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typically memory mapped bus, for example on the AMD Opteron A1100 the AHCI device is mapped in the CPUs address space, and not through a PCI controller. Further work is needed for this to work with ACPI as this is expected to be common on ARMv8 servers. Reviewed by: mav, mmel Obtained from: mmel, ABT Systems Ltd Relnotes: yes Sponsored by: SoftIron Inc Differential Revision: https://reviews.freebsd.org/D4269