Usb configuration, 6 usb configuration, Legacy usb support – ADLINK aTCA-6250 User Manual
Page 62: Ehci hand-off, Usb transfer time-out, Device reset time-out, Device power-up delay
62
6.3.6 USB
Configuration
Legacy USB Support
Legacy USB support refers to USB mouse and keyboard support. If this option is not
enabled, any attached USB mouse or keyboard will not become available until a USB
compatible operating system is fully booted with all USB drivers loaded. When this
option is enabled, any attached USB mouse or keyboard can control the system even
there is no USB driver loaded on the system.
EHCI Hand-off
This is a workaround for OSes without EHCI hand-off support. The EHCI ownership
change should be claimed by EHCI driver.
USB transfer time-out
This item specifies the timeout in seconds for USB control, bulk, and interrupt
transfers.
Device reset time-out
This item specifies the number of seconds that system boot will wait for a USB mass
storage device to start.
Device power-up delay
This item specifies the maximum time that USB device will take before it reports itself
properly to the USB host controller. “Auto” uses the default value: for a root port, it is
100ms, for a Hub port, the delay is taken from Hub descriptor.