[CentOS] AHCI at boot?

Gordon McLellan gordonthree at gmail.com
Sun Dec 21 14:23:09 UTC 2008


Thank you Joseph, that did the trick!  After studying the man page for
mkinitrd, I also used --preload ahci to make sure the ahci driver was
the first one to look for drives.

My steps (for future reference):

1) Switch bios back to "legacy" sata mode
2) update modprobe.conf adding a scsi line for the ahci module
3) mkinitrd --preload ahci etc etc..
4) reboot, switch bios to ahci mode
5) system booted just fine!

-Gordon

On Sat, Dec 20, 2008 at 11:35 AM, Joseph L. Casale
<JCasale at activenetwerx.com> wrote:
>>So I'm wondering what config files I need to tweak, to help the
>>already installed system use the "new" ahci controller?  Previously,
>>it appears to have been using the piix module to access the drive with
>>the root fs on it.
>
> So, you need modprobe.conf to reflect this as well as a new initrd.
> On a similar system I have from Asus my modprobe.conf looks like this:
>
> alias scsi_hostadapter ata_piix
> alias scsi_hostadapter1 ahci
>
> I assume the ata_piix is still required for the jmicron ide controller.
> After editing this, run mkinitrd which will look there and then load the
> required modules.
>
> HTH,
> jlc
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