[Server-devel] Suggested SATA change by Marvell
wmb at laptop.org
Fri Jun 29 15:26:06 EDT 2007
I don't have enough direct experience with any of the proposed solutions
to have a preference.
John Watlington wrote:
> Marvell has been pushing hard for a change in the SATA subsystem.
> Currently, this is planned to be:
> A.) A SATA interface on the Discovery 6 (MV-64660), and
> a SATA interface on an 88SE6111, connected to the Discovery 6 through
> The proposal from Marvell is to move to either:
> B.) A Port Multiplier (88SM4140) connected to the SATA interface on
> the Discovery 6,
> which supports up to four SATA ports, or
> C.) Two SATA interfaces on an 88SE6121, connected to the Discovery 6
> through PCI-E
> The main reason seems to be to move us to a single driver.
> Pricing on either of these solutions would be higher (but not in our
> case: Marvell will
> sell us any of these three solution for the same price.)
> Power will be roughly equivalent, as the PCI-E PHY will always be
> turned on in solutions
> A and C, and B requires two SATA hops.
> So it comes down to software/driver costs.
> Work is being done by Marvell to ensure 88SE61xx family support in
> libata. The Port Multiplier
> isn't well supported by libata at this time.
> The SATA interface on the Discovery 6 is very similar to the Hercules
> SATA chipset, currently
> supported by the open source mrvlsat driver (?) and is also being
> included in libata (but not
> as fast as the 88SE61xx support).
> An internal driver for the Discovery 6 SATA, including PM support, has
> been shipping for over
> three years. We will have that code dropped off this afternoon.
> Comments ? Suggestions ?
More information about the Server-devel