Driver for Enhanced Host Controller Interface (EHCI) USB controllers
Note:
You must be root to start this driver.
Syntax:
io-usb-otg -d ehci [option[,option...]] &
Options:
- frame_list_size=num
- Set the size of the frame list: 1024 (the default), 512, or 256.
- int_retry=num
- Set the number of retries from within the interrupt handler for edge trigger interrupts.
The default is 4, and the value must be 0 or more.
- int_thresh=num
- Interrupt microframe threshold.
Valid values are 1, 2, 4, 8, 16, 32, and 64.
The default value is 8, which is a 1 ms interrupt rate. The chip
will interrupt after a 1 ms period (USB frame) if there are completed
transactions. Setting the value to 1 lets the chip interrupt
after 125 us (USB microframe) if there are completed transactions.
- ioport=addr
- Register the base address. 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.
- murb
- Allow multiple URB queues at the driver level (default: disabled).
- nosmm
- Don't disable system management. The default is to disable it.
- num_ed=num
- The number of endpoint descriptors to preallocate.
- num_itd=num
- The number of Isoch transfer descriptors to preallocate;
the default is to use the global transfer descriptors pool as specified by the num_td option.
Note:
You must specify the num_itd option after the ioport and
irq options.
- num_td=num
- The number of transfer descriptors to preallocate.
- pindex=num
- The instance of the controller on the PCI bus to apply subsequent options to.
The value starts from 0.
- soft_retries=num
- The number of software retries for transaction errors.
The default is 6.
- verbose=num
- Set the verbosity level.
Description:
The devu-hcd-ehci.so server provides support for
computers that have Enhanced Host Controller Interface (EHCI) USB controllers.
This server creates the /dev/usb/devu-hcd-ehci.so device.
Note:
If you specify options you'll need to include pindex options
for all controllers you wish to use.
Examples:
Scan PCI bus for all available controllers:
io-usb-otg -dehci
Attach to the 1st and 3rd controller instance and set the verbose
option on the 1st, as follows:
io-usb-otg -dehci pindex=0,verbose=4,pindex=2 &