Re: PIIX libata ?

Re: PIIX libata ?

[Dominic ES. Ijichi]

----- Randy.Dunlap <rdunlap@xenotime.net> wrote:
> On Tue, 18 Apr 2006 13:59:05 +0000 (UTC) Frido Ferdinand wrote:
> 
> > Hi,
> > 
> > How can i see that PIIX is either from libata or the usual IDE
> drivers. I have
> > both enabled in the kernel but not sure which takes presedence, will
> the drives
> > show up as /dev/sda ? disks used are non-sata/normal ide disks.
> 
> If both are built into the kernel (=y and not modules), legacy
> IDE drivers take precedence since ide/ is ahead of scsi/ in
> drivers/Makefile (libata drivers are in scsi/).
> 
> I have no idea about precedence if you are using initrd or initramfs.
> 
> And if legacy ide and scsi are both modules, you won't boot...
> (without using initrd or initramfs).

if I have both ahci and ata_piix modules in initrd (as is the case in most distros), is there any way of passing a parameter to the kernel to tell it which one i want?  ahci seems to take preference on my ICH6M but the ata_piix module works better.

dom

> 
> ---
> ~Randy
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Re: PIIX libata ?

[Randy.Dunlap]

On Wed, 19 Apr 2006 10:48:26 +0100 (BST) Dominic ES. Ijichi wrote:

> 
> ----- Randy.Dunlap <rdunlap@xenotime.net> wrote:
> > On Tue, 18 Apr 2006 13:59:05 +0000 (UTC) Frido Ferdinand wrote:
> > 
> > > Hi,
> > > 
> > > How can i see that PIIX is either from libata or the usual IDE
> > drivers. I have
> > > both enabled in the kernel but not sure which takes presedence, will
> > the drives
> > > show up as /dev/sda ? disks used are non-sata/normal ide disks.
> > 
> > If both are built into the kernel (=y and not modules), legacy
> > IDE drivers take precedence since ide/ is ahead of scsi/ in
> > drivers/Makefile (libata drivers are in scsi/).
> > 
> > I have no idea about precedence if you are using initrd or initramfs.
> > 
> > And if legacy ide and scsi are both modules, you won't boot...
> > (without using initrd or initramfs).
> 
> if I have both ahci and ata_piix modules in initrd (as is the case in most distros), is there any way of passing a parameter to the kernel to tell it which one i want?  ahci seems to take preference on my ICH6M but the ata_piix module works better.

combined_mode ?  from Documentation/kernel-parameters.txt:

	combined_mode=	[HW] control which driver uses IDE ports in combined
			mode: legacy IDE driver, libata, or both
			(in the libata case, libata.atapi_enabled=1 may be
			useful as well).  Note that using the ide or libata
			options may affect your device naming (e.g. by
			changing hdc to sdb).
			Format: combined (default), ide, or libata


---
~Randy

PIIX libata ?

[Frido Ferdinand]

Hi,

How can i see that PIIX is either from libata or the usual IDE drivers. I have
both enabled in the kernel but not sure which takes presedence, will the drives
show up as /dev/sda ? disks used are non-sata/normal ide disks.

Regards,

Frido

Re: PIIX libata ?

[Randy.Dunlap]

On Tue, 18 Apr 2006 13:59:05 +0000 (UTC) Frido Ferdinand wrote:

> Hi,
> 
> How can i see that PIIX is either from libata or the usual IDE drivers. I have
> both enabled in the kernel but not sure which takes presedence, will the drives
> show up as /dev/sda ? disks used are non-sata/normal ide disks.

If both are built into the kernel (=y and not modules), legacy
IDE drivers take precedence since ide/ is ahead of scsi/ in
drivers/Makefile (libata drivers are in scsi/).

I have no idea about precedence if you are using initrd or initramfs.

And if legacy ide and scsi are both modules, you won't boot...
(without using initrd or initramfs).

---
~Randy