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

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

SYNOPSIS
     For ISA based ATA/ATAPI support:
     device isa
     device ata0 at isa? port IO_WD1 irq 14
     device ata1 at isa? port IO_WD2 irq 15

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

     To support ATA compliant disk drives:
     device atadisk

     To support ATAPI CD-ROM, CDR, CDRW, DVD-ROM and DVD-RAM drives:
     device atapicd

     To support ATAPI floppy drives, such as the ZIP and LS120:
     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 PIO).

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

     hw.ata.tags
     set to 1 to enable Tagged Queuing support, 0 to disable (default is dis-
     abled).  (Only IBM DPTA, DTLA, ICxxxxxxAT, ICxxxxxxAV drives support
     that.)

DESCRIPTION
     This driver provides access to ATA (IDE) and SerialATA disk drives, ATAPI
     CD-ROM and DVD drives, ZIP drives and tape streamers connected to con-
     trollers according to the ATA and ATAPI standards.  These devices are
     also commonly known as IDE or EIDE devices.

     The currently supported controllers with their maximum speed include:

     Acerlabs Aladdin                       Ultra DMA 100 (UDMA5), 100 MB/sec
                                            (depending on model, max stated at
                                            boot)
     AMD 756                                Ultra DMA 66 (UDMA4), 66 MB/sec
     AMD 766                                Ultra DMA 100 (UDMA5), 100 MB/sec
     CMD 646                                DMA 2 (WDMA2), 16 MB/sec
     CMD 648                                Ultra DMA 66 (UDMA4), 66 MB/sec
     CMD 649                                Ultra DMA 100 (UDMA5), 100 MB/sec
     Cypress 82C693                         DMA 2 (WDMA2), 16 MB/sec
     Cyrix 5530                             Ultra DMA 33 (UDMA2), 33 MB/sec
     HighPoint HPT366                       Ultra DMA 66 (UDMA4), 66 MB/sec
     HighPoint HPT370                       Ultra DMA 100 (UDMA5), 100 MB/sec
     HighPoint HPT372                       Ultra DMA 133 (UDMA6), 133 MB/sec
     HighPoint HPT374                       Ultra DMA 133 (UDMA6), 133 MB/sec
     Intel PIIX                             DMA 2 (WDMA2), 16 MB/sec
     Intel PIIX3                            DMA 2 (WDMA2), 16 MB/sec
     Intel PIIX4                            Ultra DMA 33 (UDMA2), 33 MB/sec
     Intel ICH0                             Ultra DMA 33 (UDMA2), 33 MB/sec
     Intel ICH                              Ultra DMA 66 (UDMA4), 66 MB/sec
     Intel ICH2                             Ultra DMA 100 (UDMA5), 100 MB/sec
     Intel ICH3                             Ultra DMA 100 (UDMA5), 100 MB/sec
     Intel ICH4                             Ultra DMA 100 (UDMA5), 100 MB/sec
     Intel ICH5                             SATA 150, 150 MB/sec
     Promise Ultra/Fasttrak-33              Ultra DMA 33 (UDMA2), 33 MB/sec
     Promise Ultra/Fasttrak-66              Ultra DMA 66 (UDMA4), 66 MB/sec
     Promise Ultra/Fasttrak-100             Ultra DMA 100 (UDMA5), 100 MB/sec
     Promise Ultra/Fasttrak-100 TX2/TX4     Ultra DMA 100 (UDMA5), 100 MB/sec
     Promise Ultra/Fasttrak-133 TX2/TX2000  Ultra DMA 133 (UDMA6), 133 MB/sec
     ServerWorks ROSB4                      Ultra DMA 33 (UDMA2), 33 MB/sec
     ServerWorks CSB5                       Ultra DMA 100 (UDMA5), 100 MB/sec
                                            (depending on model, max stated at
                                            boot)
     Sil 0680                               Ultra DMA 133 (UDMA6), 133 MB/sec
                                            (depending on model, max stated at
                                            boot)
     SiS 5591                               Ultra DMA 100 (UDMA5), 100 MB/sec
                                            (depending on model, max stated at
                                            boot)
     VIA 82C586                             Ultra DMA 33 (UDMA2), 33 MB/sec
     VIA 82C596                             Ultra DMA 66 (UDMA4), 66 MB/sec
                                            (depending on model, max stated at
                                            boot)
     VIA 82C686a                            Ultra DMA 66 (UDMA4), 66 MB/sec
     VIA 82C686b                            Ultra DMA 100 (UDMA5), 100 MB/sec
     VIA 8233/8235                          Ultra DMA 133 (UDMA6), 133 MB/sec
                                            (depending on model, max stated at
                                            boot)
     VIA 8237                               SATA 150, 150 MB/sec

     All unknown chipsets are supported at the maximum speed of 16 MB/sec.

     The ata driver also allows for changes to the transfer mode of the
     devices at a later time when the system is up and running, see
     atacontrol(8).

     The driver attempts to set the maximum performance transfer mode on your
     disk drives by selecting the highest possible DMA mode. However the ata
     driver sometimes issue the message "DMA limited to UDMA33, non-ATA66
     cable or device", if the cable is ATA66 (or above) compliant, it is
     because the other device on this channel states it can only accept upto
     UDMA2/ATA33 signals.  ATAPI devices are left in PIO mode because DMA
     problems are common despite the device specifications.  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 hang the system.

FILES
     /dev/ad*                 ATA disk 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
     Static numbering (enabled with the ATA_STATIC_ID kernel option) reserves
     a number for each possibly connected disk, even when not present.  This
     may result in odd situations where, for example, ad0 and ad2 exist in the
     absence of ad1.  The advantage is that the addition of the formerly
     absent drive does not cause the numbers of the other drives to change.

     The ata driver does not support MFM/RLL/ESDI (ST-506) style disks.

     Remember that in order to use UDMA4 (and above) mode you have to use a
     special 80 conductor cable, and the driver tries to determine if you have
     such a cable attached before setting UDMA4 mode.

     The use of UDMA4(66MHz) and higher together with non-UDMA4 devices on the
     same ATA channel is not recommended, unless they are run at the non-UDMA4
     device's lower speed.  The driver has been designed to handle that kind
     of setup but lots of older devices do not like this.

SEE ALSO
     atacontrol(8), burncd(8)

HISTORY
     The ata driver first appeared in FreeBSD 4.0.

AUTHORS
     The ata driver was written by Soren Schmidt <sos@FreeBSD.org>.

     This manual page was written by Jeroen Ruigrok van der Werven
     <asmodai@FreeBSD.org> and Soren Schmidt <sos@FreeBSD.org>.

FreeBSD 4.10                   January 27, 2000                   FreeBSD 4.10

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

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