linux-kernel - Re: Confusions with reserve_early, reserve_bootmem, e820, efi, ... on x86

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Message-Id: <20080612165252.b7ce6902.pj@sgi.com>
Date:	Thu, 12 Jun 2008 16:52:52 -0500
From:	Paul Jackson <pj@....com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	yhlu.kernel@...il.com, andi@...stfloor.org, mingo@...e.hu,
	bwalle@...e.de, hannes@...urebad.de, ying.huang@...el.com,
	linux-kernel@...r.kernel.org, steiner@....com
Subject: Re: Confusions with reserve_early, reserve_bootmem, e820, efi, ...
 on x86_64

hpa writes:
> It's probably safer to reserve the EBDA even with EFI; it's only a page 
> or so so it doesn't matter much.

Reserving EBDA with EFI is fine by what little I know.

But the current code doesn't like it -- if the EFI memmap range is inside
the EBDA range, then the reserve_early() routine panics with:

    "Overlapping early reservations"

Something needs tweaking here somehow ... and I'm not the one to know what.

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@....com> 1.940.382.4214
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