Part Number: AM5728
Tool/software: Linux
We are using an AM5728 based SOM on a custom carrier board. We are using kernel 4.4.41. In approximately 1.2% of our power-ups, we see the following problem with UART6 (/dev/ttyS5) output:
1. Attach analyzer to serial output.
2. $echo "1234" > /dev/ttyS5
3. Observe the following output on the serial port: "2314" and sometimes "2134". This problem is persistent once it occurs. We have tried two different baud rates (115.2Kb/sec and 921.6Kb/sec)
We have identified a work-around: if we echo 67 characters to the tty, the problem clears. This looks like a FIFO pointer problem somewhere that only gets cleared by overfilling the FIFO.
Please advise.
