Certain R2 PC cards are incorrectly enumerated as memory cards

Symptoms

Certain R2-based PC cards may be incorrectly enumerated as memory cards (MTD-0002) if the PCMCIA CIS window was mapped in a high range (greater than 0xFF000000 in the system physical memory). Also, the card may not function correctly if it was assigned a memory resource in that range.

Cause

This behavior is caused by a bug in the Pcmcia.sys module.

Resolution

Service pack information

Windows 2000

To resolve this problem, obtain the latest service pack for Microsoft Windows 2000. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
260910 How to obtain the latest Windows 2000 service pack

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

File information

The English version of this hotfix has the file attributes (or later file attributes) 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
-----------------------------------------------------------
08/28/2001 02:33 P.M. 34,772 ntdetect.com
11/26/2001 07:39 P.M. 5.0.2195.4689 59,216 pci.sys
04/13/2002 05:52 P.M. 5.0.2195.5581 109,488 pcmcia.sys

Windows XP

To resolve this problem, obtain the latest service pack for Microsoft Windows XP. For more 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 available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table.

Date Time Version Size File name
-------------------------------------------------------
04/16/2002 11:27 A.M. 5.1.2600.42 115,584 PCMCIA.SYS

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Windows 2000 Service Pack 4. This problem was first corrected in Windows XP Service Pack 1.

More Information

The bug mentioned in the "Cause" section of this article occurs because the math that was used to compute values to address the memory window (CIS or common) was flawed. The "base" value of the memory window that needs to go into a host controller window register is the offset of that window in the system physical memory minus the window offset on the PC card. However, care was not taken to avoid a carry into the twenty-fourth bit position. This occurs only with certain values of physical memory positions, and it also depends on the memory window offset on the card. Additionally, it appears to affect only certain PC cards.

Note This issue does not occur if the memory window (CIS or common) was mapped somewhere within the first megabyte of the system physical memory, which is the preferred resource request range for the memory windows of R2 cards. But this mapping itself may cause other problems in card installation (generally error code 12) if there are not enough memory resources in that range of the physical memory (A0000 through FFFFF).
The first megabyte of system physical memory is typically divided as follows:
  • 0 through 9FFFF: Reserved
  • A0000 through DFFFF: Used to map ROMs of devices with ROM onboard. Also used to map memory windows for earlier versions of devices.
  • E0000 through FFFFF: Used to map the System BIOS. Some smaller BIOS systems use a smaller range.
For more information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the following article number to view the article in the Microsoft Knowledge Base:

265173 The Datacenter program and Windows 2000 Datacenter Server product

For more information about how to install multiple hotfixes with a single reboot, click the following article number to view the article in the Microsoft Knowledge Base:

296861 How to install multiple Windows updates or hotfixes with only one reboot

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