# LCP-DARE and debugging documentation

Last Level Cache Controller Co-Processor DRAM Authentication Replay-Protection Encryption (LCP-DARE) protects double data rate (DDR) memory on Snapdragon^®^ X2 Linux Mobile PC platforms. Use the following sections to learn how LCP-DARE works, configure protected DRAM regions with the Qualcomm DDR USB test tool (QDUTT), verify the configuration on a device, and debug authentication errors.

Start with the overview to learn what LCP-DARE protects, then follow the configuration, debugging, and performance sections based on your task.

## Get started

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</svg> LCP-DARE overview

Learn about LCP-DARE features, protection modes, and how it compares to pseudo internal memory (pIMEM).

https://docs.qualcomm.com/doc/80-A0399-49/topic/lcp-dare-overview.html#lcp-dare-overview

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</svg> LCP-DARE architecture

Learn about the protection modes, algorithms, region layout, and boot-time configuration flow.

https://docs.qualcomm.com/doc/80-A0399-49/topic/lcp-dare-architecture.html#lcp-dare-architecture

## Configure LCP-DARE

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  <path d="M8 2V14M3.33333 2H12.6667C13.403 2 14 2.59695 14 3.33333V12.6667C14 13.403 13.403 14 12.6667 14H3.33333C2.59695 14 2 13.403 2 12.6667V3.33333C2 2.59695 2.59695 2 3.33333 2Z" stroke="#2A2AEA" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"></path>
</svg> Get started with LCP-DARE configuration

Review prerequisites and the end-to-end path to configure and verify a region.

https://docs.qualcomm.com/doc/80-A0399-49/topic/get-started-with-lcp-dare-configuration.html#get-started-with-lcp-dare-configuration

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  <path d="M8 2V14M3.33333 2H12.6667C13.403 2 14 2.59695 14 3.33333V12.6667C14 13.403 13.403 14 12.6667 14H3.33333C2.59695 14 2 13.403 2 12.6667V3.33333C2 2.59695 2.59695 2 3.33333 2Z" stroke="#2A2AEA" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"></path>
</svg> Configure LCP-DARE regions with QDUTT

Set protection modes and region sizes, then generate and flash the configuration.

https://docs.qualcomm.com/doc/80-A0399-49/topic/configure-lcp-dare-regions-with-qdutt.html#configure-lcp-dare-regions-with-qdutt

## Debug LCP-DARE errors

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  <path d="M8 2V14M3.33333 2H12.6667C13.403 2 14 2.59695 14 3.33333V12.6667C14 13.403 13.403 14 12.6667 14H3.33333C2.59695 14 2 13.403 2 12.6667V3.33333C2 2.59695 2.59695 2 3.33333 2Z" stroke="#2A2AEA" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"></path>
</svg> Debug LCP-DARE authentication errors

Capture syndrome information and read the authentication error log registers.

https://docs.qualcomm.com/doc/80-A0399-49/topic/debug-lcp-dare-authentication-errors.html#debug-lcp-dare-authentication-errors

## Review measured performance

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</svg> Assess total memory encryption performance

Review the measured performance impact across graphics, video, camera, and neural processing.

https://docs.qualcomm.com/doc/80-A0399-49/topic/assess-total-memory-encryption-performance.html#assess-total-memory-encryption-performance

Last Published: Sep 08, 2026

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LCP-DARE overview](https://docs.qualcomm.com/bundle/publicresource/80-A0399-49/topics/lcp-dare-overview.md)