1 Reply Latest reply on Feb 8, 2010 4:01 PM by risa2000

    DH55HC - serial port problem (via header)


      I put together machine with DH55HC (Core i3-530) and run gentoo x86_64 on it. I have problem getting the serial port work, using standard serial port bracket. So far I:


      • checked wiring on bracket and DB9 and intel doc (matched)
      • checked in BIOS serial port is enabled (enabled)
      • connected two different devices (GPS and APC UPS) - (failed)
      • connected same device vie USB->serial adapter (using pl2303 driver) - (both work fine)


      Linux kernel detects at boot two serial ports:

      kernel: 00:09: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A

      kernel: 0000:00:16.3: ttyS1 at I/O 0xf0a0 (irq = 17) is a 16550A


      I expected the first one is the one on the board, but tried both (and wonder from where comes the second one). I am willing to investigate further, but currently do not have any idea where to go. Can anyone help me?

        • 1. Re: DH55HC - serial port problem (via header)

          Sometimes, man has to do, what man has to do ...

          After detaching the adapter cable and rechecking the wiring and crosschecking the connections I figured out that I have originally attached the IDC10 connector wrongly (or not at all) . After reattaching, everything works as supposed.

          The only remaining mystery is, where from comes the second serial detected by linux?