AMI BIOS UTILITY
CPB8926
3.4.6
USB
Configuration
USB
configuration
parameters
Legacy
USB
Support
Enables
Legacy
USB
support.
AUTO
option
disables
legacy
support
if
no
USB
devices
are
connected.
DISABLE
option
will
keep
USB
devices
available
only
for
EFI
applications.
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
The
time
‐
out
value
for
Control,
Bulk,
and
Interrupt
transfers.
USB
reset
time
‐
out
USB
mass
storage
device
start
unit
command
time
‐
out
Device
reset
time
‐
out
USB
mass
Storage
device
start
Unit
command
time
‐
out.
Device
power
‐
up
delay
Maximum
time
the
device
will
take
before
it
properly
reports
itself
to
the
Host
Controller.
‘Auto’
uses
default
value:
for
a
Root
port
it
is
100ms,
for
a
Hub
port
the
delay
is
taken
from
Hub
descriptor.
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