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Using EWF and DUA to field-ⓤpdateWindows XP Embedded devices

  • no.6936
  • 2004-11-12

Windowsfordevices.com Nov.11, 2004

This month`s "Get Embedded" article on Microsoft`s MSDN website explains how to ⓤpdateWindows XP Embedded based devices in the field, using the Enhanced Write Filter (EWF) and the Device ⓤpdateAgent (DUA). EWF is used to write-protect embedded devices, while DUA is a mechanism to "push" individual updates to a device without rebuilding the entire image.

The problem arises when it is necessary to quickly ⓤpdatea write-protected device with, for example, a security hotfix (also known as a "QFE", which stands for "quick-fix engineering"). In the article, Aaron Stebner goes through the end-to-end process of configuring a write-protected embedded image by using EWF, and then rapidly deploying updates to an image by using DUA after it is deployed and running on a device in the field.

Stebner shows how to configure EWF with a RAM overlay and how to ⓢetup DUA to accept QFE patches. He then proceeds to show how the DUAScriptGen "power toy" is used to ⓒreatea DUA to apply a Windows XP Embedded QFE to a device running EWF and DUA without requiring any intervention or access to the devices themselves.