I have found a solution backporting the imx serial driver from mainline kernel 3.18.31 (drivers/tty/serial/imx.c from kernel.org). I have replaced imx.c from toradex imx6 3.14.28 kernel, recompile it and the Rx Fifo Overrun error is seemed to be solved, such as I have not observed it again in syslog doing some tests.
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