Hi all,
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.
"Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
ttyS0: autoconf (0x0000, 0xd1010500):���3֢����16550A
serial8250.0: ttyS0 at MMIO 0xffe04500 (irq = 42) is a 16550A
console [ttyS0] enabled, bootconsole disabled
console [ttyS0] enabled, bootconsole disabled
ttyS1: autoconf (0x0000, 0xd1012600): iir=3 Motorola 8xxx DUART type=16550A
serial8250.0: ttyS1 at MMIO 0xffe04600 (irq = 42) is a 16550A
ttyS2: autoconf (0x0000, 0xd1014700): iir=3 Motorola 8xxx DUART type=16550A
serial8250.0: ttyS2 at MMIO 0xffe04700 (irq = 42) is a 16550A
ttyS3: autoconf (0x0000, 0xd1016800): iir=3 Motorola 8xxx DUART type=16550A
serial8250.0: ttyS3 at MMIO 0xffe04800 (irq = 42) is a 16550A
"
Here is the message when I write anything to /det/ttyS2.
"
serial8250: too much work for irq42
"
BTW, the /dev/ttyS0 and /dev/ttyS1 works fine, that means DUART1 is ok, but how can I use the DUART2?
Regards,
Yanjun Luo.
