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!colspan="4" style="width:100%; text-align:left"; border-bottom:solid 2px #ededed"|History
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<section end=History/>
__FORCETOC__
<section begin=Body/>
The following commands have been used in order to configure the system. The command <code>ifconfig eth0 down</code> disables processor's Ethernet controller and puts the external PHY in power-down mode.
<pre>
#!/bin/bash
echo 0 > /sys/class/gpio/gpio84/value
</pre>
The system automatically enters to and exits from system idle mode when needed:
<pre>
</pre>
It is worth to remember that the use of <code>powersave</code> governor '''has a drawback in terms of system reactivity''', because processor is relatively slow to get out of the idle condition. This can lead to phenomena such as the UART RX FIFO overrun, as shown in the following box{{efn|This is the same issue described [[Linux_and_interrupt_latency_(Axel)#A_real-word_case:_UART_RX_FIFO_overrun|here]].}}. In this example, a relatively long command string has been pasted into the serial console terminal:
<pre>
root@sbc-lynx:~# imx-uart 2020000.serial: Rx FIFO overrun
[2] Ethernet PHY supports several power-management modes. The most aggressive is the ''slow-oscillator mode''. At the time of this writing, Linux kernel does not support this mode. The ''power-down mode'' is used instead. If ''slow-oscillator mode'' were implemented, about 7mW would be spared.
<section end=Body/>
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[[Category:AXEL ULite]]