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The iris CPU model doesn't necessarily know the best way to send functional packets (what port? what type is that port?), but only has a generic sc_module pointer to the EVS and so can't call specialized methods on it. There also isn't any common base class for EVSes to cast into in a generic way. This attribute mechanism lets the EVS set up its own sendFunctional implementation however it needs to using facilities that are built into generic sc_objects. Change-Id: I69bf364908c2a5360bd6ce7d3e49ce67c6f771b0 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/21046 Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>