EHCI(4D) Devices EHCI(4D)
NAME
ehci - Enhanced host controller driver
SYNOPSIS
usb@unit-addressDESCRIPTION
The
ehci driver is a USBA (Solaris USB Architecture) compliant nexus
driver that supports the Enhanced Host Controller Interface
Specification 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 controllers. (OHCI or UHCI host controller).
The
ehci supports bulk, interrupt, control and isochronous transfers
(on USB1.
x devices behind a USB2.0 hub).
FILES
/kernel/drv/sparcv9/ehci Device driver (SPARC)
/kernel/drv/amd64/ehci Device driver (x86)
/kernel/drv/ehci.conf Driver configuration file
ATTRIBUTES
See
attributes(7) for descriptions of the following attributes:
+---------------+-------------------------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+-------------------------------+
|Architecture | SPARC, x86, PCI-based systems |
+---------------+-------------------------------+
SEE ALSO
hubd(4D),
ohci(4D),
uhci(4D),
usba(4D),
attributes(7),
add_drv(8),
prtconf(8),
rem_drv(8),
update_drv(8) 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.intel.com/technology/usb/ehcispec.htmDIAGNOSTICS
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
administrator 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
companion 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. Rounding 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
controller, 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.
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 support, a new, more specific driver alias (refer to
add_drv(8) and
update_drv(8)) must be specified for
ehci. By
default, the
ehci alias is 'pciclass,0c0320.' The compatible names
in the
prtconf(8) 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
displayed in your system log:
Applying VIA workarounds.
January 10, 2020 EHCI(4D)
