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Some platforms are unable to access the 900h-9ffh region over LPC and must instead access memmap data through the ACPI CMD / DATA ports. To avoid racing with data updates, disallow changes to multi-byte memmap data while in burst mode. Linux currently enables burst mode when accessing multi-byte data and disables it immediately afterward, though the ACPI spec defines burst mode in a more general way. BUG=chrome-os-partner:38224 TEST=Manual on Samus. Undefine LPC_MEMMAP and modify asl to move memmap data to ERAM at offset 0x20. Verify system boots cleanly and battery status is updated immediately on plug / unplug. BRANCH=None Change-Id: Ib848bdb491fdfece96ad0cee7a44ba85b4a1a50b Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/262072 Reviewed-by: Randall Spangler <rspangler@chromium.org> Reviewed-by: Duncan Laurie <dlaurie@chromium.org>