In MMIO_AXI4_Adapter.bsv, added check for unmapped addresses, provide err response immediately.
Previously, the request went out into the fabric, and we were relying on the fabric returning an error response. Some fabrics don't do this reliably, so this removes that reliance on the fabric.
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@@ -1,5 +1,6 @@
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// Copyright (c) 2018 Massachusetts Institute of Technology
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// Portions copyright (c) 2019-2020 Bluespec, Inc.
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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