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When configured with 4GiB DRAM size, only 3.8GiB is available, the I/O beeing mapped in the last 256MiB of the first 4GiB physical memory/ First fixup the mm_region to handle the first 3.8GiB as memory and the last 256MiB as I/O. Then limit the real memory reported by the firmware to the available physical space, 3.8GiB aligned with the mm_region memory zone size. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Tested-by: Mark Kettenis <kettenis@openbsd.org>