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

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Message-ID: <20100719054027.GA30246@mac.home>
Date:	Mon, 19 Jul 2010 07:40:27 +0200
From:	Tino Keitel <tino.keitel@...ei.de>
To:	Jens Axboe <jaxboe@...ionio.com>
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 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.

Regards,
Tino
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