Ping Tai,
The UART transceiver on board (TMDSOSKL137) support 250 Kbps under typical condition. In your case it doesn’t work if the baud rate is programmed to 115200 bps that means 115.2 Kbps. So that is under transceiver speed limit.
Can you please let me know whether you’re not getting any data or you’re getting some garbage values? If that is the case try to reduce the baud rate and check it’s working with the lower baud rate.
Then Check the sampling mode (x16 or x13), SYSCLK2 frequency and the divisor value to meet the desired baud rate (115200) and cable.It should not be a problem with the controller or transceiver.
Try to run the sample UART test program from spectrum digital to confirm the UART is working the sample test will run at 115200 .I've checked it with my EVM ti's working.
If you want to run at 3 Mbps the maximum speed mentioned on the OMAP-L137 you need to select the right transceiver to support it and to consider PCB trace and cable characteristic.
Regards
Antony
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