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     mvs — Marvell Serial ATA Host Controller driver


     To compile this driver into the kernel, place the following lines in your kernel
     configuration file:

           device pci
           device scbus
           device mvs

     Alternatively, to load the driver as a module at boot time, place the following line in


     The following tunables are settable from the loader(8):

     controls Message Signaled Interrupts (MSI) usage by the specified controller.

     controls Command Completion Coalescing (CCC) usage by the specified controller.  Non-zero
     value enables CCC and defines maximum time (in us), request can wait for interrupt.  CCC
     reduces number of context switches on systems with many parallel requests, but it can
     decrease disk performance on some workloads due to additional command latency.

     defines number of completed commands for CCC, which trigger interrupt without waiting for
     specified coalescing timeout.

     controls SATA interface Power Management for the specified channel, allowing some power to
     be saved at the cost of additional command latency.  Possible values:

           0     interface Power Management is disabled (default);
           1     device is allowed to initiate PM state change, host is passive;
           4     driver initiates PARTIAL PM state transition 1ms after port becomes idle;
           5     driver initiates SLUMBER PM state transition 125ms after port becomes idle.

     Note that interface Power Management is not compatible with device presence detection.  A
     manual bus reset is needed on device hot-plug.

     setting to nonzero value limits maximum SATA revision (speed).  Values 1, 2 and 3 are
     respectively 1.5, 3 and 6Gbps.


     This driver provides the CAM(4) subsystem with native access to the SATA ports of several
     generations (Gen-I/II/IIe) of Marvell SATA controllers.  Each SATA port found is represented
     to CAM as a separate bus with one target, or, if HBA supports Port Multipliers (Gen-II/IIe),
     16 targets.  Most of the bus-management details are handled by the SATA-specific transport
     of CAM.  Connected ATA disks are handled by the ATA protocol disk peripheral driver ada(4).
     ATAPI devices are handled by the SCSI protocol peripheral drivers cd(4), da(4), sa(4), etc.

     Driver features include support for Serial ATA and ATAPI devices, Port Multipliers
     (including FIS-based switching, when supported), hardware command queues (up to 31 command
     per port), Native Command Queuing, SATA interface Power Management, device hot-plug and
     Message Signaled Interrupts.

     The same hardware is also supported by the atamarvell and ataadaptec drivers from the ata(4)
     subsystem.  If both drivers are loaded at the same time, this one will be given precedence
     as the more functional of the two.


     The mvs driver supports the following controllers:

     Gen-I (SATA 1.5Gbps):
           ·   88SX5040
           ·   88SX5041
           ·   88SX5080
           ·   88SX5081

     Gen-II (SATA 3Gbps, NCQ, PMP):
           ·   88SX6040
           ·   88SX6041 (including Adaptec 1420SA)
           ·   88SX6080
           ·   88SX6081

     Gen-IIe (SATA 3Gbps, NCQ, PMP with FBS):
           ·   88SX6042
           ·   88SX7042 (including Adaptec 1430SA)
           ·   88F5182 SoC
           ·   88F6281 SoC
           ·   MV78100 SoC

     Note, that this hardware supports command queueing and FIS-based switching only for ATA DMA
     commands.  ATAPI and non-DMA ATA commands executed one by one for each port.


     ada(4), ata(4), cam(4), cd(4), da(4), sa(4)


     The mvs driver first appeared in FreeBSD 8.1.


     Alexander Motin <>