FAQ

On Wednesday 29 February 2012 06.07.03 John Doe wrote:
From: Volker Poplawski <volker at openbios.org>
The required xhci_hcd kernel module is not part of the 260 modules in
the initrd for some reason. Sony Memory-Stick is included, if you happen
to have one of these...
I was able to rebuild the initrd plus the xhci_hdc module:
mkinitrd -v --with=xhci_hdc
/boot/initramfs-2.6.32-220.4.2.el6.x86_64.img `uname -r`
Now, how do I tell centos to add the module everytime a new kernel is
installed/updated?
Isn't mkinitrd looking at /etc/modprobe.conf?
Or is it only limited to fs, ide/scsi and raid modules?
Let me try to unconfuse this situation:

1) CentOS-6 does not use initramfstools, mkinitrd is just a thin shell wrapper
on top of dracut

2) dracut by default adds lots of drivers to the initramfs (not only what's
needed, that is, -H is not the default)

3) dracut does not include *hci_hcd modules since ehci, uhci and ohci are
built in, not compiled as modules (this could be considered a bug...).

4) you spelled the driver wrong above, it's xhci_hcd not hdc

To conclude, to build a new initramfs for the current kernel with dracut:

dracut --add-drivers xhci_hcd /boot/initramfs-$(uname -r).img $(uname -r)

To make it permanent look at the add_drivers line in /etc/dracut.conf or add a
/etc/dracut.conf.d/...

/Peter
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