devu-hcd-xhci.so

Updated: May 06, 2022

Driver for eXtensible Host Controller Interface (xHCI) USB controllers

Note: You must be root to start this manager.

Syntax:

io-usb-otg -d xhci [option[,option...]] ... &

Runs on:

QNX Neutrino

Options:

ioport=addr
Register the base address of the USB controller. The default is to scan the PCI bus.
irq=num
The interrupt request number.
memory=name
Use the specified typed memory for DMA descriptors (endpoint descriptor, transfer descriptors, and so on). The default is /memory/below4G.
nosmm
Don't disable system management. The default is to disable it.
nousb3
Don't enable USB 3 mode.
pindex=num
The instance of the controller on the PCI bus to apply subsequent options to. The value starts from 0.
prio=num
Set the pulse-handler thread's priority (default 21).
soft_retries=num
xHCI driver retries failed transfers num times ( default 0).
soft_retries_mask=num
Select endpoint types that use soft retries ( default 0xd ). The bit masks include:
  • CONTROL EP = 0x1 On by default
  • ISOCH EP = 0x2 Not Allowed!
  • BULK EP = 0x4 On by default
  • INT EP = 0x8 On by default
verbose=num
Set verbosity.

Description:

The devu-hcd-xhci.so server provides support for computers that have eXtensible Host Controller Interface (xHCI) USB controllers. This server creates the /dev/usb/devu-hcd-xhci.so device.

Note:
  • If you specify options, you must include a pindex option for all controllers you wish to use.
  • The devu-hcd-xhci.so server supports superspeed plus, superspeed, high, full, and low speeds.
  • The current implementation doesn't support secondary streams (which is an XHCI rather than a USB feature). This usually isn't a problem because most hardware boards support a sufficient number of primary streams.

Examples:

Scan the PCI bus for all available controllers:

io-usb-otg -dxhci 

Attach to the first and third controller instances and set the verbose option on the first controller instance as follows:

io-usb-otg -dxhci pindex=0,verbose=4,pindex=2 &