Copyright (c) 2000 Jeroen Ruigrok van der Werven
Copyright (c) 2000 S�ren Schmidt
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$FreeBSD: head/share/man/man4/ata.4 56739 2000-01-28 12:24:53Z asmodai $
.Dd January 27, 2000 .Dt ATA 4 .Os FreeBSD 4.0 .Sh NAME .Nm ata .Nd Generic ATA/ATAPI disk controller driver .Sh SYNOPSIS For ISA based ATA/ATAPI support: .Cd device isa .Cd device ata0 at isa? port IO_WD1 irq 14 .Cd device ata1 at isa? port IO_WD2 irq 15
p For PCI based ATA/ATAPI support: .Cd device pci .Cd device ata
p To support ATA compliant disk drives: .Cd device atadisk
p To support ATAPI CD-ROM, CDR, CDRW or DVD drives: .Cd device atapicd
p To support ATAPI floppy drives, such as the ZIP and LS120: .Cd device atapifd
p To support ATAPI tape drives: .Cd device atapist
p To set the controller numbering to static, just like the .Xr wd 4 driver: .Cd options ATA_STATIC_ID
p To enable DMA on an ATAPI device: .Cd options ATA_ENABLE_ATAPI_DMA .Sh DESCRIPTION This driver provides access to disk drives, CD-ROM 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.
p The currently supported controllers with their maximum speed include:
p l -tag -width "Promise Fasttrak-33 " -compact t Acerlabs Aladdin Ultra DMA 33 (UDMA2), 33 MB/sec t AMD 756 Ultra DMA 66 (UDMA4), 66 MB/sec t HighPoint HPT366 Ultra DMA 66 (UDMA4), 66 MB/sec t Intel PIIX DMA 2 (WDMA2), 16 MB/sec t Intel PIIX3 DMA 2 (WDMA2), 16 MB/sec t Intel PIIX4 Ultra DMA 33 (UDMA2), 33 MB/sec t Intel ICH Ultra DMA 33 (UDMA2), 33 MB/sec t Promise Fasttrak-33 Ultra DMA 33 (UDMA2), 33 MB/sec t Promise Fasttrak-66 Ultra DMA 66 (UDMA4), 66 MB/sec t Promise Ultra-33 Ultra DMA 33 (UDMA2), 33 MB/sec t Promise Ultra-66 Ultra DMA 66 (UDMA4), 66 MB/sec t SiS 5591 Ultra DMA 33 (UDMA2), 33 MB/sec t VIA 82C586 Ultra DMA 33 (UDMA2), 33 MB/sec t VIA 82C686 Ultra DMA 66 (UDMA4), 66 MB/sec .El
p All unknown chipsets can be supported at the maximum speed of 16 MB/sec.
p 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.
p 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 .Em not support it and can .Em hang the system.
p To see the devices' current access modes, use the command line:
p .Dl sysctl hw.atamodes
p which results in the modes of the devices being displayed as a string like this:
p .Dl hw.atamodes: dma,pio,---,pio,dma,---,dma,---, (--- = no device)
p 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 -w and a string like the above, for example:
p .Dl sysctl -w hw.atamodes=pio,pio,---,dma,pio,---,dma,---,
p The new modes are set as soon as the sysctl command returns.
p .Sh FILES l -tag -width "/sys/i386/conf/GENERIC " -compact t Pa /dev/ad* ATA disk device nodes t Pa /dev/acd* ATAPI CD-ROM device nodes t Pa /dev/afd* ATAPI floppy drive device nodes t Pa /dev/ast* ATAPI tape drive device nodes t Pa /sys/i386/conf/GENERIC sample generic kernel config file for ata based systems .El .Sh NOTES The ata driver does not support MFM/RLL/ESDI (ST-506) style disks.
p Remember that in order to use UDMA4 mode you .Em 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.
p The use of UDMA4(66MHz) and 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 this but some older devices do not like this. .Sh AUTHORS The ata driver was written by .An S�ren Schmidt .Aq sos@freebsd.org .
p This manual page was written by .An Jeroen Ruigrok van der Werven .Aq asmodai@freebsd.org and .An S�ren Schmidt .Aq sos@freebsd.org .