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ATA(4)		       FreeBSD Kernel Interfaces Manual			ATA(4)

NAME
     ata, ar, acd, ad, afd, ast	-- generic ATA/ATAPI disk controller driver

SYNOPSIS
     For ISA based ATA/ATAPI support:
     device isa
     device ata

     In	/boot/device.hints:
     hint.ata.0.at="isa"
     hint.ata.0.port="0x1f0"
     hint.ata.0.irq="14"
     hint.ata.1.at="isa"
     hint.ata.1.port="0x170"
     hint.ata.1.irq="15"

     For PC98 based ATA/ATAPI support:
     device isa
     device ata

     In	/boot/device.hints:
     hint.atacbus.0.at="isa"
     hint.atacbus.0.port="0x640"
     hint.atacbus.0.irq="9"

     For PCI based ATA/ATAPI support:
     device pci
     device ata

     To	support	ATA compliant disk drives:
     device atadisk

     To	support	ATA software RAID's:
     device ataraid

     To	support	ATAPI CDROM, DVD and CD/DVD burner drives:
     device atapicd

     To	support	ATAPI floppy drives:
     device atapifd

     To	support	ATAPI tape drives:
     device atapist

     To	turn ata(4) subsystem controller drivers into cam(4) interface modules
     (disables all native ata(4) APIs and periperal drivers):
     options ATA_CAM

     The following tunables are	settable from the loader:

     hw.ahci.force
     set to nonzero value for forcing drivers to attach	to some	known AHCI-
     capable chips even	if they	are configured for legacy IDE emulation	(the
     default is	1, force the attach).

     hw.ata.ata_dma
     set to 1 for DMA access, 0	for PIO	(default is DMA).

     hw.ata.ata_dma_check_80pin
     set to 0 to disable the 80pin cable check (default	is 1, check the
     cable).

     hw.ata.atapi_dma
     set to 1 for DMA access, 0	for PIO	(default is DMA).

     hw.ata.wc
     set to 1 to enable	Write Caching, 0 to disable (default is	enabled).
     WARNING: can cause	data loss on power failures and	crashes.

     hint.atapci.X.msi
     set to 1 to allow Message Signalled Interrupts (MSI) to be	used by	speci-
     fied PCI ATA controller, if supported.

     hint.ata.X.devX.mode
     limits the	initial	ATA mode for the specified device on the specified
     channel.

     hint.ata.X.mode
     limits initial ATA	mode for every device on specified channel.

     hint.ata.X.pm_level
     controls SATA interface Power Management for specified channel, allowing
     to	save some power	by the cost of additional command latency.  Possible
     values:
     0		   interface Power Management is disabled, default value.
     1		   device is allowed to	initiate PM state change, host is pas-
		   sive.
     2		   host	initiates PARTIAL PM state transition every time port
		   becomes idle.
     3		   host	initiates SLUMBER PM state transition every time port
		   becomes idle.
     Modes 2 and 3 are implemented only	for AHCI driver	now.

     hint.ata.X.devX.sata_rev
     limits the	initial	SATA revision (speed) for the specified	device on the
     specified channel.	 Values	1, 2 and 3 are respectively 1.5, 3 and 6Gbps.

     hint.ata.X.sata_rev
     Same, but for every device	on the specified channel.

DESCRIPTION
     The ata driver provides access to ATA (IDE) and SerialATA disk drives,
     ATAPI CDROM/DVD drives, ZIP/LS120 ATAPI drives and	ATAPI tape drives con-
     nected to controllers according to	the ATA/ATAPI standards.

     The currently supported ATA/SATA controller chips are:

