[CentOS] Question on detect serial ports

Tue Jun 11 13:35:35 UTC 2013
Jerry Geis <geisj at pagestation.com>

I have a small based atom machine.
There are four serial ports on the machine.
dmesg | grep tty shows 0, 1, 2 and 3.
2 and 3 are on interrupt 10 -and they worked.

going into the BIOS COM ports 0 and 1 are also on IRQ 10
and not the standard 3,4. BIOS cannot set anything but IRQ 10, 11 for 
serial ports. Odd...

So COM 0 and 1 dont work right away...
I had to put this in the boot script.

setserial /dev/ttyS1 irq 10 port 0x2e8
setserial /dev/ttyS0 irq 10 port 0x3e8

now they seem to work.

I have no idea why the bios will not have IRQ 3 and 4 for com ports
but I was surprised linux did not inquire from the bios and use it.

Should it get that from the BIOS - or - just leave the manual setting 
and move on...