2012/2/19 Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>: > On Sat, 18 Feb 2012, Wizard wrote: > >> All >> >> I am reading the OHCI specification( seems a little bit old). > > Yes, it is old. The current version dates back to 1999. The UHCI spec > is even older (1996). These two are version 1.0 and 1.1, I think. EHCI is for 2.0, right? > >> In Section 4.2, Endpoint Descriptor Format, there is the EN and FA in DWORD0. >> >> So these two combined forms the Endpoint address right? > > Well, they form the address that the hardware has to use in order to > send a packet to the endpoint. That's not what we usually mean when we > talk about the "endpoint address". > >> While this is the hardware address, not visible in driver? > > I don't understand your question. Of course these fields are visible > to the driver. If the ohci-hcd driver didn't set these fields > correctly, the hardware wouldn't work. > Thanks Alan. Yes the ohci-hcd driver know this, while the usb device, such as keyboard mouse, use this address format? > Alan Stern > -- Wizard -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
