Ok, Thanks Vchong.
Actually i worked with UART1 , initially i was able to make communication between PC and board with voltage level shifter IC,
reading ttyHSL0 works then sending text file via ttyHSL0 also works independently. Later on-wards the board receiver stops working , and if i connect tx rx lines it started sending junk data. when ever i restart it
shown the error message “gbam_connect_work: Bam channel is not ready”
If this UART could works, i can use diffrent MCu for processing my Sensors.