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TDA4VM: Cannot setup a static IP

Part Number: TDA4VM

Hi, I tried to setup a static IP address for the board I have here using directly /etc/network/interfaces but I always fail without being able to identify where the network doesn't take this file into account. 

Here is my /etc/network/interfaces:

# /etc/network/interfaces -- configuration file for ifup(8), ifdown(8)
 
# The loopback interface
auto lo
iface lo inet loopback
 
# Wireless interfaces
iface wlan0 inet dhcp
        wireless_mode managed
        wireless_essid any
        wpa-driver wext
        wpa-conf /etc/wpa_supplicant.conf
 
iface tiwlan0 inet dhcp
        wireless_mode managed
        wireless_essid any
 
iface atml0 inet dhcp
 
# Wired or wireless interfaces
iface eth0
inet static
        address 10.129.56.17
        netmask 255.255.255.192
        gateway 10.129.56.1
 
iface eth1 inet dhcp
iface eth2 inet dhcp
iface eth3 inet dhcp
iface eth4 inet dhcp
 
# Ethernet/RNDIS gadget (g_ether)
# ... or on host side, usbnet and random hwaddr
iface usb0 inet dhcp
 
# Bluetooth networking
iface bnep0 inet dhcp

The static part only is about eth0 and we had before a DHCP server to handle the IPs for us. I tried to:

$ sudo ifconfig eth0 down
$ sudo ifconfig eth0 up

but it didn't change much, letting me think that maybe there is another file the network uses prior to /etc/network/interfaces maybe?