You receive a "Prefetch Abort" exception when you attach the Just-In-Time debugger to debug a managed application on a Windows Embedded CE 6.0 R2-based device that has the .NET Compact Framework 3.5 installed


Consider the following scenario, you have a Microsoft Windows Embedded CE 6.0 R2-based device that uses an ARM processor and that has the Microsoft .NET Compact Framework 3.5 installed. You attach the Just-In-Time (JIT) debugger to debug a managed application on the device. In this scenario, you receive a "Prefetch Abort" exception.


This problem occurs if the managed application's memory usage exceeds 32 MB. In this situation, the computed offset targets an incorrect branch of code to handle the breakpoints.


Software update information

A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.


This update is supported only if all previously issued updates for this product have also been installed.

Restart requirement

You do not have to restart the device after you apply this software update.

Update replacement information

This update does not replace any other updates.

File information

The English version of this software update package 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 item in Control Panel.

File nameFile sizeDateTime
Netcfv35.wce.armv4.cab9,310,609 26-Mar-200905:08


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

After you install the update, the JITCodeBufferSizeLimitEnabled registry entry is added under the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETCompactFramework registry subkey. The registry type is DWORD. When the value of the entry is set to 1, the application memory is limited to 32 MB.

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates

Article ID: 973905 - Last Review: Feb 16, 2017 - Revision: 2