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XFCE Desktop Environment

The Reference Operating System for IoT build includes the XFCE library to provide the following services:

  • Windows manager
  • Desktop manager
  • Panel
  • Session manager
  • Application finder
  • File manager
  • Setting manager

By default, XFCE automatically launches when the OS boots. XFCE also supports additional components such as remote display server.

Wi-Fi Firewall via iptables

The platform supports iptables firewall. This service is automatically started at boot time and loads a set of default rules from /usr/share/iptables-settings/iptables.rules

The rules can be changed and saved to the configuration file via the commands shown below:

Common Commands

To clear all existing rules:


When developers compile, build, and run their applications, they may encounter runtime errors or other problems. There are several methods to debug different issues on the compute module.

Additional debug information can be found in these topics:

SPI Serial Peripheral

A 25-MHz SPI bus (SPI_1) is available on the J6 connector with three slave selects and another 25-MHz SPI bus (SPI_0) with two slave selects on the J7 connector. The bus speed is 25 MHz in master mode and 16.67 MHz in slave mode.

In a single-frame transfer, the SoC supports all four possible combinations for the serial clock phase and polarity. In multiple frame transfer, the Intel® Joule™ module supports only a clock phase setting of 1.

SPI bus usage example

Expansion Board Datasheet

This section describes the devices and circuitry on the expansion board (also known as the Development Kit) for the Intel® Joule™ compute module.

The expansion board is a development platform for prototyping and exploring application solutions powered by the Intel Joule module. As such, certain devices and features might not function, depending on the firmware installed, the operating system installed, and devices attached to ports and connectors.

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