ehci man page on Solaris

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ehci(7D)			    Devices			      ehci(7D)

NAME
       ehci - Enhanced host controller driver

SYNOPSIS
       usb@unit-address

DESCRIPTION
       The  ehci  driver  is a USBA (Solaris USB Architecture) compliant nexus
       driver that supports the Enhanced Host Controller Interface  Specifica‐
       tion 2.0, an industry standard developed by Intel.

       A  USB  2.0 host controller includes one high-speed host controller and
       zero or more USB 1.1 host controllers. The high-speed  host  controller
       implements  an  EHCI  (Enhanced Host Controller Interface) that is used
       for all high-speed communications to high-speed-mode devices.

       All USB 2.0 devices  connected to the root ports of the USB  2.0	  host
       controller  and	all devices connected to a high- speed-mode hub should
       be routed to the EHCI host controller.

       All full- and low-speed devices connected to the root ports of the  USB
       2.0 host controller should be routed to the companion USB 1.1 host con‐
       trollers. (OHCI or UHCI host controller).

       The ehci supports bulk, interrupt, control  and	iso chronous transfers
       (on USB1.x devices behind a USB2.0 hub).

FILES
       /kernel/drv/ehci

	   32-bit ELF 86 kernel module

       /kernel/drv/sparcv9/ehci

	   64-bit SPARC ELF kernel module

       /kernel/drv/amd64/ehci

	   64-bit x86 ELF kernel module

       /kernel/drv/ehci.conf

	   Driver configuration file

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌─────────────────────────────┬──────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	     ATTRIBUTE VALUE	    │
       ├─────────────────────────────┼──────────────────────────────┤
       │Architecture		     │SPARC, x86, PCI-based systems │
       ├─────────────────────────────┼──────────────────────────────┤
       │Availability		     │SUNWusb			    │
       └─────────────────────────────┴──────────────────────────────┘

SEE ALSO
       add_drv(1M),  prtconf(1M),  rem_drv(1M), update_drv(1M), attributes(5),
       hubd(7D), uhci(7D), ohci(7D), usba(7D)

       Writing Device Drivers

       Universal Serial Bus Specification 2.0

       Enhanced Host Controller Interface Specification 1.0

       System Administration Guide: Basic Administration

       http://www.usb.org

       http://www.sun.com/io

       http://www.sun.com/bigadmin/hcl

       http://www.intel.com/technology/usb/ehcispec.htm

DIAGNOSTICS
       In addition to being logged, the following messages may appear  on  the
       system console. All messages are formatted in the following manner:

       WARNING: <device path> (ehci<instance number>): Message...

       Unrecoverable USB hardware error.

	   There  was an unrecoverable USB hardware error reported by the ehci
	   controller. Reboot the system. If this  problem  persists,  contact
	   your system vendor.

       No SOF interrupts.

	   No  SOF  interrupts have been received. This USB EHCI controller is
	   unusable.

       Error recovery failure: Please hotplug the 2.0 hub at <device path>.

	   The driver failed to clear 2.0 hub's TT buffer. Remove and reinsert
	   the external USB2.0 hub.

       Revision<xx> is not supported.

	   High speed USB devices prior to revision 0.95 are not supported.

       The  following  messages	 may  be entered into the system log. They are
       formatted in the following manner:

       <device path> (ehci<instance number>): Message...

       Unable to take control from BIOS. Failure is ignored.

	   The driver was unable to take control of the EHCI hardware from the
	   system's BIOS. This failure is ignored. To abort the attach on this
	   take-over failure, comment out a property in ehci.conf. (x86 only).

       Unable to take control from BIOS.

	   The	driver	is  unable  to	take  control  of  the	EHCI  hardware
	   from	 the system's BIOS and aborts the attach. High speed (USB 2.0)
	   support is disabled. In this case, all USB devices run at  full/low
	   speed.  Contact  your  system vendor or your system administror for
	   possible changes in BIOS settings. You can disable  a  property  in
	   ehci.conf to ignore this failure. (x86 only.)

       Low speed device is not supported.
       Full speed device is not supported.

	   The	driver	detected  a  low  or full speed device on its root hub
	   port. Per USB 2.0 specification, the device should be routed	 to  a
	   companion host controller (OHCI or UHCI). However, no attached com‐
	   panion host controller appears to be available. Therefore, low  and
	   full speed devices are not supported.

       Low speed endpoint's poll interval of <n> ms is below threshold. Round‐
       ing up to 8 ms.

	   Low speed endpoints are limited to polling intervals between	 8  ms
	   and	255  ms.  If  a device reports a polling interval that is less
	   than 8 ms, the driver uses 8 ms instead.

       Low speed endpoint's poll interval is greater than 255 ms.

	   The low speed device's polling interval is out of range.  The  host
	   controller does not allocate bandwidth for this device. This device
	   is not usable.

       Full speed endpoint's poll interval must be between 1 and 255 ms.

	   The full speed device's polling interval is out of range. The  host
	   controller does not allocate bandwidth for this device. This device
	   is not usable.

       High speed endpoint's poll interval must be between 1 and 16 units.

	   The high speed device's polling interval is out of range. The  host
	   controller will not allocate bandwidth for this device. This device
	   will not be usable. Refer to the USB	 specification,	 revision  2.0
	   for the unit definition.

       ehci_modify_qh_status_bit: Failed to halt qh=<address>.

	   Error  recovery  failed. Please disconnect and reinsert all devices
	   or reboot.

       Note -  Due to recently discovered incompatibilities with this USB con‐
	       troller,	 USB2.x	 transfer  support has been disabled. However,
	       this device continues  to  function  as	a  USB1.x  controller.
	       Information  on enabling USB2.x support is provided in this man
	       page. Please refer to www.sun.com/io for Solaris Ready products
	       and  to	www.sun.com/bigadmin/hcl for additional compatible USB
	       products.

	       VIA chips may not be compatible with this driver. To bind  ehci
	       specifically  to	 the  chip  and eliminate the warnings, and to
	       enable USB2.x suppport,	a  new,	 more  specific	 driver	 alias
	       (refer to add_drv(1M) and update_drv(1M)) must be specified for
	       ehci. By default, the ehci alias is 'pciclass,0c0320.' The com‐
	       patible	names  in  the	prtconf(1M) output provides additional
	       aliases. For example:

	  # prtconf -vp | grep pciclass,0c0320
	       compatible: 'pci1106,3104.1106.3104.2063' +
       'pci1106,3104.1106.3104' + 'pci1106,3104' +
	pci1106,3104.2063' + 'pci1106,3104' + 'pciclass,0c0320' +
       'pciclass,0c03'
		....

	      A more specific alias is 'pci1106,3104.' Perform the follow-
	      ing step to add this alias, then reboot the system:

	      # update_drv -a -i '"pci1106,3104"' ehci

	      # reboot

       After you apply the above workaround, the  following  message  is  dis‐
       played in your system log:

       Applying VIA workarounds.

SunOS 5.10			 13 April 2006			      ehci(7D)
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