My machine in the house has all three loaded;
[denise] ~ > lspci -vvv | grep HCI
00:0a.0 USB Controller: NEC Corporation USB (rev 41) (prog-if 10 [OHCI])
00:0a.1 USB Controller: NEC Corporation USB (rev 41) (prog-if 10 [OHCI])
00:0a.2 USB Controller: NEC Corporation USB 2.0 (rev 02) (prog-if 20
[EHCI])
00:11.2 USB Controller: VIA Technologies, Inc. USB (rev 18) (prog-if 00
[UHCI])
[denise] ~ > usbtree
/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=usb-uhci/2p, 12M
/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=ehci-hcd/5p, 480M
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=usb-ohci/2p, 12M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=usb-ohci/3p, 12M
The USB2 card has five ports. Three ports have one OHCI controller
and the other two posts have another OHCI controller. THe onboard USB is
UHCI.
Anyway, if Rainer tries "rmmod ehci-hcd" he will be able to test
is device with the USB1 driver. Of course this means he won't get the
benefit of the extra speed with USB2.
regards,
Stephen.
On Wed, 17 Sep 2003, Ged Haywood wrote:
> Hi there,
>
> On Wed, 17 Sep 2003, Rainer Krienke wrote:
>
> > So if I understand things right I could try to exchange the usb-uhci module by
> > the uhci module?
>
> Yes.
>
> > I still cannot classify the different modules: There are chipset dependent
> > drivers like Cyriac Benoit said: ohci, uhci and usb-uhci. Ok. Then there is
> > the ehci driver (ehci-hcd module). Is this driver number 4 in the sequence of
> > chipset drivers or does it serve a different purpose and relies on any of the
> > ohci, uhci or usb-uhci drivers?
>
> The ohci, uhci and usb-uhci drivers are for USB1.1. They use other
> modules like usbcore but they are independent of each other. OHCI and
> UHCI are two different specifications for interfaces to USB devices
> and have completely different approaches to doing the same thing.
> Only one of them will usually be loaded, depending on your chipset.
>
> If you have a motherboard chipset which requires, say, ohci and a PCI
> card which requires uhci or usb-uhci I suppose you might want to load
> two of them, but I've never seen it done.
>
> The ehci-hcd driver is for USB 2.0 and has nothing to do with the 1.1
> drivers. This is in the documentation on the linux-usb.org website,
> which you should take the time to read.
>
> 73,
> Ged.
>
>
>
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