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ata

Name
     ata - AT attachment disk driver

Synopsis
     ide@unit-address

Description
     The ata driver supports disk and ATAPI CD/DVD  devices  con-
     forming  to  the  AT  Attachment specification including IDE
     interfaces. Support is provided for both parallel ATA (PATA)
     and serial ATA (SATA) interfaces.


     Refer to the Solaris x86 Hardware Compatibility List  for  a
     list of supported controllers.

Preconfigure
     A PCI IDE controller can operate in compatibility mode or in
     PCI-native  mode.  If more than one controller is present in
     the system, only one can operate in compatibility mode.


     If two PATA drives share the same controller, you  must  set
     one  to  master  and the other to slave. If both a PATA disk
     drive and a PATA CD-ROM drive utilize the  same  controller,
     you  can designate the disk drive as the master with the CD-
     ROM drive as the slave, although this is not mandatory.

  Supported Settings
     Supported settings for the primary controller when in compa-
     tibility mode are:

         o    IRQ Level: 14

         o    I/O Address: 0x1F0


     Supported settings for the secondary controller when in com-
     patibility mode are:

         o    IRQ Level: 15

         o    I/O Address: 0x170

     Note -

       When in PCI-native mode, the IRQ and I/O address resources
       are configured by the system BIOS.

  Known Problems and Limitations
         o    This driver does  not  support  any  RAID  features

              present on a PATA/SATA controller. As a result, you
              should configure BIOS to  select  IDE  mode  rather
              than  RAID  mode. Some systems may require updating
              BIOS to allow switching modes.

         o    On some systems,  the  SATA  controller  must  have
              option  ROM  enabled or BIOS will not consider SATA
              drives as bootable devices.

         o    Panasonic LK-MC579B and  the  Mitsumi  FX34005  IDE
              CD-ROM  drives are not supported and cannot be used
              to install the Solaris operating environment.

         o    CMD-604 is unable to  handle  simultaneous  I/O  on
              both IDE interfaces. This defect causes the Solaris
              software to hang if both interfaces are  used.  Use
              only the primary IDE interface at address 0x1F0.

         o    NEC CDR-260/CDR-260R/CDR-273 and Sony CDU-55E ATAPI
              CD-ROM drives might fail during installation.

         o    Sony CDU-701 CD-ROM drives must be upgraded to  use
              firmware  version  1.0r or later to support booting
              from the CD.

              A Compact Flash(CF) card can work as  an  ATA  disk
              through  a  CF-to-ATA  adapter.  If  both  card and
              adapter implement Compact Flash Version 2.0, DMA is
              supported.  If  either of them does not, you should
              set ata-disk-dma-enabled to `0.'

Configuration
     The ata driver properties are usually set in ata.conf.  How-
     ever,  it may be convenient, or in some cases necessary, for
     you to set some of the DMA related properties  as  a  system
     global  boot environment property. You set or modify proper-
     ties in the boot environment immediately  prior  to  booting
     the Solaris kernel using the GRUB boot loader multiboot com-
     mand line. You can  also  set  boot  environment  properties
     using  the  eeprom(1M)  command or by editing the bootenv.rc
     configuration file.  If  a  property  is  set  in  both  the
     driver's   ata.conf  file  and  the  boot  environment,  the
     ata.conf property takes precedence.


     Property modifications other than with  the  GRUB  multiboot
     command  line are not effective until you reboot the system.
     Property modifications via the GRUB multiboot  command  line
     do not persist across future boots.

     Direct Memory Access is enabled for disks and  atapi  CD/DVD
     by  default.  If you want to disable DMA when booting from a
     CD/DVD, you must first set atapi-cd-dma-enabled to  0  using
     the GRUB multiboot command line.

     ata-dma-enabled
         This property is examined before the DMA properties dis-
         cussed  below.  If it is set to `0,' DMA is disabled for
         all ATA/ATAPI devices, and no  further  property  checks
         are  made.  If this property is absent or is set to `1,'
         DMA status is determined by further examining one of the
         other properties listed below.


     ata-disk-dma-enabled
         This property is examined only for ATA disk devices, and
         only if ata-dma-enabled is not set to `0.'

         If ata-disk-dma-enabled set to `0,' DMA is disabled  for
         all  ATA disks in the system. If this property is absent
         or set to `1,' DMA is enabled for all ATA disks  and  no
         further  property  checks are made. If needed, this pro-
         perty should be created by the administrator  using  the
         GRUB multiboot command line or the eeprom(1M) command.


     atapi-cd-dma-enabled
         This property is examined only for ATAPI CD/DVD devices,
         and only if ata-dma-enabled is not set to `0.'

         If atapi-cd-dma-enabled is absent or set to `0,' DMA  is
         disabled  for  all ATAPI CD/DVD's. If set to `1,' DMA is
         enabled and no further property checks are made.

