linux-kernel - Re: [PATCH[RFC] Quirk macbook pro 6,2 into ahci mode

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Message-ID: <4C44741D.5010409@fusionio.com>
Date:	Mon, 19 Jul 2010 09:49:49 -0600
From:	Jens Axboe <jaxboe@...ionio.com>
To:	Tino Keitel <tino.keitel@...ei.de>
CC:	Matthew Garrett <mjg59@...f.ucam.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>,
	"jgarzik@...ox.com" <jgarzik@...ox.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [PATCH[RFC] Quirk macbook pro 6,2 into ahci mode

On 07/18/2010 11:40 PM, Tino Keitel wrote:
> On Sun, Jul 18, 2010 at 14:34:46 -0600, Jens Axboe wrote:
> 
> [...]
> 
>> See this is where I'm getting confused, since I'm not entirely sure what
>> the boot process is. If I boot a DVD directly, then it's in piix mode.
>> Booting through refit -> Linux, it's in piix mode. So my logic was that
>> it is probably getting switched into ahci mode by the OSX boot loader or
>> perhaps the driver does it there.
> 
> If this helps: I switched from grub-pc to grub-efi on my oldish Mac
> mini Core 2 Duo (i945 chipset) and the hard disk used AHCI after this.
> Suspend also works fine. So I would guess that the AHCI/PIIX difference
> is caused by booting with EFI/legacy DOS bootblock, and the latter is
> just done for Windows compatibility.

Great! That sounds way better. DO you have a pointer to grub-efi? I'm
finding some grub2 efi stuff with google, just want to make sure that is
it. A grub 0.9x with efi would be preferable, I find grub2 to be horrible
to work with in general...

-- 
Jens Axboe

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