Hi.
> I have one PC with the two standard serial ports ttyS0 and ttyS1 plus an
> STB Fourport card.
>
> When I run OS/2 in this PC I had setup one of the STB ports on IRQ 11
> and the remaining three in IRQ 12, all with different I/O addresses of
> course.
>
> I'm currently trying to configure my serial ports and it was my
> intention to run setserial from rc.local for ttyS2, ttyS3, ttyS4 and
> ttyS5.
>
> ttyS2 and ttyS3 works fine. But when running setserial for ttyS4 or
> ttyS5 if fails with the message that /dev/ttyS4 (or 5) doesn't exist,
> which is also the case.
>
> What can I do to 'create' my /dev/ttyS4 and /dev/ttyS5 ?
What you need is to use 'mknod' with the appropriate options.
In /usr/src/linux/Documentation/devices.txt we see that ttys are of
major 4 and that the ttyS' are from minor 64 and up. We also see it's a
character device. (That's what we specify to mknod).
ttyS0, 1, 2, 3 are minor 64, 65, 66, 67 so ttyS4 and S5 are 68 and 69.
Run this:
mknod /dev/ttyS4 c 4 68
mknod /dev/ttyS5 c 4 69
The 'c' is 'character device', the '4' is Major, the '68/69' is minor'.
Then we see that the other ttyS are owner root, group tty and have
access flags : crw------- .
Change owner and permission of files:
chown root.tty /dev/ttyS[45]
chmod 600 /dev/ttyS[45]
Yes, write like that with the brackets. Saves you some writing :)
Now an 'ls -l /dev/ttyS*' should show you that you suddenly have the
required ttyS'.
Good luck!
// Stefan
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