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Full Discussion: Unload kernel module at boot time (Debian Wheezy 7.2, 3.2.0-4-686-pae kernel)
Operating Systems Linux Unload kernel module at boot time (Debian Wheezy 7.2, 3.2.0-4-686-pae kernel) Post 302881758 by gacanepa on Wednesday 1st of January 2014 01:21:07 PM
Old 01-01-2014
Unload kernel module at boot time (Debian Wheezy 7.2, 3.2.0-4-686-pae kernel)
Hi everyone,
I am trying to prevent the ehci_hcd kernel module to load at boot time.
Here's what I've tried so far:
1) Add the following line to /etc/modprobe.d/blacklist.conf (as suggested here):
Quote:
blacklist ehci_hcd
2) Blacklisted the module by adding the following string to
Quote:
GRUB_CMDLINE_LINUX_DEFAULT="quiet modprobe.blacklist=ehci_hcd"
3) Tried to blacklist the module by adding the following line to /etc/modprobe.d/blacklist (without the .conf):
Quote:
blacklist ehci_hcd
After trying each step I updated the boot image with
Quote:
dpkg-reconfigure linux-image-$(uname -r)
and rebooted, each time to no use.
I've also removed the module with
Quote:
modprobe -r ehci_hcd
but as you know, that will only unload the module until next reboot.
The reason why I want to do this is because I am suspecting that module is responsible for crashing a RAID1 device composed of 2 8 GB USB drives connected to a PCI 4-port USB 2.0 hub in an old home server that only has USB 1.1 onboard ports available (I added the PCI hub in hopes that I could use the flash drives at USB 2.0 speeds). Maybe the hardware itself isn't capable of handling USB 2.0? Please correct me if my reasoning is faulty.
Any hints or suggestions will be more than welcome.

---------- Post updated 01-01-14 at 03:21 PM ---------- Previous update was 12-31-13 at 10:42 PM ----------

Just in case someone finds it helpful, here's how I solved the issue: [SOLVED] Unload kernel module at boot time (Debian Wheezy 7.2, 3.2.0-4-686-pae kernel)
 

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LEARN ABOUT FREEBSD

usb_template

USB_TEMPLATE(4) 					   BSD Kernel Interfaces Manual 					   USB_TEMPLATE(4)

NAME

     usb_template -- USB templates

SYNOPSIS

     To compile this module into the kernel, place the following line in your kernel configuration file:

	   device usb_template

     To load the module at boot time, place the following line in loader.conf(5):

	   usb_template_load="YES"

DESCRIPTION

     The usb_template module implements various USB templates that are needed when programming an USB device side driver.  A USB template consists
     of an USB device descriptor, one or more USB configuration descriptors, one or more USB interface descriptors, one or more USB endpoint
     descriptors, USB strings and additional USB descriptors.  The USB template module currently has templates for USB Mass Storage, USB CDC Eth-
     ernet and Message Transfer Protocol.  USB templates are currently selected using the "hw.usb.template" sysctl.  The "hw.usb.template" value
     can be changed at any time, but will not have any effect until the USB device has been re-enumerated.

SEE ALSO

     usb(4)

STANDARDS

     The usb_template module complies to the USB 1.0, 2.0 and 3.0 standard.

HISTORY

     The usb_template module was written by Hans Petter Selasky <hselasky@FreeBSD.org>.

BSD
								  March 18, 2014							       BSD
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