Knowledge Base

Error Message: ACPI BIOS Is Attempting to Write to an Illegal IO Port Address (0x80, 0x400, 0xcf8, 0xcfc)

Article ID: 317513

Article Last Modified on 9/28/2007

APPLIES TO

Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
Microsoft Windows Server 2003, Enterprise Edition
Microsoft Windows Server 2003, Standard Edition (32-bit x86)
Microsoft Windows Server 2003, Web Edition

This article was previously published under Q317513

For a Microsoft Windows XP version of this article, see 283649.

SYMPTOMS

You may receive one or more of the following error events in the Event Viewer:

Source: ACPI
Category: None
Type: Error
Event ID: 12
User: N/A
Computer: Machine_Name
Description: AMLI: ACPI BIOS is attempting to create an illegal memory OpRegion, starting at address 0x400, with a length of 0x100. This region lies in the Operating system's protected memory address range (0x0 - 0x9fc00). This could lead to system instability. Please contact your system vendor for technical assistance.

For more information, For more information, see Help and Support Center at: http://support.microsoft.com

Source: ACPI
Category: None
Type: Error
Event ID: 5
User: N/A
Computer: Machine_Name
Description: AMLI: ACPI BIOS is attempting to write to an illegal IO port address (0xcf8), which lies in the 0xcf8 - 0xcff protected address range. This could lead to system instability. Please contact your system vendor for technical assistance.

For more information, see Help and Support Center at:
http://support.microsoft.com

Source: ACPI
Category: None
Type: Error
Event ID: 4
User: N/A
Computer: Thunderbird
Description: AMLI: ACPI BIOS is attempting to read from an illegal IO port address (0xcfc), which lies in the 0xcf8 - 0xcff protected address range. This could lead to system instability. Please contact your system vendor for technical assistance.

For more information, see Help and Support Center at:
http://support.microsoft.com

CAUSE

This behavior may occur if your computer's basic input/output system (BIOS) tries to write to a port in ACPI Machine Language (AML). This attempt causes Windows Server 2003 to prevent all access to that port.

RESOLUTION

To resolve this issue, contact your computer manufacturer or the BIOS vendor for possible updates to your computer BIOS.

For information about how to contact your computer hardware manufacturer, click the appropriate article number in the following list to view the article in the Microsoft Knowledge Base:

65416 Hardware and Software Third-Party Vendor Contact List, A-K

60781 Hardware and Software Third-Party Vendor Contact List, L-P

60782 Hardware and Software Third-Party Vendor Contact List, Q-Z

Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.

STATUS

This behavior is by design.

MORE INFORMATION

For more information about this issue, visit the following Microsoft Web site:

I/O Ports Blocked from BIOS AML on Windows XP
http://www.microsoft.com/whdc/system/pnppwr/powermgmt/BIOSAML.mspx

Keywords: kberrmsg kbprb KB317513

Microsoft KB Archive/317513

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