SDAHCI(3)                                               SDAHCI(3)

     NAME
          sdahci - AHCI (Advanced Host Controller Interface) SATA
          (Serial ATA) storage device drivers

     SYNOPSIS
          bind -a #S /dev

          /dev/sdctl
          /dev/sdEn/ctl
          /dev/sdEn/raw
          /dev/sdEn/data
          ...

     DESCRIPTION
          The sdahci driver provides access to AHCI devices via the
          sd(3) interface.  AHCI devices use the ATA command set.  The
          AHCI programming interface supports up to 32 hot-swappable
          ATAPI or hard disk-like devices per controller.  The legacy
          IDE interface provided by sdata.c supports up to four drives
          which are not hot-swappable.  Controller drive letters are
          assigned from `E' onward.

          AHCI controllers are detected automatically.  Currently ALi,
          AMD, Intel, JMicron, Marvell, SiS, VIA, and nVidia con-
          trollers are detected.  Intel controllers need to have AHCI
          enabled in the BIOS.  For ICH (I/O Controller Hub) parts
          this typically means enabling enhanced mode and AHCI.  For
          ESB (Enterprise South Bridge) -based parts, only enhanced
          mode needs to be enabled.  Due to hardware errata, Intel
          ich9-based AHCI does not support hot swapping and drives
          must be connected to the lowest-numbered free port.

          The top level control file, /dev/sdctl, supports the follow-
          ing control messages for sdahci:

          iahci debug    Toggle debug messages.  Default is off.
          iahci idprint  Toggle printing of drive identification mes-
                         sages.  Default is on.  Prints short messages
                         when a drive is identified or removed.
          iahci aprint   Print verbose ATAPI debugging messages.
                         Default is off.

          The device-level ctl file supports:

          mode speed
                Change the connection speed to one of auto, satai,
                sataii, or sataiii.
          state state
                Force a transition to the named state. The states are:
                null       ignored (may only be reached manually);

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     SDAHCI(3)                                               SDAHCI(3)

                missing    not detected;
                new        powered down or newly discovered;
                ready      ready for commands;
                reset      being reset gently;
                portreset  being fully reset;
                offline    device failed portreset (a port reset will
                           be attempted periodically).

          For devices present at boot, the transition is from state
          new to state ready.

     SOURCE
          /sys/src/9/pc/sdiahci.c

     SEE ALSO
          atazz(8), sd(3), 9load(8)
          http://download.intel.com/technology/serialata/pdf/rev1_3.pdf.

     BUGS
          Enclosure management, LED control and port multipliers are
          supported.

          ATAPI devices may not be reset when they have outstanding
          commands.

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