Draft: Add LLC bypass region for Carfield #176
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CyrilKoe
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The region at [0x2_8000_0000 ; 0x3_0000_0000[ can be used to bypass the LLC when the LLC is enabled.
This is useful to speedup device DMA when LLC is enabled (of course requires managing LLC flushes in software).
Note that the LLC already has an AXI demux - mux which bypasses the LLC by default. Thus there is no need to change anything in the LLC or its internal address map.