I'm using the following settings on my FPGA board:

object MyFPGASettings {
  def apply() = Map(
    "NrExtIntr" -> 3,
    "ResetVector" -> 0x10000000L,
    "MMIOBase" -> 0x0000000080000000L,
    "MMIOSize" -> 0x0000000080000000L
  )
}

This makes 0x80000000-0xffffffff MMIO address space and I can use 0x40000000-0x7fffffff as memory address space.

However, when I try to access memory at 0x7fffffc0, the system hangs up . I wonder if this memory access will trigger Prefetcher to prefetch memory at 0x80000000 (but actually in MMIO address space) and thus hang up the entire system?