Hi Alan, I have one more doubt about host controller hardware.If there is an ehci host controller present in a system , then it will have its own implementation specific registers.Does the same ehci host controller hardware also includes the register set of companion host controllers also.Because uhci (or) ohci drivers operate on the different set of registers than ehci register set.I confirmed this by checking /proc/iomem for ehci & /proc/ioports for uhci.
Naveen.M --- naveen kumar <[EMAIL PROTECTED]> wrote: > Thanks Alan. > > Naveen.M > > --- Alan Stern <[EMAIL PROTECTED]> wrote: > > > 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 > > > > > > > Send instant messages to your online friends > http://in.messenger.yahoo.com > Send instant messages to your online friends http://in.messenger.yahoo.com ------------------------------------------------------- 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 _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
