Hi, I do a bit of work on HP Itaniums. From my windows computer I can putty into the console of this computer via the serial port on my PC.
I tried this on a linux box - CentOS6.4. The motherboard has 2 serial ports. A grep on dmesg shows:
serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
00:08: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
00:09: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
I am not sure which is which so I plugged the cable into both and I tried to connect via /dev/ttyS0 and ttyS1. This always gives me:
Unable to open connection to:
Unable to open serial port
The sad thing is that I get the same response on ttyS2 & ttyS3. I guess the question is...how do I diagnose activity on the serial ports?