Hi! This is another question from a newbie.
HPS in DE0-nano-SoC has 2 UARTs. First of them (UART0) is used for console (ttyS0) via USB.
I want to use second UART (UART1) for data transfer from Linux (Debian wheezy armhf).
I used Linux 4.3
My first test was to open /dev/ttyS0 via ssh. (stty -F /dev/ttyS0)
Device was successfully opened and keystrokes successfully transmitted to the serial terminal
But I was unable to open /dev/ttyS1 (stty -F /dev/ttyS1) with error
stty: /dev/ttyS1: input/output error
In /proc/tty/driver/serial I have:
serinfo:1.0 driver revision: 0: uart:16550A mmio:0xFFC02000 irq:35 tx:10401 rx:724 RTS|DTR 1: uart:unknown mmio:0xFFC03000 irq:36
Output of Linux starting:
Serial: 8250/16550 driver, 2 ports, IRQ sharing disabled [0.204597] ffc02000.serial0: ttyS0 at MMIO 0xffc02000 (irq = 35, base_baud = 6250000) is a 16550A
but no information about ttyS1.
Its seems that ttyS1 is not connected to UART1.
Same problem is in system image from official terasic site
But in Linux image from rocketboards /dev/ttyS1 works well!
How can I activate /dev/ttyS1?
Thanks. Sorry for my english