Hi Alan, Is there a way to determine if your host controller supports the "device" mode? I was trying to give a generic solution that would work for any given set of host controllers. Pete -----Original Message----- From: Alan Stern [mailto:stern@xxxxxxxxxxxxxxxxxxx] Sent: Tuesday, April 10, 2012 10:23 AM To: Brink, Peter Cc: Anil Nair; Greg KH; John Freeman; linux-usb@xxxxxxxxxxxxxxx Subject: RE: USB 3.0 A-to-A On Tue, 10 Apr 2012, Brink, Peter wrote: > It's not that you cannot do it, you just have to have a blob or dongle > in the middle that is going to do the client work for both sides. > It's a little more complicated solution, since you have to have an > object that can communicate with two hosts. I have not researched > A-to-A cables, but I know that they exist and have been used for that > purpose. The warnings on the following link apply: This is not entirely correct. Section 5.5.2 of the USB-3.0 specification (USB 3.0 Standard-A to USB 3.0 Standard-A Cable Assembly) says: The USB-3.0 Standard-A to USB-3.0 Standard-A cable assembly is defined for operating system debugging and other host-to-host connection applications. Table 5-10 then defines the appropriate pin connections, in which the TX pair on each end is wired directly to the RX pair on the other end. There does not need to be any "blob" or dongle in the middle of the cable. Some host controllers have the capability to communicate directly with each other. Alan Stern -- 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
