52 lines
1.8 KiB
ReStructuredText
52 lines
1.8 KiB
ReStructuredText
.. _faq:
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Frequently Asked Questions
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##########################
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Here are some frequently asked questions about the ACRN project.
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.. contents::
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:local:
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:backlinks: entry
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What Hardware Does ACRN Support?
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********************************
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ACRN runs on Intel-based boards, as documented in
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our :ref:`hardware` documentation.
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.. _config_32GB_memory:
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How Do I Configure ACRN's Memory Size?
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**************************************
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It's important that the ACRN configuration settings are aligned with the
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physical memory on your platform. Check the documentation for these
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option settings for details:
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* :option:`hv.MEMORY.PLATFORM_RAM_SIZE`
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* :option:`hv.MEMORY.SOS_RAM_SIZE`
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* :option:`hv.MEMORY.UOS_RAM_SIZE`
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* :option:`hv.MEMORY.HV_RAM_SIZE`
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Check the :ref:`acrn_configuration_tool` for more information on how
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to adjust these settings.
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Why Does ACRN Need to Know How Much RAM the System Has?
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*******************************************************
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Configuring ACRN at compile time with the system RAM size is a tradeoff between
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flexibility and functional safety certification. For server virtualization, one
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binary is typically used for all platforms with flexible configuration options
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given at run time. But, for IoT applications, the image is typically configured
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and built for a particular product platform and optimized for that product.
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Important features for ACRN include Functional Safety (FuSa) and real-time
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behavior. FuSa requires a static allocation policy to avoid the potential of
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dynamic allocation failures. Real-time applications similarly benefit from
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static memory allocation. This is why ACRN removed all ``malloc()``-type code,
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and why it needs to pre-identify the size of all buffers and structures used in
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the Virtual Memory Manager. For this reason, knowing the available RAM size at
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compile time is necessary to statically allocate memory usage.
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