sdahci man page on Plan9

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SDAHCI(3)							     SDAHCI(3)

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

       bind -a #S /dev

       The sdahci driver provides access to AHCI devices via the sd(3)	inter‐
       face.   The  AHCI programming interface supports up to 32 hot-swappable
       ATAPI or disk-like devices per controller.  The	legacy	IDE  interface
       provided	 by sdata.c supports up to four drives which are not hot-swap‐
       pable.  Controller drive letters are assigned from onward.

       AHCI controllers are detected automatically.  Currently Intel  and  AMD
       controllers  are detected.  Intel controllers need to have AHCI enabled
       in the BIOS.  For parts this typically means enabling enhanced mode and
       AHCI.   For  ESB	 (Enterprise South Bridge) -based parts, only enhanced
       mode needs to be enabled.  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 following control
       messages for sdahci:

       iahci debug
	      Toggle debug messages.  Default is off.

       iahci idprint
	      Toggle printing of drive identification  messages.   Default  is
	      on.   Prints  short  messages  when  a  drive  is	 identified or

       iahci aprint
	      Print verbose ATAPI debugging messages.  Default is off.

       The device-level ctl file supports:

	      Send the ATA/ATAPI FLUSH CACHE command  (0xe7  or	 0xea).	  This
	      command may take up to 60 seconds to complete.

	      Send  the	 ATA/ATAPI  IDENTIFY DEVICE command (0xec).  If device
	      information has changed, the new size, features and serial  will
	      be  noted.   If  changed,	 I/O on existing file descriptors will
	      result in the error string

       mode speed
	      Change the connection speed to one of auto, satai or sataii.

       nop    Send the ATA NOP command (0) if  the  device  supports  it.  Per
	      standard, the result is always an error.

       smart  Send  the	 ATA/ATAPI  SMART  RETURN STATUS command (0xda).  This
	      will fail unless SMART is enabled on the drive.

	      Disable SMART on the drive.  SMART is a persistent  property  of
	      the drive.

	      Enable SMART on the drive.

       state state
	      Force a transition to the named state.  The states are:

	      null   ignored (may only be reached manually);

		     not detected;

	      new    powered down or newly discovered;

	      ready  ready for commands;

	      reset  being reset gently;

		     being fully reset;

		     device  failed  portreset (a port reset will be attempted

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



       None of enclosure management, LED control and port multipliers are sup‐

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

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