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[prefix] Use flat real mode for access to high memory
Use flat real mode rather than 16-bit protected mode for access to high memory during installation. This simplifies the code by reducing the number of CPU modes we need to think about, and also increases the amount of code in common between the normal and (somewhat hypothetical) KEEP_IT_REAL methods of operation. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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