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ahci

Name
     ahci - Advanced Host Controller  Interface  SATA  controller
     driver

Synopsis
     sata@unit-address

Description
     The ahci driver is a  SATA  framework-compliant  HBA  driver
     that  supports SATA HBA controllers that are compatible with
     the Advanced Host Controller  Interface  1.0  specification.
     AHCI  is  an  Intel-developed  protocol  that  describes the
     register-level interface for host controllers for serial ATA
     1.0a and Serial ATA II. The AHCI 1.0 specification describes
     the interface between the system software and the host  con-
     troller hardware.


     The ahci driver currently supports the Intel  ICH6/7/8/9/10,
     VIA  vt8251 and JMicron AHCI controllers which are compliant
     with the Advanced Host Controller Interface  1.0  specifica-
     tion.  The  Intel ICH6/7/8/9 and VIA vt8251 controllers sup-
     port standard SATA features. The ahci driver currently  sup-
     ports  hard  disk,  ATAPI  DVD, ATAPI tape, ATAPI disk (i.e.
     Dell RD1000), hotplug, NCQ (Native command queuing) and Port
     multipliers  (Silicon  Image 3726/4726). Power management is
     not yet supported.

Configuration
     The ahci driver is  configured  by  defining  properties  in
     ahci.conf.  These properties override the default settings.


     Contact the hardware vendor before modifying  these  proper-
     ties.  The  HBA  might not work properly if above properties
     are not correctly configured.


     The ahci driver supports following modifiable properties:

     ahci-dma-prdt-number
         Specifies the number of PRDT in the command  table.  The
         PRDT  (Physical  Region  Descriptor  Table) contains the
         scatter/gather list for the data transfer. The number of
         PRDT  in  the command table can be from 1 to 65,535. The
         default value is 257, (1MB (256KB/pg * 256) +  1)..  See
         the AHCI specification for more details.

     ahci-msi-enabled
         Enables  the  MSI  interrupt.  The  ahci  driver  always
         enables  the MSI (Message Signaled Interrupt) if the HBA
         supports. The default value is 1. Specifying  a  0  dis-
         ables MSI and uses legacy interrupt.


     ahci-buf-64bit-dma
     ahci-commu-64bit-dma
         Enables 64-bit  DMA  support.  The  ahci  driver  always
         enables  64-bit DMA addressing for the data transfer and
         the communication system descriptors  if  the  HBA  sup-
         ports.  The  default value is 1. Specifying a 0 disables
         64-bit dma addressing for the data buffer and communica-
         tion system descriptors respectively.


     sb600-buf-64bit-dma-disable
         The ahci driver disables 64-bit DMA addressing for  data
         buffer on AMD/ATI SB600 by default. The default value is
         1. Specifying 0 switches on 64-bit  DMA  addressing  for
         the data buffer on SB600 chip sets.


     sbxxx-commu-64bit-dma-disable
         The ahci driver disables 64-bit DMA addressing for  com-
         munication  system  descriptors  on  AMD/ATI  SB  series
         (SB600/700/710/750/800) by default. The default value is
         1.  Specifying  0  switches on 64-bit DMA addressing for
         communication system descriptors on these chip sets.

Files
     /kernel/drv/amd64/ahci
         64-bit ELF kernel module (x86)


     /kernel/drv/ahci.conf
         Optional configuration file

Attributes
     See attributes(5) for descriptions of the  following  attri-
     bute:



     tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i)  ATTRI-
     BUTE     TYPEATTRIBUTE    VALUE    _    Architecturex86    _

     Availabilitydriver/storage/ahci

See Also
     cfgadm(1M),  cfgadm_sata(1M),  prtconf(1M),   attributes(5),
     sata(7D)


     Advanced Host Controller Interface 1.0


     Writing Device Drivers

Notes
     To bind the ahci  driver  to  your  controller,  choose  the
     [AHCI] BIOS option.


     Booting is not supported if toggle exists between the  [IDE]
     and [AHCI] BIOS options
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