Messages in this thread |  | | Subject | Re: [PATCH 4/8] x86 boot: allow overlapping ebda and efi memmap memory ranges | From | "Huang, Ying" <> | Date | Mon, 16 Jun 2008 16:53:55 +0800 |
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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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