Serious problem with MAKEDEV and setserial command

Serious problem with MAKEDEV and setserial command

[Samuel Jobin]

Hi!

I have a serious problem with the MAKEDEV and setserial command.  I'm 
trying to put a lots of multimodem card into a standard linux pc 
(Slakware 8.1).  I have to associate the modem by myself with the 
setserial command.  For this, I do:

setserial /dev/ttyS20 irq 10 port 0xd000 ^auto_irq ^fourport skip_test 
autoconfig

Everything works fine.  The problem is that there's no enough ttyS.  On 
my linux box, I have ttyS1 to ttyS31, but I want more of them.

I triyed the /dev/MAKEDEV command (and I changed the group for uucp). 
The new dev was created (ttyS32).  I tried to make a setserial it and I got:

Cannot set serial info: Invalid argument

Tried a lot of time, from different method; nothing to do.  I always 
have the same error message.  I think it's my /dev/ttyS32 that doesn't 
work (because the same instruction with a ttyS that wasn't created by me 
works great).

Does somebody could help me please?  I just don't what to do.  (and yes, 
I RTFM! :)  In fact, 2 books and the serial howto...

Thx,

Sam
-- 
Samuel Jobin
   sjobin@gniinc.net
   Software Development
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Re: Serious problem with MAKEDEV and setserial command

[Riley Williams]

Hi Sam.

 > I have a serious problem with the MAKEDEV and setserial command.
 > I'm trying to put a lots of multi-modem card into a standard Linux
 > PC (Slackware 8.1). I have to associate the modem by myself with
 > the setserial command. For this, I do:
 >
 > setserial /dev/ttyS20 irq 10 port 0xd000 ^auto_irq ^fourport \
 >	skip_test autoconfig
 >
 > Everything works fine. The problem is that there's no enough ttyS.
 > On my Linux box, I have ttyS1 to ttyS31, but I want more of them.

It's possible that your MAKEDEV hasn't been taught how to create more
than 32 serial ports. The following commands should in theory create
all the valid ttyS ports, according to the devices.txt in the current
kernels...

    cd /dev
    rm -f ttyS*
    for N in `seq 0 191` ; do mknod ttyS${N} c 4 $[${N}+64] ; done
    chown uucp. ttyS*

...and watch the type of brackets on the third line as they do matter.

 > I tried the /dev/MAKEDEV command (and I changed the group for uucp). 
 > The new dev was created (ttyS32).  I tried to make a setserial 
 > it and I got:

As stated above, it's quite possible that your MAKEDEV doesn't know
how to do this as few systems have that many serial ports.

Best wishes from Riley.
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