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    SubjectRe: [PATCH 4/8] x86 boot: allow overlapping ebda and efi memmap memory ranges
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    On Mon, 2008-06-16 at 03:24 -0500, Paul Jackson wrote:
    > Huang wrote:
    > > I think it is better to change boot loader to avoid memory area of EBDA.
    >
    > Would this require the bootloader to know the kernels rather arbitrary
    > heuristics for inventing and placing an EBDA area, in reserve_ebda_region()?

    I think it is sufficient for boot loader to avoid memory area from
    0x9f000 to 0x100000. This can be seen as compatible code for legacy
    BIOS.

    > In general, I would think it better not to have to code into the EFI
    > firmware or bootloader such knowledge. But perhaps I am wrong here.
    >
    > If the kernel is going to reserve an EBDA region even if no EBDA is
    > requested by the BIOS, then I would think that the kernel should be
    > more tolerant of BIOS's that put something else in that place.
    >
    > > Or do not reserve EBDA on EFI system.
    >
    > I suppose. This would have been a bigger change than I could
    > suggest. For all I know, there are existing systems using EBDA
    > and EFI together. Would this change break them?
    >
    > If you have good reason to know that's essentially impossible then
    > I have no objections, so far as my needs go, to not reserving EBDA
    > on EFI systems.

    I think if EBDA area is used in EFI system, it should be reserved in EFI
    memory map.

    Best Regards,
    Huang Ying



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