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More information about UART: [http://en.wikipedia.org/wiki/Universal_asynchronous_receiver/transmitter <span style="text-decoration: underline;">here</span>] and [[How to use UARTs|here]].'''<br>'''
There are three modes to configure UART2 in J990: via user space (first way), editing only igep.ini (second way) or editing kernel source and compile it (third way).
= Feedback and Contributing =
At any point, if you see a mistake you can contribute to this How-To.<br>
= Fast ModeFirst way<br> =
Fast Mode: the problem of this mode is when your system reboot or halt you will need to configure again, but you configure four UART wires in J990. Using user space to configure mux and disable bluetooth. Default kernel has disabled TWL4030 PCM voice interface output pins to high impedance, otherwise this module forces the level of mcbsp3_fsx and mcbsp3_clkx pins. To make sure, go to ~/sound/soc/codecs/twl4030.c file already read: <br>
Mode will be 1 (uart mode)
= Faster Mode Second way<br> =
Faster mode: configure kernel via IGEP Xloader. Configuration will be permanent.
<pre>buddy=igep0022
buddy.modem=yes </pre>
= Slow ModeThird way (under construction) =
Slow mode: configure kernel source.<span lang="en" classid="short_textresult_box" idclass="result_boxshort_text"><span class="hps">Configuration will be</span> <span class="hps">permanent.</span></span>
=== Configure IGEP ===
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[[Image:Uart2 igepv2 j990 connector.png|800x500px]]
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[[Category:Communications]] [[Category:How_to_forge]] [[Category:Tutorials]]
