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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
 
      The following tunables are settable from the loader:
 
      hw.ata.ata_dma
      set to 1 for DMA access, 0 for PIO (default is DMA).
 
      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.
 

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:            M5229, M5281, M5287, 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,
                      HPT374.
      Intel:          6300ESB, 31244, PIIX, PIIX3, PIIX4, ICH, ICH0, ICH2,
                      ICH3, ICH4, ICH5, ICH6, ICH7.
      ITE:            IT8211F, IT8212F.
      National:       SC1100.
      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:    ROSB4, CSB5, CSB6.
      Silicon Image:  SiI0680, SiI3112, SiI3114, 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.
 
      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
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.
 
      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
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.
burncd(8)
 

HISTORY

      The ata driver first appeared in FreeBSD 4.0.
 

AUTHORS

      Søren Schmidt 〈sos@FreeBSD.org〉.
 

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