JSI Tip 6870. The ACPI BIOS is attempting to write/create an illegal memory/IO port address?

Jerold Schulman

June 22, 2003

1 Min Read
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Your event log contains postings that are similar to:

Source: ACPICategory: NoneType: ErrorEvent ID: 12User: N/AComputer: Machine_NameDescription: 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://go.microsoft.com/fwlink/events.aspSource: ACPICategory: NoneType: ErrorEvent ID: 5User: N/AComputer: Machine_NameDescription: 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://go.microsoft.com/fwlink/events.aspSource: ACPICategory: NoneType: ErrorEvent ID: 4User: N/AComputer: Machine_NameDescription: 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://go.microsoft.com/fwlink/events.asp

If you computer's BIOS tries to write to a port in ACPI Machine Language (AML), you will receive similar errors. Windows NT-based computers, including Windows XP and Windows Server 2003, do NOT allow these operations as they can cause instability.

To resolve this problem, contact your manufacturer about a BIOS upgrade.



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