we need TX1 can receive/send CMD via UARTB at UBOOT, so I try to configure UARTB at board_f.c of UBOOT but not success, it follow the below process,
- assert UARTB reset
- enable UARTB clock
- delay 2us
- de-assert UARTB reset
- configure UARTB reg DLL/DLH for Baudrate, source clock is 408MHZ, baudrate is 115200。
- configure FCR with 1.
- write UARTB THR reg to output data via UARTB
UARTB hasn’t output, and TX signal always is 3.3V.
i have compare register of UARTB and UARTA， all are same,but UARTA can work with the same process.
Is the previous configuration process wrong?