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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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KLDLOAD(8)						    BSD System Manager's Manual 						KLDLOAD(8)

NAME
kldload -- load a file into the kernel SYNOPSIS
kldload [-nqv] file ... DESCRIPTION
The kldload utility loads file.ko into the kernel using the kernel linker. Note that if multiple modules are specified then an attempt will be made to load them all, even if some fail. The .ko extension name is not mandatory when loading a given module using kldload. It does not hurt to specify it though. If a bare filename is requested it will only be loaded if it is found within the module path as defined by the sysctl kern.module_path. To load a module from the current directory it must be specified as a full or relative path. The kldload utility will warn if a module is requested as a bare filename and is present in the current directory. The following options are available: -n Do not try to load module if already loaded. -v Be more verbose. -q Silence any extraneous warnings. NOTES
The kernel security level settings may prevent a module from being loaded or unloaded by giving Operation not permitted. FILES
/boot/kernel directory containing loadable modules. Modules must have an extension of .ko. EXIT STATUS
The kldload utility exits 0 on success, and >0 if an error occurs. EXAMPLES
To load by module name: > kldload foo To load by file name within the module path: > kldload foo.ko To load by relative path: > kldload ./foo.ko To load by full path: > kldload /boot/kernel/foo.ko AUTOMATICALLY LOADING MODULES
Some modules (pf, ipfw, ipf, etc.) may be automatically loaded at boot time when the corresponding rc.conf(5) statement is used. Modules may also be auto-loaded through their addition to loader.conf(5). SEE ALSO
kldload(2), loader.conf(5), rc.conf(5), security(7), kldconfig(8), kldstat(8), kldunload(8) HISTORY
The kldload utility first appeared in FreeBSD 3.0, replacing the lkm interface. AUTHORS
Doug Rabson <dfr@FreeBSD.org> BSD
March 18, 2012 BSD
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