On Wed, 28 Dec 2005, naveen kumar wrote: > Hi all, > > I have ehci host controller hardware with UHCI > companion controllers in my PC And I am running > linux-2.6.9.When I am starting my PC both ehci and > uhci host controller drivers are loaded.So If I > connect any low speed or full speed device uhci host > controller driver is taking care of that device. > > But I have a doubt that ehci should have an internal > port routing logic which will tell the companion > controllers to deal with the full speed or low speed > devices.
It _does_ have this internal port-routing logic. > If this is the case , then is it necessary > that uhci host controller driver is needed for those > companion controllers (or) the ehci driver code itself > is having the logic to talk to the low speed or full > speed devices. The EHCI driver handles only the EHCI controller. It does not drive the UHCI companion controller. > Does both the host controller drivers needed incase of > EHCI host controller? Yes, both drivers are needed unless you don't have any full- or low-speed devices. If you have only high-speed devices then you don't need the UHCI driver. Alan Stern ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click _______________________________________________ Linux-usb-users@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