         The Solaris installation program creates  this  property
         in  the  boot environment with a value of `1.' It can be
         changed  with  the  GRUB  multiboot  command   line   or
         eeprom(1M)  as shown in the Example section of this man-
         page.


     atapi-other-dma-enabled
         This property is examined only for non-CD/DVD ATAPI dev-
         ices  such  as  ATAPI  tape drives, and only if ata-dma-
         enabled is not set to `0.'

         If atapi-other-dma-enabled is set to `0,'  DMA  is  dis-
         abled for all non-CD/DVD ATAPI devices. If this property
         is absent or set to `1,' DMA is enabled and  no  further
         property checks are made.

         If needed,  this  property  should  be  created  by  the
         administrator  using  the GRUB multiboot command line or
         the eeprom(1M) command.


     drive0_block_factor
     drive1_block_factor
         ATA controllers support some amount of buffering (block-
         ing).  The  purpose  is  to  interrupt  the host when an
         entire buffer full of data  has  been  read  or  written
         instead  of  using  an  interrupt  for each sector. This
         reduces interrupt overhead and  significantly  increases
         throughput.  The  driver  interrogates the controller to
         find the buffer size. Some controllers hang when buffer-
         ing is used, so the values in the configuration file are
         used by the driver to reduce  the  effect  of  buffering
         (blocking). The values presented may be chosen from 0x1,
         0x2, 0x4, 0x8 and 0x10.

         The values as shipped are set to 0x1, and  they  can  be
         tuned to increase performance.

         If your controller hangs when attempting to  use  higher
         block  factors,  you may be unable to reboot the system.
         For x86 based systems, it is recommended that tuning  be
         performed      using      a     duplicate     of     the
         /platform/i86pc/kernel directory subtree.  This  ensures
         that  a bootable kernel subtree exists in the event of a
         failed test.


     ata-revert-to-defaults
     revert-<diskmodel>
         When rebooting or shutting down, the driver  can  set  a
         feature which allows the drive to return to the power-on
         settings when the drive receives a software reset (SRST)
         sequence.  If this property is present and set to 1, the
         driver will set the feature to revert to defaults during
         reset.  Setting this property to 1 may prevent some sys-
         tems from soft-rebooting and would require  cycling  the
         power  to  boot  the  system.  If  this  property is not
         present the system will not set the feature to revert to
         defaults during reset.

         To determine the string to substitute  for  <diskmodel>,
         boot your system (you may have to press the reset button
         or power-cycle) and then  view  /var/adm/messages.  Look
         for  the string "IDE device at targ" or "ATAPI device at
         targ." The next line will contain the word "model"  fol-
         lowed  by the model number and a comma. Ignore all char-
         acters except letters, digits, ".", "_", and "-". Change
         uppercase  letters  to lower case. If the string revert-
         <diskmodel> is longer than 31 characters, use  only  the
         first 31 characters.

Examples
     Example 1 Sample ata Configuration File

       # for higher performance - set block factor to 16
            drive0_block_factor=0x1 drive1_block_factor=0x1
            max_transfer=0x100
            flow_control="dmult" queue="qsort" disk="dadk" ;


     Example 2 Revert to defaults property

       revert-st320420a=1;



     Output of /var/adm/messages:


       Aug 17 06:49:43 caesar ata:[ID 640982 kern.info] IDE device at targ 0,
                                  lun 0 lastlun 0x0
       Aug 17 06:49:43 caesar ata:[ID 521533 kern.info] model ST320420A, stat


     Example 3 Change DMA property using GRUB


     To change a DMA property using the  GRUB  multiboot  command
     line:

         1.   Reset the system.

         2.   Select, then press "e" to edit the desired entry.

         3.   Navigate to the multiboot line.

         4.   If there is no existing -B option:

              Add: -B atapi-cd-dma-enabled=1

              else...

              Add:  atapi-cd-dma-enabled=1  to  the  end  of  the
              current  -B  option.  For example:-B foo=bar,atapi-
              cd-dma-enabled=1.

         5.   Press Enter to commit the edited  line  to  memory.
              (Does not write to the disk and is non-persistent).

         6.   Press <Control>+X (or F10 on UEFI systems) to  boot
              the modified entry.

     Example 4 Change DMA Property with eeprom(1M)


     To enable DMA for optical devices while the  Solaris  kernel
     is running with the eeprom(1M) system command:


       eeprom `atapi-cd-dma-enabled=1'

Files
     /platform/i86pc/kernel/drv/ata
         Device driver.


     /platform/i86pc/kernel/drv/ata.conf
         Configuration file.


     /boot/solaris/bootenv.rc
         Boot  environment  variables  file  for   Solaris   x86.
         eeprom(1M)  can  be  used  to  modify properties in this
         file.

Attributes
     See attributes(5) for descriptions of the  following  attri-
     butes:



     tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i)  ATTRI-
     BUTE TYPEATTRIBUTE VALUE _ Architecturex86

See Also
     eeprom(1M), attributes(5), grub(5)


     INCITS T13 ATA/ATAPI-7 specifications
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