Chapter 41.
559
General Parameters and Modules
This chapter is provided to illustrate
some
of the possible parameters available for common hardware
device
drivers
1
, which under Red Hat Enterprise Linux are called kernel
modules
. In most cases,
the default parameters do work. However, there may be times when extra module parameters are
necessary for a device to function properly or to override the module's default parameters for the
device.
During installation, Red Hat Enterprise Linux uses a limited subset of device drivers to create a stable
installation environment. Although the installation program supports installation on many different
types of hardware, some drivers (including those for SCSI adapters and network adapters) are not
included in the installation kernel. Rather, they must be loaded as modules by the user at boot time.
Once installation is completed, support exists for a large number of devices through kernel modules.
Important
Red Hat provides a large number of unsupported device drivers in groups of packages
called
kernel-smp-unsupported-
<kernel-version>
and
kernel-hugemem-
unsupported-
<kernel-version>
. Replace
<kernel-version>
with the version
of the kernel installed on the system. These packages are not installed by the Red Hat
Enterprise Linux installation program, and the modules provided are not supported by Red
Hat, Inc.
41.1. Kernel Module Utilities
A group of commands for managing kernel modules is available if the
module-init-tools
package
is installed. Use these commands to determine if a module has been loaded successfully or when
trying different modules for a piece of new hardware.
The command
/sbin/lsmod
displays a list of currently loaded modules. For example:
Module Size Used by
tun 11585 1
autofs4 21573 1
hidp 16193 2
rfcomm 37849 0
l2cap 23873 10 hidp,rfcomm
bluetooth 50085 5 hidp,rfcomm,l2cap
sunrpc 153725 1
dm_mirror 29073 0
dm_mod 57433 1 dm_mirror
video 17221 0
sbs 16257 0
i2c_ec 5569 1 sbs
container 4801 0
button 7249 0
battery 10565 0
asus_acpi 16857 0
ac 5701 0
ipv6 246113 12
A driver is software which enables Linux to use a particular hardware device. Without a driver, the kernel cannot communicate
with attached devices.
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