[coreboot] [Qemu-devel] Release plan for 0.12.0
anthony at codemonkey.ws
Mon Oct 5 15:51:57 CEST 2009
Carl-Daniel Hailfinger wrote:
> What about SeaBIOS + CSM (based on DUET)?
That's not quite the same thing.
In EFI, CSM is a specification that defines how to port a legacy BIOS
such that it runs as basically an EFI module providing the old legacy
BIOS interfaces that OSes support. If you have a set of legacy option
roms and efi modules, it defines how all of those things interact with
each other to provide a consistent experience.
It's is not at all the same as just switching between EFI and BIOS.
It's much more tightly integrated than that.
> I can't speak for Patrick, but he probably was concerned about making
> EFI the default with BIOS as fallback instead of the other way round.
> Forcing any EFI capable (or semi-capable) OS to be booted with EFI
> instead of leaving the choice in the hand of the user (NVRAM) or picking
> the sane default (what almost all boards out there are doing) sounds
> like a non-sustainable way for Qemu.
Why? As long as it Just Works, I don't think it will ever even cross a
>> We'll be stuck with legacy option roms for a long, long time. But I
>> also expect there will be a few devices out there that only provide
>> EFI modules.
> I expect that it will be some time before we see such devices (maybe
> only at trade show demos if at all). It will start to get interesting
> once such EFI modules have to interact with classic option ROMs.
I think at the high end, we'll see these sooner than you think.
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