ahci(7D) Devices ahci(7D)NAMEahci - 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/ahci
32-bit ELF kernel module (x86)
/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 attribute:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Architecture │x86 │
├─────────────────────────────┼─────────────────────────────┤
│Availability │driver/storage/ahci │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOcfgadm(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.
Note that booting is not supported if toggle exists between the [IDE]
and [AHCI] BIOS options
SunOS 5.10 5 Jan 2011 ahci(7D)
