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From IGEP - ISEE Wiki
→Configure UART1 and UART3 in IGEP with RS232 levels on J960 connector
<pre>board.ei485= yes
</pre>
UART1 is configured in RS232 driver, when igep line is replaced by (or type in -Maybe you don't found this line, replaced by or type this-):<br>
<pre>board.ei485= no
</pre>