The Winmsd.exe Tool Displays Wrong Interrupt for PCI Device
ID: Q180287
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The information in this article applies to:
-
Microsoft Windows NT Workstation versions 3.5, 3.51, 4.0
-
Microsoft Windows NT Server versions 3.5, 3.51, 4.0
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Microsoft Windows 2000 Professional
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Microsoft Windows 2000 Server
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Microsoft Windows 2000 Advanced Server
SYMPTOMS
If you use the Windows NT Diagnostics (Winmsd.exe) tool on a computer
that adheres to Intel Multi-Processor Specification (MPS) v1.4, the IRQ
displayed for Peripheral Component Interconnect (PCI) devices may be
incorrect.
For example, the following information may be displayed in the IRQ And
Port report when you run the Winmsd.exe tool on a computer that is
using the MPS Hardware Abstraction Layer (HAL):
| Devices |
Vector |
Level |
Affinity |
|---|
| i8042prt |
1 |
1 |
0xffffffff |
| i8042prt |
12 |
12 |
0xffffffff |
| Serial |
4 |
4 |
0x00000000 |
| Serial |
3 |
3 |
0x00000000 |
| El59x |
32 |
32 |
0x80719ce0 |
| Floppy |
6 |
6 |
0x00000000 |
| sndblst |
178 |
5 |
0x00000001 |
| aic78xx |
40 |
40 |
0x00000000 |
NOTE: The IRQs for the El59x and Aic78xx PCI devices are incorrect.
CAUSE
This problem occurs because the Winmsd.exe tool displays IRQ
information directly from the MPS interrupt table. The MPS v4.1
specification changes the format of PCI devices in the MPS interrupt table
to improve support for multiple PCI bus configurations. This results in
the Winmsd.exe tool displaying the PCI INT signal value as the Source
Bus IRQ instead of displaying the correct IRQ as the Source Bus IRQ.
RESOLUTION
To troubleshoot possible IRQ conflicts on a MPS v1.4-based computer using
the Winmsd.exe tool, use the normal uni-processor HAL to resolve the
resource conflict, and then change back to the MPS HAL.
To temporarily use the uni-processor HAL and kernel files, follow these
steps:
- Copy the Hal.dll file and Ntoskrnl.exe file from the Windows NT CD-ROM
(or Windows NT Service Pack folder if a Service Pack is installed) to a
temporary folder.
- Rename the Hal.dll file to Unihal.dll, and rename the Ntoskrnl.exe file
to Unikrnl.exe.
- Copy the files you renamed in step 2 to the %systemroot%\winnt\system32
folder.
- Remove the read only attribute from the Boot.ini file. To do so, type
the following command at a command prompt, and then press ENTER
attrib -s -h -r <system root>\boot.ini
where <system root> is the drive on which your boot files are located.
- Use any text editor (such as Notepad) to modify the [operating system]
section to read:
[operating systems]
multi(0)disk ....\WINNT40="Windows NT Server Version 4.00"
multi(0)disk ....\WINNT40="Windows NT Version 4.00 [UNIHAL]"
/hal=unihal.dll /kernel=unikrnl.exe
NOTE: Do not wrap the second line.
- Save the Boot.ini file, quit the text editor, and then restart your
computer.
- Choose Windows NT Version 4.00 [UNIHAL] from the Windows NT boot menu.
- In Windows NT, run the Winmsd.exe tool to view the correct IRQs for
PCI devices.
STATUS
Microsoft has confirmed this to be a problem in Microsoft Windows NT
version 3.5, 3.51, and 4.0.
MORE INFORMATION
MPS is a specification used by computer manufacturers to design and build
Intel-based computers with multiple processors.
Additional query words:
PCI bridge device
Keywords : kbsetup ntsetup NTSrvWkst
Version : WINDOWS:2000; winnt:3.5,3.51,4.0
Platform : WINDOWS winnt
Issue type : kbprb