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bluetooth: update for xuelk-1.2.0 and use a warning message for older dev kit
===Bluetooth===
To enable Bluetooth interface, <code>gpio135</code> must be set to 1 first:<pre>root@sbc-lynx:~# echo 135 > /sys/class/gpio/exportroot@sbc-lynx:~# echo out > /sys/class/gpio/gpio135/directionroot@sbc-lynx:~# echo 1 > /sys/class/gpio/gpio135/value</pre>Then it It is possible to attach the physical device to [http://www.bluez.org/ BlueZ stack] and start using it via HCI tools: 
<pre>
root@sbc-lynx:~# hciattach -t 60 /dev/ttymxc1 texas 115200
00:02:72:C6:40:16 virt
</pre>
 
 
{{ImportantMessage|text=For XUELK 1.1.3 and below, to enable Bluetooth interface, <code>gpio135</code> must be set to 1 first
 
<pre>
root@sbc-lynx:~# echo 135 > /sys/class/gpio/export
root@sbc-lynx:~# echo out > /sys/class/gpio/gpio135/direction
root@sbc-lynx:~# echo 1 > /sys/class/gpio/gpio135/value
</pre>
 
}}
 
====Performance tests====
The following examples show two throughput performance tests, run at L2CAP layer. The connection has been established with a PC equipped with Bluetooth USB dongle Asus BT400.
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