Re: [PATCH 0/2]ACPI support for SATA/PATA

["zhao, forrest" <forrest.zhao@intel.com>]

On Wed, 2006-07-26 at 11:14 -0400, Mark Lord wrote:
> zhao, forrest wrote:
> > Hello, all
> > 
> > In ACPI spec 3.0, section 9.9 defines 4 objects for PATA/SATA:
> > 
> > _GTF is for both PATA and SATA, which is used to return ATA task file
> > needed to re-init the drive;
> > _SDD is SATA-only object, which is used to inform the platform of the
> > type of device attached to a port;
> > _GTM and _STM are PATA-only objects, which are used to get/set PATA
> > timing information(i.e. PIO and DMA speed).
> 
> It seems to be quite common for ICH*M notebooks to use the SATA ports
> to attach PATA drives with PATA->SATA bridge chips in the middle.
> 
> In this case, one would expect the _GTM and _STM objects to be necessary,
> even though Linux thinks it's a SATA situation.
> 

Hi Mark,

I re-read the section 9.9 of ACPI spec 3.0, but didn't find any
description about how to deal with "PATA->SATA bridge". Is this version
of APCI spec outdated?
Would you please point me to spec(or document), which has the
description of how to deal with "PATA->SATA bridge"?

Thanks,
Forrest