USB - added a configurable delay to the probe process as a workaround for OLPC trac 1473: ok setenv usb-delay 3000 \ 3000 milliseconds, i.e. 3 seconds ok probe-usb
cpu/x86/pc/olpc/usb.fth
dev/usb2/hcd/control.fth
dev/usb2/hcd/ehci/probe.fth