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Arcom Embedded Linux Technical Manual Configuring AEL

Example configuration

For a node that is connected to the ABC-Wireless-Network using encryption and

obtaining its IP information via DHCP, the following /etc/network/interfaces stanza might

be used:

iface wlan0 inet dhcp

wireless_mode managed

wireless_essid ABC-Wireless-Network

wireless_channel 11

wireless_enc restricted

wireless_key1 893248A248B9443FC00D423090

Configuring and loading kernel modules

The Linux kernel supports configuring and loading device drivers as external modules.

This means much of the system need only be resident in RAM when necessary.

Modules are loaded using the modprobe utility, which in turn calls the lower level

insmod utility. You need not normally call either of these utilities manually, since the

kernel automatically calls modprobe when it is asked to open a device for which no

module is currently loaded. The modules that are available via modprobe on the current

system are usually found in the /lib/modules/VERSION/ folder corresponding to the

running kernel.

You can load a module that is installed in the /lib/modules/VERSION/ folder by calling

modprobe with just the module name and without the .o suffix. For example, to load the

ppp_generic.o module, which is installed under /lib/modules/VERSION/, enter the

following command:

# modprobe ppp_generic

Modules can be loaded from elsewhere by using the insmod utility directly and giving a

full path to the module. For example, to load the module /tmp/mymodule.o, enter the

following:

# insmod /tmp/mymodule.o

You can view the list of currently loaded modules using the command lsmod.

Passing parameters to modules

Many kernel modules can take parameters that allow you to tweak various options. The

available parameters (along with other interesting information) can be listed using the

modinfo utility, as follows:

# modinfo ppp_generic

# modinfo /tmp/mymodule.o

In many cases, the parameters of a particular module are documented more fully within

the kernel source tree.

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