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NATA(4)			 BSD Kernel Interfaces Manual		       NATA(4)

     nata, acd, ad, afd, ast — generic ATA/ATAPI disk controller driver

     For ISA based ATA/ATAPI support:
     device isa
     device nata0 at isa? port IO_WD1 irq 14
     device nata1 at isa? port IO_WD2 irq 15

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

     To support ATA compliant disk drives:
     device natadisk

     To support ATA software RAIDs:
     device nataraid

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

     To support ATAPI floppy drives:
     device natapifd

     To support ATAPI tape drives:
     device natapist

     The following tunables are settable from the loader:

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

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

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

     The nata 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.

     Nata is the default ATA driver of DragonFly.  The old FreeBSD 4.8 driver
     is still available, but deprecated.  For more information, see ata(4).

     The currently supported ATA/SATA controller chips are:

     Acard:	     ATP850P, ATP860A, ATP860R, ATP865A, ATP865R.
     ALI:	     M5229, M5281, M5287, M5288, M5289.
     AMD:	     AMD756, AMD766, AMD768, AMD8111.
     ATI:	     IXP200, IXP300, IXP400.
     CMD:	     CMD646, CMD646U2, CMD648, CMD649.
     Cypress:	     Cypress 82C693.
     Cyrix:	     Cyrix 5530.
     HighPoint:	     HPT302, HPT366, HPT368, HPT370, HPT371, HPT372, HPT372N,
     Intel:	     6300ESB, 31244, PIIX, PIIX3, PIIX4, ESB2, ICH, ICH0,
		     ICH2, ICH3, ICH4, ICH5, ICH6, ICH7, ICH8, ICH9.
     ITE:	     IT8211F, IT8212F.
     JMicron:	     JMB360, JMB361, JMB363, JMB365, JMB366, JMB368.
     Marvell	     88SX5040, 88SX5041, 88SX5080, 88SX5081, 88SX6041,
		     88SX6081, 88SX6101, 88SX6141.
     National:	     SC1100.
     NetCell:	     NC3000, NC5000.
     nVidia:	     nForce, nForce2, nForce2 MCP, nForce3, nForce3 MCP,
		     nForce3 Pro, nForce4.
     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,

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

     The nata driver sets the maximum transfer mode supported by the hardware
     as default.  However the nata driver sometimes warns: “DMA limited to
     UDMA33, non-ATA66 cable or device”.  This means that the nata 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.

     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 natacontrol(8), but be aware that your
     hardware might not support it and can potentially hang the entire system
     causing data loss.

     /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/config/GENERIC  sample generic kernel config file for nata based

     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

     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.

     ahci(4), ata(4), nataraid(4), sili(4), burncd(8), natacontrol(8)

     The ata(4) driver first appeared in FreeBSD 4.0.  A later version was
     imported into DragonFly 1.7 as nata.

     Søren Schmidt ⟨⟩.

BSD				January 1, 2008				   BSD

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