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    SubjectRe: [PATCH 08/12] SFI, x86: hook e820() for memory map initialization
    Feng Tang wrote:
    > Hi hpa,
    > I understand your concern, and I've added that code into our boot loader
    > for Moosrestown which sets up a e820 memory table in boot parameters by
    > parsing SFI table.
    > The reason we still keep this piece of code is to be compatible with old
    > version boot loaders which may not know SFI info yet. And
    > sfi_init_memory_map() only get called when kernel can't find an e820 table
    > in boot parameters.
    > Anyway, I think we can remove the code if it really breaks the rule.
    > Thanks,
    > Feng

    What I'm concerned about is that we will want to be able to use the
    range allocator, which relies on the e820 memory map, extremely early
    during boot. In the EFI case, we allow (*optionally*) to fill in
    additional information from the EFI map after initial boot, but we still
    require memory ranges in the initial map (they can, however, be a subset
    of the available memory.)

    I'm really concerned about saying "well, it works now" and tying
    ourselves into an interface that we cannot support in the long term
    (read: we'll be stuck with it.)


    H. Peter Anvin, Intel Open Source Technology Center
    I work for Intel. I don't speak on their behalf.

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