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Date: Tue, 10 Oct 2006 10:34:32 +1000
From: Antony Mawer <fbsd-questions@mawer.org>
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To: Juha Saarinen <juhasaarinen@gmail.com>
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Cc: FreeBSD questions <freebsd-questions@freebsd.org>
Subject: Re: AHCI support in 6.1-RELEASE?
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On 10/10/2006 10:18 AM, Juha Saarinen wrote:
> Hmm... ata-chipset.c says there is AHCI support.
> 
> #include <sys/cdefs.h>
> __FBSDID("$FreeBSD: src/sys/dev/ata/ata-chipset.c,v 1.126.2.11 
> 2006/03/16 21:28:
> 51 sos Exp $");
> 
> If so, what could be the reason for FreeBSD not finding the SATA hard
> disk in the system in AHCI mode?

Most likely this renumbers the drivers, so you go from your hard drive 
showing as eg. ad0 to ad4. You will need to edit /etc/fstab as 
appropriate to match what the drive is showing up as after changing to 
AHCI mode.