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?
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?