On Monday 22 of February 2010 10:00:53 Robby Workman wrote: > On Mon, 22 Feb 2010 09:42:31 +0300 > > Andrey Borzenkov <arvidjaar@xxxxxxx> wrote: > > ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver > > Warning! ehci_hcd should always be loaded before uhci_hcd and > > ohci_hcd, not after > > > > [snipped] > > > > So my question is - is the warning still true? How serious problems > > can result if uhci is loaded before ehci? > > > > Does it make sense to workaround it in udev or may be trivial > > > > install uhci_hcd mdprobe ehci_hcd; modprobe --ignore-install > > uhci_hcd > > > > would be enough? > > That's basically what we did: > > $ cat /etc/modprobe.d/usb-controller.conf > # Make sure that ehci-hcd is always loaded before uhci-hci > # # or ohci-hcd to prevent a kernel warning: > install uhci-hcd /sbin/modprobe ehci-hcd ; /sbin/modprobe -i uhci-hcd > install ohci-hcd /sbin/modprobe ehci-hcd ; /sbin/modprobe -i ohci-hcd > The problem is this dependency strikes back in other places as well. E.g. I want to find out drivers for my USB keyboard to be loaded in initrd. Natural way is to walk up device tree collecting them - which leaves me with uhci (or ohci). Now I must manually do not forget to put in ehci, although strictly speaking I do not need it (in initrd) at all. Kernel based solution would really be nice ...
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