I have a new board of P1010 and we want to use the four uarts. I set the pin mux at u-boot, add the two serial ports in dts file, then I can see the /dev/ttyS2 and /dev/ttyS3 devices. But when I try to send out something, the kernel will crash, I found it can't exit the interrupt routine, and I can't see any thing out from the pin with scope. It looks like the DUART2 has something wrong, I don't know how can I enable it. Does anybody use it before?
Here is the serial port message at boot up. We can see the 4 serial ports is there.