I don't get it. I mean the sense of the "BIOS EHCI Hand-Off" entry in some BIOSes. XP/Vista take over control over EHCI. Period. That's what sounds logical and what everyone would think, isn't it, wouldn't you.
But why did Microsoft then release a statement (longer time ago), that xp SP2 introduces a preliminary(!) EHCI hand-off from BIOS?? Why wasn't it there long before xp SP2 and xp in general? Is the EHCI hand-off final in Vista or still "preliminary"??
Is the "EHCI Handoff" BIOS entry a workaround then, and pre-sp2 xp only works with USB2.0 devices because that workaround has been implemented and hidden in several BIOS generations??
As said, I don't get this at all...