Re: [PATCH] libata: add enclosure management support

[James Bottomley <James.Bottomley@HansenPartnership.com>]

On Fri, 2008-01-18 at 16:35 -0800, Kristen Carlson Accardi wrote:
> > Unfortunately, all the dual SAS/SATA enclosures seem to be coming with
> > either SGPIO devices or full fledged SES-2 devices.  I've actually got
> > both (a backplane with SGPIO and an internal SAS/SATA enclosure with
> > SES-2).  Unfortunately, I don't have the necessary information to
> > drive the SGPIO one ... it's connected directly to an aix94xx using
> > the mini4i SGPIO signals ... I think aic94xx can drive them, we just
> > don't have the programming information.  The other is a standard
> > SES-2 device, which I think I might be able to get working.
> > 
> 
> Having documentation would be pretty helpful :).  I know for ICH8, if
> you read the docs it says that it supports SGPIO as well.  But then you
> realize it supports SGPIO via the LED protocol, wired up to translate
> LED to SGPIO via hardware.  But, even if it did support straight SGPIO,
> this design can accommodate that.  Can we see the documentation for the
> SES-2 device?

Yes, sure; SES-2 is here (usual place, since it's a SCSI standard):

http://www.t10.org/ftp/t10/drafts/ses2/ses2r19a.pdf

SGPIO is more convoluted.  The canonical link is
http://www.sffcommittee.com/ but that just seems to send you back to
seagate.  The actual standard is this one:

ftp://ftp.seagate.com/sff/SFF-8485.PDF

James