" opts "domain=0x100 scramble_key=0x0"

    In the howto it mentions that sometimes this memory probe failures could be do to a timing problem.  Does anyone have any recommendations on which timing parameters I should try and what values?

    Any help is appreciated.

    • David Hinds

      David Hinds - 2004-05-08

      I don't think it is a memory probe issue.  When you say the system often reboots when the card is detected, can you be any more specific about the timing?  i.e., can you tell if the system gets as far as loading the driver for the card?  For the times that it does not reboot, does the card then work fine?  If it works once, if you then eject & reinsert, does it still usually reboot?

      -- Dave

    • David Hinds

      David Hinds - 2004-07-16

      I now have a confirmed report that the Sierra AirCard draws a LOT of power at insertion time.  Most likely, the card is drawing more power than your system can provide.

      -- Dave


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