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ATA(4) BSD 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 To enable static controller and device numbering (see the NOTES section below): options ATA_STATIC_ID The following tunables are setable 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 and DTLA drives support that) DESCRIPTION This driver provides access to disk drives, ATAPI CD-ROM and DVD drives, ZIP drives and tape streamers connected to controllers 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 33 (UDMA2), 33 MB/sec 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 HighPoint HPT366 Ultra DMA 66 (UDMA4), 66 MB/sec HighPoint HPT370 Ultra DMA 100 (UDMA5), 100 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 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 ServerWorks ROSB4 Ultra DMA 33 (UDMA2), 33 MB/sec SiS 5591 Ultra DMA 33 (UDMA2), 33 MB/sec Cyrix 5530 Ultra DMA 33 (UDMA2), 33 MB/sec VIA 82C586 Ultra DMA 33 (UDMA2), 33 MB/sec VIA 82C686a Ultra DMA 66 (UDMA4), 66 MB/sec VIA 82C686b Ultra DMA 100 (UDMA5), 100 MB/sec All unknown chipsets can be supported at the maximum speed of 16 MB/sec. The ata driver also allows for changes to the transfer mode of the de- vices at a later time when the system is up and running. The driver attempts to set the maximum performance transfer mode on your disk drives by selecting the highest possible DMA mode. 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 the sysctl method described here, but be aware that your hardware might not support it and can hang the system. To see the devices' current access modes, use the command line: sysctl hw.atamodes which results in the modes of the devices being displayed as a string like this: hw.atamodes: dma,pio,---,pio,dma,---,dma,---, (--- = no device) This means that ata0-master is in DMA mode, ata0-slave is in PIO mode, and so forth. You can set the mode with sysctl and a string like the above, for example: sysctl hw.atamodes=pio,pio,---,dma,pio,---,dma,---, The new modes are set as soon as the sysctl command returns. 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 ab- sent 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. 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>. BSD January 27, 2000 BSD
NAME | SYNOPSIS | DESCRIPTION | FILES | NOTES | HISTORY | AUTHORS
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