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Summary: Kernel maps only one page of FDT. When FDT is more than one page in size, data TLB miss occurs on memmove() when FDT is moved to kernel storage (sys/powerpc/booke/booke_machdep.c, booke_init()) This introduces a pmap_early_io_unmap() to complement pmap_early_io_map(), which can be used for any early I/O mapping, but currently is only used when mapping the fdt. Submitted by: Ivan Krivonos <int0dster_gmail.com> Differential Revision: https://reviews.freebsd.org/D7605