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From: Volker Armin Hemmann <volkerarmin@googlemail.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] AHCI/IDE-question
Date: Fri, 21 Jan 2011 20:16:35 +0100
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On Friday 21 January 2011 11:08:39 Mark Knecht wrote:
> On Fri, Jan 21, 2011 at 10:45 AM, <meino.cramer@gmx.de> wrote:
> > Hi,
> >
> > I got a little confused about the sense or nonsense of AHCI vs. IDE.
> >
> > I run a ASUS Crosshair IV Formula, which BIOS has a menu entry to
> > configure the SATA ports either for IDE or AHCI or RAID. Forget RAID
> > for a momen -- I dont use it (nothing against RAID ! ;)
> >
> > My box uses a linux 2.6.37 vanilla kernel.
> >
> > The kernel config has been set to
> >
> > CONFIG_SATA_AHCI=y
> > # CONFIG_SATA_AHCI_PLATFORM is not set
> >
> > In the dmesg output I found this:
> >
> > pci 0000:00:11.0: set SATA to AHCI mode
> > ahci 0000:00:11.0: AHCI 0001.0200 32 slots 4 ports 3 Gbps 0xf impl
> > SATA mode ahci 0000:07:00.0: AHCI 0001.0000 32 slots 2 ports 3 Gbps 0x3
> > impl SATA mode
> >
> > despite the fact that AHCI is disabled in the BIOS settings (using
> > IDE).
> >
> > I did an experiment an disabled AHCI in the kernel (to make the kernel
> > settings consistent with the BIOS.)
> >
> > Result: The kernel did not find the root partition.
> >
> > In the meanwhile I do not understand all this never more.
> >
> > Why does the kernel boots only, if the BIOS says "IDE!" and linux
> > insists on "AHCI!"...and waht ist the result?
> >
> > Best regards,
> > mcc
>
> Hi meino,
> It's disappointing that Volker insists on sending these pissy
> little responses which don't advance the conversation. Sorry for that.
>
> Not sure I can lend any weight to the argument but it's my belief
> that your installation of Gentoo Linux isn't using BIOS to access the
> disk at all. Once the system boots and loads the kernel, then the
> kernel loads drivers (or uses what you built into the kernel) and
> takes over control of the hardware using the AHCI drivers. If the
> kernel doesn't use BIOS disk calls (INT13?) then it doesn't care what
> the BIOS thinks because the BIOS is not longer involved. It just talks
> directly to the hardware.
>
> I'm happy to be corrected (by Volker I'm sure) but that's my guess
> as to what you're seeing.
you are confusing bios calls and bios programming chips as.... also - is there
any good reason to use IDE mode? Any? At all?