2011-03-30 13:49:47 +00:00
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.TH SDAHCI 3
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.SH NAME
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sdahci \- AHCI (Advanced Host Controller Interface) SATA (Serial ATA) storage device drivers
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.SH SYNOPSIS
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.nf
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.B bind -a #S /dev
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.sp 0.3v
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.BI /dev/sdctl
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.sp 0.3v
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.BI /dev/sd En /ctl
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.BI /dev/sd En /raw
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.BI /dev/sd En /data
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\&...
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.fi
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.SH DESCRIPTION
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The
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.I sdahci
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driver provides access to AHCI devices via the
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.IR sd (3)
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interface.
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The AHCI programming interface supports up to 32
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hot-swappable ATAPI or hard disk-like devices per controller.
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The legacy IDE interface provided by
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.B sdata.c
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supports up to four drives which are not hot-swappable.
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Controller drive letters are assigned from
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.L E
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onward.
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.PP
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AHCI controllers are detected automatically.
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Currently Intel and AMD controllers are detected.
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Intel controllers need to have AHCI enabled in the BIOS.
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For
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.L ich
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parts this typically means enabling
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enhanced mode and AHCI.
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For ESB (Enterprise South Bridge) -based
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parts, only enhanced mode needs to be enabled.
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Intel
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.BR ich9 -based
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AHCI does not support hot swapping and
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drives must be connected to the lowest-numbered free port.
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.PP
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The top level control file,
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.BR /dev/sdctl ,
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supports the following control messages for
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.IR sdahci :
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2018-09-11 07:23:35 +00:00
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.TF "\fLahci idprint"
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2011-03-30 13:49:47 +00:00
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.TP
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2018-09-11 07:23:35 +00:00
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.B ahci debug
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2011-03-30 13:49:47 +00:00
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Toggle debug messages. Default is off.
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.TP
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2018-09-11 07:23:35 +00:00
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.B ahci idprint
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2011-03-30 13:49:47 +00:00
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Toggle printing of drive identification messages. Default is on.
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Prints short messages when a drive is identified or removed.
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.TP
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2018-09-11 07:23:35 +00:00
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.B ahci aprint
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2011-03-30 13:49:47 +00:00
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Print verbose ATAPI debugging messages. Default is off.
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.PD
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.PP
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The device-level
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.B ctl
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file supports:
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.TF \fLsmartdisable
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.TP
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.B flushcache
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Send the ATA/ATAPI
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.B FLUSH CACHE
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command
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.RB ( 0xe7
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or
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.BR 0xea ).
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This command may take up to 60 seconds to complete.
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.TP
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.B identify
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Send the ATA/ATAPI
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.B IDENTIFY DEVICE
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command
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.RB ( 0xec ).
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If device information has changed, the new size,
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features and serial will be noted.
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If changed, I/O on existing file
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descriptors will result in the error string
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.LR "media or partition has changed" .
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.TP
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.BI "mode " speed
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Change the connection
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.I speed
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to one of
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.BR auto ,
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.BR satai
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or
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.BR sataii .
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.TP
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.B nop
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Send the ATA
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.B NOP
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command
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.RB ( 0 )
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if the device supports it. Per standard, the result is always an error.
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.TP
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.B smart
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Send the ATA/ATAPI
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.B SMART RETURN STATUS
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command
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.RB ( 0xda ).
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This will fail unless SMART is enabled on the drive.
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.TP
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.B smartdisable
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Disable SMART on the drive. SMART is a persistent property of the drive.
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.TP
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.B smartenable
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Enable SMART on the drive.
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.TP
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.BI "state " state
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Force a transition to the named
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.IR state .
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The states are:
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.RS
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.TF portreset
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.TP
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.B null
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ignored (may only be reached manually);
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.TP
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.B missing
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not detected;
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.TP
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.B new
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powered down or newly discovered;
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.TP
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.B ready
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ready for commands;
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.TP
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.B reset
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being reset gently;
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.TP
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.B portreset
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being fully reset;
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.TP
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.B offline
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device failed
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.B portreset
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(a port reset will be attempted periodically).
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.RE
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.PD
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.PP
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For devices present at boot, the transition is from state
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.B new
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to state
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.BR ready .
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.SH SOURCE
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.B /sys/src/9/pc/sdiahci.c
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.SH SEE ALSO
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2011-04-13 02:58:33 +00:00
|
|
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.IR sd (3)
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2011-03-30 13:49:47 +00:00
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.br
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.BR http://download.intel.com/technology/serialata/pdf/rev1_2.pdf .
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.SH BUGS
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None of enclosure management, LED control and port multipliers are supported.
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.PP
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ATAPI devices may not be reset when they have outstanding commands.
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