ttyS* assignments at boot time

oconnorb · 07-08-2003, 06:33 PM

I have RH7.2 on an plain old interl box with 2 standard COM ports (IRQ and address). When the box boots, com1 is assigned ttyS0 and com2 is assigned ttyS3.

Jun 27 20:11:41 localhost kernel: ttyS00 at 0x03f8 (irq = 4) is a 16550A
Jun 27 20:11:41 localhost kernel: ttyS03 at 0x02e8 (irq = 3) is a 16550A

My question is what logic is used here and why is com2 not assigned ttyS1? Why the gap of S1 and S2?
Thanks.

2damncommon · 07-08-2003, 08:56 PM

That is odd if you do not have any add on cards.
Mine:
Jul 8 16:42:17 kernel: ttyS00 at 0x03f8 (irq = 4) is a 16550A
Jul 8 16:42:17 kernel: ttyS01 at 0x02f8 (irq = 3) is a 16550A

That is for 2 com ports on the mainboard.