[Xenomai] Only 2 serial ports at a time with xeno_16550A driver

Lennart Sorensen lsorense at csclub.uwaterloo.ca
Wed May 23 16:56:57 CEST 2018

On Wed, May 23, 2018 at 11:18:04AM +0200, Jan Kiszka wrote:
> As noted in the other thread, IRQ 5 is most probably wrong. Check what
> Linux uses when you attach the device to a normal Linux driver.

Agreed.  PCs use IRQ 4 and 3 for serial ports at addresses 3f8, 2f8,
3e8 and 2e8.

ttyS0: 0x3f8 irq 4
ttyS1: 0x2f8 irq 3
ttyS2: 0x3e8 irq 4
ttyS3: 0x2f8 irq 3

It can often be changed, but those are the defaults.

Len Sorensen

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