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Introduction
== Introduction ==
Beacause Because of widely available Internet connectivity, nowadays security concerns are not longer limited to PCs, servers and workstations but have become common to many embedded systems as well. To deal with this kind of challenges, several hardware and software technologies have been developed. [http://www.arm.com/products/processors/technologies/trustzone/ ARM® TrustZone® technology] is one of these. As stated in <ref name="WP429">Yashu Gosain and Prushothaman Palanichamy, ''Xilinx WP429 - TrustZone Technology Support in Zynq-7000 All Programmable SoCs (v1.0)'', May 20, 2014</ref>, Xilinx Zynq-7000 AP SoC natively supports [http://www.arm.com/products/processors/technologies/trustzone/ TrustZone® technology], since it integrates dual-core ARM® Cortex™-A9 MPCore™ processor.
Even if this technology has been conceived primarily to address security issues, embedded systems designers can leverage it to implement innovative configurations, satisfying different in nature requirements that typically arise in industrial applications and deep embedded systems{{efn|These kind of requirements are often totally independent of Internet connectivity}}. Two of such requirements are real-timeness and system integrity{{efn|In this context, for the terms '''integrity''' and '''security''' the definitions provided by <ref name="WP461">Ed Hallett, Giulio Corradi, Steven McNeil, ''Xilinx WP461 - Xilinx Reduces Risk and Increases Efficiency for IEC61508 and ISO26262 Certified Safety Applications (v1.0)'', April 9, 2015</ref> are in use:
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