PRB: Device Installation Conflict -- In Use by Unknown Device
PSS ID Number: 163362
Article Last Modified on 10/24/2002
The information in this article applies to:
- Microsoft Win32 Device Driver Kit (DDK) Windows 95
This article was previously published under Q163362
SYMPTOMS
When you install a device on Windows 95, the installation may fail because
of a resource conflict indicating that the I/O region is "In use by unknown
device."
CAUSE
Windows 95 traps I/O accesses from ring3 code. If an I/O access occurs for
an address that is not associated with any previously installed device,
Windows 95 marks this I/O region as "In use by unknown device" in Device
Manager.
You may cause this problem if you have ring3 code that accesses your device
prior to actually installing the device (such as for detection purposes).
RESOLUTION
If you need to access your device prior to installation you can avoid
having the I/O accesses trapped by performing them from a VxD.
Additional query words: 4.00 KBDSupport kbdsh
Keywords: kbprb kbProgramming KB163362
Technology: kbAudDeveloper kbWin32DDK95 kbWin32DDKSearch kbWin32sSearch kbWin95search kbWinDDKSearch