XtratuM is an open source nanokernel (or better a picokernel) that goes beyond the classical ideas of nanokernels (www.xtratum.org).

Basically, XtratuM is just two simple device drivers: interrupt and timer. It can be used to replace the current HAL of RTLinux, avoiding the RTLinux patents, as far as we reckon.

The main features provided by this module are:

• Multiplexed multiple execution domains