The ghost kernel module - ehci-hcd

[smelialichu]

In order to get my Creative Zen Xtra to work, I modified my kernel config to disable compiling of ehci, so that my Xtra would be forced on to the ohci bus on my nforce motherboard, and forced in to USB 1.1 mode (I don't know why, but works!). This works great, as long as I run rmmod ehci-hcd every time I reboot, you see lsmod lists ehci-hcd as a loaded module:
ehci-hcd 14944 0 (unused)

However, find /lib/modules/ -name 'ehci-hcd.o' yields no results and if I modprobe ehci-hcd I get modprobe: Can't locate module ehci-hcd. I can't fathom what is going on here? I find this in my /var/log/messages, which occurs each time I boot:
Feb 19 14:36:09 faifbox ehci_hcd 00:02.2: nVidia Corporation nForce2 USB Controller
Feb 19 14:36:09 faifbox ehci_hcd 00:02.2: irq 5, pci mem e0826000
Feb 19 14:36:09 faifbox ehci_hcd 00:02.2: USB 2.0 enabled, EHCI 1.00, driver 2003-Jun-19/2.4

If I plug in my Zen Xtra without rmmod'ing ehci-hcd, /var/log/messages tells me a usb device has been connected but /proc/bus/usb/devices doesn't list it (It also doesn't list my ehci hub, which is what I'd expect). However, if I rmmod ehci-hcd and then connect my Xtra, everything works great, it's put on the usb-ohci bus and although transfers are a little slow - they work

I'm running kernel 2.4.22-gentoo-r5. Does anyone have any idea where this ehci-hcd module is coming from? If you need any more information, just ask. Thankyou

[smelialichu]

^bump^

Nobody have any ideas where this ehci-hcd module can possibly be appearing from?

[ronmon]

Try this:

Code: Select all

find /lib/modules/ -iname 'ehci*'

In a 2.6 kernel, the module is named ehci-hcd.ko but shows up in lsmod as ehci_hcd (an underscore vs. a hyphen). Can't remember how the 2.4.x kernels name them except that they changed from *.o to *.ko.

I have both ohci and ehci modules and several USB devices. The 1.1 capable stuff uses the ohci and the two 2.0 drives use the ehci automatically. If yours isn't woking that way and you don't have any USB 2.0 devices, you could just not build the ehci module. Or delete it from /lib/modules/[version] and run 'depmod -a'.

USB View screenie

[smelialichu]

Thankyou for your response - the command also gives no output. I disabled ehci in my kernel config (# CONFIG_USB_EHCI_HCD is not set) and recompiled and installed the new kernel and modules (it's a procedure I've done several times before - I'm certain there's no problem there). The reason I disabled ehci ronmon is so that my USB 2.0 Creative Zen Xtra is forced to use ohci (usb 1.1). I read from someone else on the forum who said the jukebox only worked with usb 1.1, so decided to do the same - and it works great now when I rmmod ehci_hcd.

I have no idea where this ehci_hcd is coming from, and when I'm loaded it simply blocks usb 2.0 devices (they don't show up in /proc/bus/usb/devices).

[ronmon]

You got me there. I don't know how you can load a module that doesn't exist.

Good luck.