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ahci(4d)

Device Drivers & /dev files                                           ahci(4D)



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  Con‐
       troller  Interface 1.0 specification. AHCI is an Intel-developed proto‐
       col 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  specification. The Intel ICH6/7/8/9 and VIA
       vt8251 controllers support standard SATA features. The ahci driver cur‐
       rently supports 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 properties. The  HBA
       might  not  work properly if above properties are not correctly config‐
       ured.


       The ahci driver supports following modifiable properties:

       ahci-dma-prdt-number

           Specifies the number of PRDT in the command table. The PRDT (Physi‐
           cal  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 disables 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 supports. The default value is 1. Specifying
           a 0 disables 64-bit dma addressing for the data buffer and communi‐
           cation 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 communication
           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(7) for descriptions of the following attribute:


       tab()  box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
       TRIBUTE VALUE _ Architecturex86 _ Availabilitydriver/storage/ahci


SEE ALSO
       sata(4D), attributes(7), cfgadm(8), cfgadm_sata(8), prtconf(8)


       Advanced Host Controller Interface 1.0


       Writing Device Drivers in Oracle Solaris 11.4

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



Oracle Solaris 11.4               4 Jan 2012                          ahci(4D)
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