Multiple serial consoles via null modem cable

Marin Atanasov dnaeon at gmail.com
Fri Jan 22 06:36:53 UTC 2010


On Thu, Jan 21, 2010 at 6:26 PM, Ulrich Spörlein <uqs at spoerlein.net> wrote:

> On Thu, 21.01.2010 at 11:37:06 +0200, Marin Atanasov wrote:
> > Here's what I did:
> >
> > box1 COM1/ttyd0 -> box2 COM1/ttyd0 -> using null modem cable
> > box1 COM2/ttyd1 -> box3 COM1/ttyd0 -> using null modem cable
> >
> > On box1 I have this in /etc/ttys:
> >
> > ttyd0   "/usr/libexec/getty std.9600"   vt100   on secure
> > ttyd1   "/usr/libexec/getty std.9600"   vt100   on secure
> >
> > Now if I want to connect to box1 from box2 or box3 through the serial
> > connection it should work, right?
> > But I only can connect to box1 from box2, because box2's COM port is
> > connected to box1's COM1 port.
>
> Are there actually two gettys running on the serial ports? Did you do
> kill -1 1 after the changes to /etc/ttys?
>
> On box1, what do the following commands produce
>
> egrep "uart|sio" /var/run/dmesg.boot
> pgrep -fl getty
>
> Regards,
> Uli
>
Hi,

This is the output from the requested commands:

box1# egrep 'uart|sio' /var/run/dmesg.boot
usb0: USB revision 1.0
sio0: <16550A-compatible COM port> port 0x3f8-0x3ff irq 4 flags 0x10 on
acpi0
sio0: type 16550A
sio1: <16550A-compatible COM port> port 0x2f8-0x2ff irq 3 on acpi0
sio1: type 16550A

box1# pgrep -fl getty
3066 /usr/libexec/getty std.9600 ttyd1
3065 /usr/libexec/getty std.9600 ttyd0
534 /usr/libexec/getty Pc ttyv7
533 /usr/libexec/getty Pc ttyv6
532 /usr/libexec/getty Pc ttyv5
531 /usr/libexec/getty Pc ttyv4
530 /usr/libexec/getty Pc ttyv3
529 /usr/libexec/getty Pc ttyv2
528 /usr/libexec/getty Pc ttyv1
527 /usr/libexec/getty Pc ttyv0

Regards,
Marin
-- 
Marin Atanasov Nikolov
dnaeon AT gmail DOT com
daemon AT unix-heaven DOT org


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