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PPS51 is an Armadeus System's baseboard for the APF51 module. It can be used to implement and securize network applications such as routers and gateways.

File:PPS51 recto.jpeg
Front side, you can see dual Ethernet, USB 2.0 Host & OTG, WiFi Antenna, extension connector footprint and power supply
File:PPS51 verso.jpeg
Back side, with an APF51 module plugged-in


  • Please ask Armadeus support for details

Software features

There are some network applications/features that are preselected in the PPS baseboard default configuration:

Note Note: You can also use the PPS test scripts located in /usr/local/pps/scripts on the system to test some software functionalities.

Build informations

The following steps have to be performed to build a BSP for PPS51:

Armadeus 5.0 and later:

# make pps51_defconfig
# make

SSH terminal

The PPS51 filesystem is configured to enable SSH connection from a host computer. It allows you to access a system terminal through the default Ethernet port (the one aside USB Host connector).

  • The default connection informations are:
    • IP address:
    • Login: guest
    • Password: armadeus
  • Then you can connect to your system by running the following command on your host:
 $ ssh guest@

Debug / Development interface

  • In order to gain access to the serial port of the APF51 (U-Boot & Linux console), a small adapter cable has to be done.

A standard 2.54mm pin header connector (J5) allows accessing the TX and RX debug lines of the i.MX51. The signals are compatible with a the RS-232 standard (-12V/+12V) so no level translator is required when connecting it to your Host PC

The pinout is:

  • pin 1 (square pad): not connected
  • pin 2: TX line (processor side)
  • pin 3: RX line (processor side)
  • pin 4: GND

WiFi usage

On PPS51, WiFi/Libertas driver usage is a little bit different than on other platforms. Here are the things to know:

Drivers setup

You have to install Libertas SDIO and MMC drivers as modules to make Wi2Wi chipset work correctly on PPS (done by default):

$ make linux-menuconfig
Device drivers  --->
    [*] Network device support  --->
        Wireless LAN  --->
            [*] Wireless LAN (IEEE 802.11)
            <M>   Marvell 8xxx Libertas WLAN driver support
            < >     Marvell Livertas 8388 USB 802.11b/g cards
            <M>     Marvell Libertas 8385 and 8686 SDIO 802.11b/g cards
    <M> MMC/SD/SDIO card support  --->
              *** MMC/SD/SDIO Card Drivers ***
        <M>   MMC block device driver

Initializing the connection

Before creating the WiFi connection, you must load the Libertas SDIO and the MMC modules:

# sh /usr/local/pps/scripts/reset_wi2wi.sh

# modprobe mxcmmc
i.MX SDHC driver
mmc0: new SDIO card at address 0001

# modprobe libertas_sdio
lib80211: common routines for IEEE802.11 drivers
libertas_sdio: Libertas SDIO driver
libertas_sdio: Copyright Pierre Ossman
libertas_sdio mmc0:0001:1: firmware: requesting sd8686_helper.bin
libertas_sdio mmc0:0001:1: firmware: requesting sd8686.bin
libertas: 00:19:88:11:6b:d8, fw 9.70.3p36, cap 0x00000303
eth1 (libertas_sdio): not using net_device_ops yet
libertas: PREP_CMD: command 0x00a3 failed: 2
libertas: PREP_CMD: command 0x00a3 failed: 2
libertas: eth1: Marvell WLAN 802.11 adapter

Then all informations on Libertas_driver page apply.

Shutdown WiFi interface

You have to unload the MMC driver along with the Libertas SDIO if you want to completely shutdown the WiFi interface:

# ifconfig eth1 down
# rmmod mxcmmc
# rmmod libertas_sdio

Reset Wi2Wi

To reset the chipset, you have to toggle the Wi2Wi RESET GPIO (PE11), by calling this script:

# sh /usr/local/pps/scripts/reset_wi2wi.sh

Test scripts

You can find test scripts in PPS' filesystem to help you to test the PPS' functionalities. They are located in the directory /usr/local/pps/scripts but you can run them from any directory.

USB Gadget

Ethernet Gadget

  • File
    • test_ether_gadget.sh
  • No argument
  • Usage: test_ether_gadget.sh
  • Functionality: Activate an Ethernet connection interface on the system through the USB Gadget port.
  • Test: Try to ping the system from your host PC on

RS232 Gadget

  • File
    • test_rs232_gadget.sh
  • No argument
  • Usage: test_rs232_gadget.sh
  • Functionality: Enable a RS232 connection interface on the system through the USB Gadget port.
  • Test: Enter some datas or texts through /dev/ttyACM0 on your host PC. You should see the same datas displayed on the system.


  • File
    • test_ether_smsc95xx.sh
  • No argument
  • Usage: test_ether_smsc95xx.sh
  • Functionality: Create an Ethernet connection interface through the Ethernet SMSC95xx port.
  • Test: Try to ping the address on your host PC.


IWConfig (WEP)

  • File
    • test_wifi.sh
  • No argument
  • Usage: test_wifi.sh
  • Functionality: Create a Wifi connection interface with IWConfig (WEP encryption).
  • Test: Ping the address on your host PC.

Feature list

Wired communication

Wireless communication