NetMos 6-Port Serial Console in Fedora 10
I recently bought a NetMos 6 ports serial console card. It is installed in my Fedora 10 computer. As you might guess, the Linux only recognize the first four serial device, which is ttyS[0-3]. The problem in here is, the Fedora has already recognized the serial console card driver, but it only keep the first four as default. How to expand those ports?
There are many solutions. After some study, I found the simple way to solve this problem. Edit /boot/grub/menu.lst, add one more option “8250.nr_uarts=8″ after kernel command.
kernel /vmlinuz-2.6.27.41-170.2.117.fc10.i686 ro root=/dev/VolGroup00/LogVol00 rhgb quiet 8250.nr_uarts=8
After reboot the system, we can verify if all the ports are supported.
[root@console ~]# ls -la /dev/ttyS[0-8]
crw-rw—- 1 root uucp 4, 64 2010-01-21 11:29 /dev/ttyS0
crw-rw—- 1 root uucp 4, 65 2010-01-21 11:29 /dev/ttyS1
crw-rw—- 1 root uucp 4, 66 2010-01-21 11:29 /dev/ttyS2
crw-rw—- 1 root uucp 4, 67 2010-01-21 11:29 /dev/ttyS3
crw-rw—- 1 root uucp 4, 68 2010-01-21 11:29 /dev/ttyS4
crw-rw—- 1 root uucp 4, 69 2010-01-21 11:29 /dev/ttyS5
crw-rw—- 1 root uucp 4, 70 2010-01-21 12:15 /dev/ttyS6
crw-rw—- 1 root uucp 4, 71 2010-01-21 11:29 /dev/ttyS7
crw-rw—- 1 root uucp 4, 72 2010-01-21 11:29 /dev/ttyS8
We can list PCI to see hardware information.
00:08.0 Serial controller: NetMos Technology PCI 9845 Multi-I/O Controller (rev 01) (prog-if 02 [16550])
Subsystem: LSI Logic / Symbios Logic 0P6S (6 port 16550a serial card)
Flags: medium devsel, IRQ 16
I/O ports at 8400 [size=8]
I/O ports at 8000 [size=8]
I/O ports at 7800 [size=8]
I/O ports at 7400 [size=8]
I/O ports at 7000 [size=8]
I/O ports at 6800 [size=16]
Kernel driver in use: serial
Kernel modules: parport_serial
We also can see serial port information. From that we can see that ttyS[1-3] is unknown port. The port ttyS[4-9] is actually my 6 serial ports.
[root@console ~]# setserial -g -G /dev/ttyS[0-9]
/dev/ttyS0 uart 16550A port 0x03f8 irq 4 baud_base 115200 spd_normal skip_test
/dev/ttyS1 uart unknown port 0x02f8 irq 3 baud_base 115200 spd_normal skip_test auto_irq
/dev/ttyS2 uart unknown port 0x03e8 irq 4 baud_base 115200 spd_normal skip_test auto_irq
/dev/ttyS3 uart unknown port 0x02e8 irq 3 baud_base 115200 spd_normal auto_irq
/dev/ttyS4 uart 16550A port 0×8400 irq 16 baud_base 115200 spd_normal skip_test
/dev/ttyS5 uart 16550A port 0×8000 irq 16 baud_base 115200 spd_normal skip_test
/dev/ttyS6 uart 16550A port 0×7800 irq 16 baud_base 115200 spd_normal skip_test
/dev/ttyS7 uart 16550A port 0×7400 irq 16 baud_base 115200 spd_normal skip_test
/dev/ttyS8 uart 16550A port 0×7000 irq 16 baud_base 115200 spd_normal skip_test
/dev/ttyS9 uart 16550A port 0×6800 irq 16 baud_base 115200 spd_normal skip_test
Finally, I am able to use minicom to access my devices.
Thanks
