On 23.02.2012 14:25, Lamar Owen wrote:

On Wednesday, February 22, 2012 09:52:54 AM Volker Poplawski wrote:

...

Hi all,

I'm booting Centos6 from a usb 3.0 stick.

This works fine as long as the usb-stick is connected to a usb 2.0 port. Once I plug the the usb-stick into a blue usb 3.0 port centos fails on mounting the root filesystem.

Any hints on that?

Which version of CentOS? 6.0, 6.1, or 6.2? Which kernel?

USB3 support isn't as robust as it should be, prior to 6.2, but I've not tried booting with USB3.0.

Hi Lamar.

Centos 6.2 x86_64, 2.6.32-220

Got the problem (partialy) solved.

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? OpenSuse offers a setting called INITRD_MODULES="..." in /etc/sysconfig which is used by mkinitrd. Is there something similar in Centos?

Regards ....Volker

On Wednesday 29 February 2012 06.07.03 John Doe wrote:

From: Volker Poplawski volker@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