Remove Smaiae extension #622 #640
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The AIA spec describes a minimal implementation of mvip and mvien, which does not carry a significant area penalty. The Smaiae section is removed, and a Smaclic/Ssaclic section "Area impact of AIA features" explains how area can be reduced when needed.
christian-herber-nxp
requested changes
Oct 21, 2025
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| == Advanced Core Local Interrupt Controller (Smaclic and Ssaclic) | ||
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| The Smaclic and Ssaclic extensions depend on the Smaiae extension. |
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This needs to be removed.
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Instead, dependence on indirect CSR needs to be added.
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As described in #622 there is no need for explicit Smaiae and Ssaia extensions because ACLIC extension can be based directly on AIA - there is no need to delete AIA features. AIA provides sufficient scope for area-reduction on resource-constrained systems, e.g. by reducing the number of IPRIO bits (possibly to zero), and by recommending a minimal implementation of mvip.
A note has been added, pointing readers to parts of the AIA spec that assist with area reduction.