maximilian attems wrote:
On Tue, Jan 08, 2008 at 02:50:41PM -0600, Lukasz Szybalski wrote:
Currently we have 1 serial port on motherboard and 2 port pci card. I
would like to add another 4 port pci card. I am not able to do it
because I get a conflict on ttyS.
Since regular pc pci limit is on average 3. the max serial ports I could
install is 3x(6port serial card) + 1 on mother board. So Max I could
fit on is 19 if I wanted to. Realistically it would be optimal for me to
have at least 7 available.
Is there some kind of setting that can be changed without recompiling
the kernel to allow this many serial ports or some kernel header that
would increase the number of available serial ports without much problem?
$ egrep NR_UARTS /boot/config-2.6.24-rc7-amd64
CONFIG_SERIAL_8250_NR_UARTS=16
$ egrep RUNTIME_UARTS /boot/config-2.6.24-rc7-amd64
CONFIG_SERIAL_8250_RUNTIME_UARTS=4
This can be overridden with the module parameter "nr_uarts", or
boot-time parameter 8250.nr_uarts.
up to 16 evidently
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
I edited /boot/grub/menu.lst and change the following lines by adding
the 8250.nr_uarts=16 at the end of kernel option.
title Debian GNU/Linux,
kernel 2.6.18-5-686 root (hd0,1)
kernel /boot/vmlinuz-2.6.18-5-686 root=/dev/sda2 ro 8250.nr_uarts=16
initrd /boot/initrd.img-2.6.18-5-686
savedefault
Now I've got:
Serial: 8250/16550 driver $Revision: 1.90 $ 16 ports, IRQ sharing enabled
Just for the my info. Is there a setting I could pass on boot time to
increase the max number of serial ports and then set my 8250.nr_uarts=16
to let say 20.
Thanks,
Lucas
ps. I added the info on the process of going from 4 to 16 here:
http://lucasmanual.com/mywiki/FaxServer#head-e5a4f60720205d4c950a7ba608cd73a35c978946
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