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Enabling the HS200 feature for eMMC

Last Updated: 12/12/2016

You can configure the device to enable the HS200 feature for eMMC parts. This eMMC feature delivers a theoretical throughput of 200 MB/s across the eMMC bus, using a 200 MHz single data rate clock with an 8-bit bus width. This can result in significant performance improvements, especially on higher-end eMMC parts.

Constraints: ImageTimeOnly

Instructions:

  1. Create a customization answer file using the contents shown in the following code sample.

    <?xml version="1.0" encoding="utf-8" ?>  
    
    <ImageCustomizations xmlns="http://schemas.microsoft.com/embedded/2004/10/ImageUpdate"  
                         Name="HS200"  
                         Description="Use to enable the HS200 eMMC feature."  
                         Owner=""  
                         OwnerType="OEM"> 
    
      <Static>  
        <Settings Path="Storage/SdBus/MainOS">  
          <Setting Name="DisableHS200Support" Value="" />   
        </Settings>  
      </Static>
    
    </ImageCustomizations>
    
  2. Specify an Owner value in the customization answer file.

  3. Set the Value to one of the following:

    ValueDescription

    0

    Enable the HS200 feature.

    1

    Disable the HS200 feature. This is the default value.

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