linux-kernel - Re: [PATCH 4/8] x86 boot: allow overlapping ebda and efi memmap memory ranges

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Message-Id: <1213607659.13629.0.camel@caritas-dev.intel.com>
Date:	Mon, 16 Jun 2008 17:14:19 +0800
From:	"Huang, Ying" <ying.huang@...el.com>
To:	Paul Jackson <pj@....com>
Cc:	mingo@...e.hu, tglx@...utronix.de, yhlu.kernel@...il.com,
	steiner@....com, travis@....com, hpa@...or.com,
	linux-kernel@...r.kernel.org, andi@...stfloor.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 4/8] x86 boot: allow overlapping ebda and efi memmap
	memory ranges

On Mon, 2008-06-16 at 04:09 -0500, Paul Jackson wrote:
> Huang wrote:
> > 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.
> 
> That might work -- I'll give it a try.
> 
> > I think if EBDA area is used in EFI system, it should be reserved in EFI
> > memory map.
> 
> Would you recommend doing this with code in arch/x86/kernel/head.c,
> that did not invoke reserve_ebda_region() if efi_enabled was set?

Yes.

Best Regards,
Huang Ying
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