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P1021 serial driver (printf/printk takes long time to appear on the UART)

Question asked by Kamaraj P on Jul 18, 2017
Latest reply on Sep 18, 2017 by Yiping Wang



After linux comes up in the P1021 board, the printf () message from application does not come immediately.

It takes more time to display on the console(more than 3 min).  Is there any issue with serial driver ?

Here is the DTS info of our serial:


serial0: serial@4500 {
cell-index = <0>;
device_type = "serial";
compatible = "ns16550";
reg = <0x4500 0x100>;
clock-frequency = <0>;
current-speed = <9600>;
interrupts = <42 2>;
interrupt-parent = <&mpic>;