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Missing serial port

 
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# 1  
Old 05-09-2010
Missing serial port
A neighbour's Ubuntu 10.04 machine has five serial ports, one on the motherboard and four on a PCI card. However, only four cards are showing:
Code:
# dmesg | grep tty
[    0.000000] console [tty0] enabled
[    0.394565] serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
[    0.394877] 00:08: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
[    0.395080] 0000:03:06.0: ttyS1 at I/O 0xcf00 (irq = 20) is a 16550A
[    0.395201] 0000:03:06.0: ttyS2 at I/O 0xce00 (irq = 20) is a 16550A
[    0.395320] 0000:03:06.0: ttyS3 at I/O 0xcd00 (irq = 20) is a 16550A
[    8.751992] setserial sets custom speed on ttyS1. This is deprecated.
[    8.754670] setserial sets custom speed on ttyS3. This is deprecated.
[   70.056749] redhot sets custom speed on ttyS3. This is deprecated.
[   80.734705] radoga sets custom speed on ttyS1. This is deprecated.
[ 5437.884113] redhot sets custom speed on ttyS3. This is deprecated.
[ 5510.465311] redhot sets custom speed on ttyS3. This is deprecated.
[ 5662.096348] redhot sets custom speed on ttyS3. This is deprecated.
[ 5692.931148] redhot sets custom speed on ttyS3. This is deprecated.
#

The motherboard card is ttys0. All five ports work in Windows, and replacing the PCI card with another identical, known good card showed the same results. Any ideas what could be wrong?

Thanks.
# 2  
Old 05-10-2010
Do the other three detected ports even work? It may be automatically adding the four "standard" PC serial ports with their hardwired addresses and ISA interrupts, which would only find the ports on the motherboard... Your card might not have been detected at all. You may need to configure your kernel to have the correct module for it.

What does it show in lspci as?
This User Gave Thanks to Corona688 For This Post:
dotancohen
# 3  
Old 05-17-2010
Thanks, Corona. It turns out that the problem was that the Kernel needed to have the remainder of the ports activated:
Linux Online - Serial HOWTO: Serial Tips And Miscellany
 
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