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Boot Camp question: BIOS emulation


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Boot Camp question: BIOS emulation
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BlueApple
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Join Date: Jun 2006
 
2006-10-27, 05:56

I know that Boot Camp enables BIOS emulation, my question is, does this BIOS emulation running all the time during the Win XP session, or does it only run to boot the Win XP?
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chucker
 
Join Date: May 2004
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2006-10-27, 06:10

The emulation doesn't have a performance impact, if that's what you're asking. It gives Windows (and virtually any non-EFI-compatible system) interfaces that those systems would expect from a typical ACPI BIOS. That is, it makes the EFI firmware appears as if it were an ACPI BIOS firmware. For example, in order to put the machine on stand-by (sleep), the systems use ACPI commands, and the emulation as part of the Boot Camp firmware translate those commands on-the-fly to EFI equivalents.

That's really all there is to it. It's a bridge. In that sense, it's not "native", but it really doesn't matter.
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