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[pcbios] Add additional sanity check for bogus e820 map
At POST time some BIOSes return invalid e820 maps even though they indicate that the data is valid. We add a check that the first region returned by e820 is RAM type and declare the map to be invalid if it is not. This extends the sanity checks from 8b20e5d ("[pcbios] Sanity-check the INT15,e820 and INT15,e801 memory maps").
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