Hello all,

I have installed Ubuntu 8.04 server on a pc and I have this problem:

on the pc there is the motherboards serial port and 2 pci cards with 2 serial ports each one, the sum is 5, but ubuntu recognises 4.

this is because in .config of the kernel its set this way:
CONFIG_SERIAL_8250_RUNTIME_UARTS=4


So, all I have to do is change this to:
CONFIG_SERIAL_8250_RUNTIME_UARTS=14

right?

to do it I have to recompile the whole kernel?
I ve tryied to with some guides I ve found but no luck!! only erros and faulty kernels..

any help apriciated

The Ubuntu kernel is heavily patched by the Ubuntu developers. So to recompile the kernel it is probably best to use the current .config as a starting point, and just change that one item you need to change.
Here are some guides to compiling a kernel for Ubuntu:
http://www.howtoforge.com/kernel_compilation_ubuntu
https://help.ubuntu.com/community/Kernel/Compile

I don't know if there is an easier way to accomplish what you want to do without recompiling the kernel.
Here are some suggestions from the Ubuntu forums for getting multiple serial ports to work:
http://ubuntuforums.org/showthread.p...t=serial+ports
http://ubuntuforums.org/showthread.p...t=serial+ports

Oh, and welcome to the LQ forums!