linux-kernel - Re: [PATCH 5/5] x86_64 EFI support -v3: EFI document

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Date:	Wed, 8 Aug 2007 12:08:00 +0200
From:	Andi Kleen <ak@...e.de>
To:	"Huang, Ying" <ying.huang@...el.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	akpm@...ux-foundation.org, Yinghai Lu <yhlu.kernel@...il.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Chandramouli Narayanan <mouli@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] x86_64 EFI support -v3: EFI document


> The needed code changing is minimal. In fact, I can boot 32bit Linux
> kernel on my x86_64 EFI machine. With setup as follow:
>
> 1. Apply the efi-fb.patch
Just for the frame buffer, right?

> 2. make efi fb driver not depend on EFI
> 3. configure kernel as follow:
>    a. CONFIG_EFI is turned off
>    b. CONFIG_FB_EFI is turned on

Hmm, how does the 32bit kernel know where the e820 map is passed then?
With CONFIG_EFI turned off it will just ask the real mode BIOS I think
and I doubt elilo simulates that.

Or did you apply more patches?

-Andi
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