     Acard:	     ATP850P, ATP860A, ATP860R,	ATP865A, ATP865R.
     ALI:	     M5228, M5229, M5281, M5283, M5287,	M5288, M5289.
     AMD:	     AMD756, AMD766, AMD768, AMD8111, CS5536.
     ATI:	     IXP200, IXP300, IXP400, IXP600, IXP700, IXP800.
     CMD:	     CMD646, CMD646U2, CMD648, CMD649.
     Cypress:	     Cypress 82C693.
     Cyrix:	     Cyrix 5530.
     HighPoint:	     HPT302, HPT366, HPT368, HPT370, HPT371, HPT372, HPT372N,
		     HPT374.
     Intel:	     6300ESB, 31244, PIIX, PIIX3, PIIX4, ESB2, ICH, ICH0,
		     ICH2, ICH3, ICH4, ICH5, ICH6, ICH7, ICH8, ICH9, ICH10,
		     SCH, PCH.
     ITE:	     IT8211F, IT8212F, IT8213F.
     JMicron:	     JMB360, JMB361, JMB363, JMB365, JMB366, JMB368.
     Marvell	     88SX5040, 88SX5041, 88SX5080, 88SX5081, 88SX6041,
		     88SX6042, 88SX6081, 88SE6101, 88SE6102, 88SE6111,
		     88SE6121, 88SE6141, 88SE6145, 88SX7042.
     National:	     SC1100.
     NetCell:	     NC3000, NC5000.
     nVidia:	     nForce, nForce2, nForce2 MCP, nForce3, nForce3 MCP,
		     nForce3 Pro, nForce4, MCP51, MCP55, MCP61,	MCP65, MCP67,
		     MCP73, MCP77, MCP79, MCP89.
     Promise:	     PDC20246, PDC20262, PDC20263, PDC20265, PDC20267,
		     PDC20268, PDC20269, PDC20270, PDC20271, PDC20275,
		     PDC20276, PDC20277, PDC20318, PDC20319, PDC20371,
		     PDC20375, PDC20376, PDC20377, PDC20378, PDC20379,
		     PDC20571, PDC20575, PDC20579, PDC20580, PDC20617,
		     PDC20618, PDC20619, PDC20620, PDC20621, PDC20622,
		     PDC40518, PDC40519, PDC40718, PDC40719.
     ServerWorks:    HT1000, ROSB4, CSB5, CSB6,	K2, Frodo4, Frodo8.
     Silicon Image:  SiI0680, SiI3112, SiI3114,	SiI3124, SiI3132, SiI3512.
     SiS:	     SIS180, SIS181, SIS182, SIS5513, SIS530, SIS540, SIS550,
		     SIS620, SIS630, SIS630S, SIS633, SIS635, SIS730, SIS733,
		     SIS735, SIS745, SIS961, SIS962, SIS963, SIS964, SIS965.
     VIA:	     VT6410, VT6420, VT6421, VT82C586, VT82C586B, VT82C596,
		     VT82C596B,	VT82C686, VT82C686A, VT82C686B,	VT8231,
		     VT8233, VT8233A, VT8233C, VT8235, VT8237, VT8237A,
		     VT8237S, VT8251, CX700, VX800, VX855, VX900.

     Unknown ATA chipsets are supported	in PIO modes, and if the standard bus-
     master DMA	registers are present and contain valid	setup, DMA is also
     enabled, although the max mode is limited to UDMA33, as it	is not known
     what the chipset can do and how to	program	it.

     The ata driver can	change the transfer mode and various other parameters
     when the system is	up and running.	 See atacontrol(8).

     The ata driver sets the maximum transfer mode supported by	the hardware
     as	default.  However the ata driver sometimes warns: ``DMA	limited	to
     UDMA33, non-ATA66 cable or	device''.  This	means that the ata driver has
     detected that the required	80 conductor cable is not present or could not
     be	detected properly, or that one of the devices on the channel only
     accepts up	to UDMA2/ATA33.	 The hw.ata.ata_dma_check_80pin	tunable	can be
     set to 0 to disable this check.

     Unknown ATAPI devices are initialized to DMA mode if the hw.ata.atapi_dma
     tunable is	set to 1 and they support at least UDMA33 transfers.  Other-
     wise they are set to PIO mode because severe DMA problems are common even
     if	the device capabilities	indicate support.  You can always try to set
     DMA mode on an ATAPI device using atacontrol(8), but be aware that	your
     hardware might not	support	it and can potentially hang the	entire system
     causing data loss.

FILES
     /dev/ad*		     ATA disk device nodes
     /dev/ar*		     ATA RAID device nodes
     /dev/acd*		     ATAPI CD-ROM device nodes
     /dev/afd*		     ATAPI floppy drive	device nodes
     /dev/ast*		     ATAPI tape	drive device nodes
     /sys/i386/conf/GENERIC  sample generic kernel config file for ata based
			     systems

NOTES
     Please remember that in order to use UDMA4/ATA66 and above	modes you must
     use 80 conductor cables.  Please assure that ribbon cables	are no longer
     than 45cm.	 In case of rounded ATA	cables,	the length depends on the
     quality of	the cables.  SATA cables can be	up to 1m long according	to the
     specification.

     Static device numbering (enabled with the ATA_STATIC_ID kernel option)
     reserves a	number for each	possibly connected disk, even when not
     present.  This is useful in hotswap scenarios where disks should always
     show up as	the same numbered device, and not depend on attach order.

     Native Command Queuing (NCQ) on SATA drives is not	yet supported.

SEE ALSO
     ahci(4), cam(4), ataraid(4), atacontrol(8), burncd(8), siis(4)

HISTORY
     The ata driver first appeared in FreeBSD 4.0.

AUTHORS
     Soren Schmidt <sos@FreeBSD.org>.

FreeBSD	9.2			October	3, 2012			   FreeBSD 9.2

NAME | SYNOPSIS | DESCRIPTION | FILES | NOTES | SEE ALSO | HISTORY | AUTHORS

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