On Fri, 18 Jan 2008 18:47:18 -0600
James Bottomley [off-list ref] wrote:

On Fri, 2008-01-18 at 16:35 -0800, Kristen Carlson Accardi wrote:

quoted

quoted

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

No, I meant for the actual device.  The specs don't help all that much
in the area of actually transmitting the messages at the driver level -
at least they don't for AHCI.