Re: [PATCH] ata: Add Intel SCH PATA support

[Alek Du <alek.du@intel.com>]

Alan,

One problem I still do not understand, if I return PATA_UNK for cable detection result, could the
driver finally set the disk to UDMA5 mode if I plug in 80 wire disk?

Thanks,
Alek

On Sun, 27 Apr 2008 09:34:34 +0100
Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:

> > > PATA_80 means "controller *knows* we are 80 wire". PATA_UNK means
> > > "controller can't do detect."
> > 
> > I need to force SCH to use PATA 80 pins to enable UDMA5, just like the way ich_laptop force
> > to use 40 pins.
> 
> What if I plug in a non 80 wire device ?
> 
> > hmmm... for non-sch chipsets, there is no impact, this will only affect sch. You mean
> > I should create a ata_sch.c file instead of patching ata_piix.c ?
> 
> No an sch subtype in the driver just as we have types for ich/piix etc.
>