Problem to setup XBee on UART4 with DeviceTrees on BBB

Hello,
I want to use a XBee Modul (XBEE Pro 868) on a BeagleBone Black with Kernel 3.8.13.

I’ve configured my DeviceTree with this fragments:

`

fragment@1 { target = <&am33xx_pinmux>; overlay {
pinctrl_uart4_pins: pinmux_uart4_pins {
pinctrl-single,pins = <
/** UART4: XBEE */
0x070 0x26 /
P9_11, MODE6, UART4_RXD /
0x074 0x06 /
P9_13, MODE6, UART4_TXD /
0x0d4 0x06 /
P8_33, MODE6,RTS,INPUT /
0x0d0 0x26 /
P8_35, MODE6,CTS,OUTPUT */

;
};

};
};

fragment@3 {
target = <&uart5>; /* this is UART4… */
overlay {
status = “okay”;
pinctrl-names = “default”;
pinctrl-0 = <&pinctrl_uart4_pins>;
fsl,uart-has-rtscts;
};
};

`

I’ve tested the connection with minicom (minicom -b 9600 -D /dev/ttyO4) but nothing happend. (I’ve followed the Introduction on http://www.jerome-bernard.com/blog/2012/06/04/beaglebone-serial-ports-and-xbees/ for the normal beaglebone)

Can somone tell me thats wrong?

Best regards