The Familiar 0.4 distribution we have used has kernel version 2.4.3, and it has some packages for using IrDA. This packages are irda-common and irda-modules-2.4.3.rmk2-np1.
To install these packages you have to execute in the Compaq iPAQ the next:
After you should run depmod -ae because the irda-modules-2.4.3.rmk2-np1 pakage adds the modules we need to use IrDA in the Compaq iPAQ to the kernel. In this way, we have configured the Compaq iPAQ to use the infrared port. To enable it, you have to execute the following command:
ifconfig irda0 up; echo 1 >/proc/sys/net/irda/discovery
and to disable:
ifconfig irda0 down; echo 0 >/proc/sys/net/irda/discovery