Microsoft KB Archive/813820

= PCMCIA driver does not initialize Elan multifunction serial PC card =

Article ID: 813820

Article Last Modified on 8/29/2007

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APPLIES TO


 * Microsoft Windows XP Home Edition
 * Microsoft Windows XP Professional
 * Microsoft Windows 2000 Professional Edition

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SYMPTOMS
The Elan SL332 multifunction serial port PC Card uses two visual processing unit (VPU) chips (a 16550-compatible Universal Asynchronous Receiver transmitter [UART] that is designed for PCMCIA cards). However, when the COM ports are enumerated, the computer tries to start the device, but the serial port becomes disabled because the power for the port is turned off.



CAUSE
The I/O Limit register is an optional function configuration register on the card. Pcmcia.sys inadvertently tries to write this register even though the card has indicated that it does not support this register. During this attempted write, a 0x05 register is written to the configuration and status register. Bit 2 of this register (0x04) is interpreted by the device to turn off the function, as per the PCMCIA specification. The problem that is described in the &quot;Symptoms&quot; section of this article occurs because the Elan SL332 multifunction serial port PC Card implements exactly 8 bytes of configuration registers and decodes the lower 3 bits of address only.



Service pack information
To resolve this problem, obtain the latest service pack for Microsoft Windows XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

322389 How to obtain the latest Windows XP service pack

Hotfix information
A supported hotfix is now available from Microsoft. However, this hotfix is intended to correct only the problem that this article describes. Apply this hotfix only to systems that are experiencing this specific problem.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.   Date         Time   Version            Size    File name   Platform ---  06-Feb-2003  17:05  5.1.2600.1167     115,840  Pcmcia.sys  x86 06-Feb-2003 17:05  5.1.2600.1167     308,864  Pcmcia.sys  IA64

Windows 2000
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Windows 2000 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

You must restart your computer after you apply this hotfix.

The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.   Date         Time   Version         Size    File name 12-Dec-2003 09:28                  34,724  Ntdetect.com 23-Dec-2003 11:50  5.0.2195.6887   59,024  Pci.sys 10-Mar-2004 14:48  5.0.2195.6884  109,936  Pcmcia.sys



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.

Windows XP only
This problem was first corrected in Microsoft Windows XP Service Pack 2.

The third-party products that are discussed in this article are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.

Additional query words: Elan, PCMCIA fcr csr

Keywords: kbhotfixserver kbwinxpsp2fix kbwin2000presp5fix kbwinxppresp2fix kbfix kbbug kbqfe kbddk kbprb KB813820

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