How many serial ports will work on Ubuntu?

[Jonathan Ben Avraham]

kernel param: 8250.nr_uarts=5

   - yba


On Sun, 9 May 2010, Dotan Cohen wrote:

> Date: Sun, 9 May 2010 19:35:48 +0300
> From: Dotan Cohen <dotancohen at gmail.com>
> To: linux-il. <linux-il at cs.huji.ac.il>
> Subject: How many serial ports will work on Ubuntu?
> 
> A neighbour's computer has five serial ports, one on the motherboard
> and four on a PCI card. However, only four cards are showing:
>
> # 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. This is Ubuntu 10.04. Is Ubuntu limited to only four
> serial ports? Thanks.
>
> --
> Dotan Cohen
>
> http://bido.com
> http://what-is-what.com
>
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>

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