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hw/npu2.c: Fix device aperture calculation
The POWER9 NPU2 implements an address compression scheme to compress 56-bit P9 physical addresses to 47-bit GPU addresses. System software needs to know both addresses, unfortunately the calculation of the compressed address was incorrect. Fix it here. Signed-off-by: Alistair Popple <alistair@popple.id.au> Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
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