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Recent changes to the arm64 MMU code mean that you can no longer map R/O memory as R/W. Mapping R/W memory now causes a cache invalidation instruction (DC IVAC) that requires write permissions or else a fault is generated. Modify ivshmem-v2 to map each R/O and R/W section individually Signed-off-by: Grant Ramsay <gramsay@enphaseenergy.com>