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This adds support for reading the battery-backed memory present on these RTCs. This modifies the read/write methods to access the RAM instead of raw register offsets. No one was using these in-tree, so we should be fine changing them. We use the "standard" address space window to access the RAM. The extension RAM address register has some reserved bits, but we write the whole thing for simplicity (as these bits default to 0). Signed-off-by: Sean Anderson <sean.anderson@seco.com>
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