Re: [PATCH 4/8] x86 boot: allow overlapping ebda and efi memmap memoryranges

[H. Peter Anvin]

Paul Jackson wrote:
> Yinghai wrote:
> > like to see to make reserve_ebda_region() more smart like the old
> > way when andi introduced ebda_size... instead of reserve 0x9000 to
> > 0x100000 all the way.
>
> Looking back at some older kernels, that code seems to have setup an
> ebda region only if there was a non-zero real mode pointer at 0x40E.
>
> This is rather different than always setting up such a region.

Well, sort of.  Only some very old systems will not have had one.

0x40E contains the pointer to the EBDA; this basically tests for the 
existence of an EBDA at all.

	-hpa

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