On Fri, 2008-01-18 at 16:55 -0800, Kristen Carlson Accardi wrote: > On Fri, 18 Jan 2008 18:47:18 -0600 > James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> wrote: > > > 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 > > > > > > 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. OK, now I'm confused. A SES-2 device is a SCSI device. The standard defines everything for them. They sit on the bus like any other SCSI device. SGPIO is a separate bus; it's also fully defined in SFF-8485, so my SFF-8485 compliant backplane should be fully defined by the spec as well. If you're asking how the SGPIO transciever in the aic94xx works, that's the piece I don't know ... it's not in the RAZOR spec. James - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
