[gentoo-user] accessing serial console yields input/output error

[gentoo-user] accessing serial console yields input/output error

[Strake]

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The subject says it all, really. The kernel recognizes the serial port and
assigns it /dev/ttys0, as dmesg confirms, but any attempt to access
/dev/ttys0, including those made by minicom, setserial and a little test
program that merely opens the file, fails with an "input/output error". This
annoys me to no end. Help is appreciated.

System specs:
kernel 2.6.18-gentoo-r6
x86_64 (AMD)
MSI K8N Diamond Plus

-- 
Registered Linux User #392061
counter.li.org
--------
If a human doesn't frequently exercise their lips, their brains start
working
- Jasper
--------
Linux wins heavily on points of being available now.
- Linus Torvalds
--------
No, you may not goto the washroom. Last time you went to the washroom, we
found you days later in an air vent.
- Bryn

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Re: [gentoo-user] accessing serial console yields input/output error

[Dan Farrell]

On Tue, 27 Feb 2007 06:05:59 -0500
Strake <strake888@gmail.com> wrote:

> The subject says it all, really. The kernel recognizes the serial
> port and assigns it /dev/ttys0, as dmesg confirms, but any attempt to
> access /dev/ttys0, including those made by minicom, setserial and a
> little test program that merely opens the file, fails with an
> "input/output error". This annoys me to no end. Help is appreciated.
> 
> System specs:
> kernel 2.6.18-gentoo-r6
> x86_64 (AMD)
> MSI K8N Diamond Plus
> 
usually the S in tty names is capitalized in my experience.  I wonder
about IRQs, and about drivers being existant in the kernels.  I wonder
about the attached device - if any.  I also wonder about modules,
whether or not all necessary have been loaded.  

I get the same message catting my serial ports, but to be fair they
aren't plugged in to anything.  
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gentoo-user@gentoo.org mailing list

[gentoo-user] Re: accessing serial console yields input/output error

[Grant Edwards]

On 2007-02-27, Strake <strake888@gmail.com> wrote:

> The subject says it all, really. The kernel recognizes the serial port and
> assigns it /dev/ttys0,

I doubt it.  

Unless you've done some serious kernel hacking, /dev/ttys0 is
the slave end of a pty.

> as dmesg confirms,

I doubt it.

> but any attempt to access /dev/ttys0, including those made by
> minicom, setserial and a little test program that merely opens
> the file, fails with an "input/output error".

That's because the master end of the the pty isn't open.

> This annoys me to no end. Help is appreciated.

Try /dev/ttyS0

-- 
Grant Edwards                   grante             Yow!  I always wanted a
                                  at               NOSE JOB!!
                               visi.com            

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gentoo-user@gentoo.org mailing list

[gentoo-user] Re: accessing serial console yields input/output error

[Strake]

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Actually, that was it. The real serial port is /dev/ttyS0. Thanks for
pointing that out.

On 2/27/07, Strake <strake888@gmail.com> wrote:
>
> The subject says it all, really. The kernel recognizes the serial port and
> assigns it /dev/ttys0, as dmesg confirms, but any attempt to access
> /dev/ttys0, including those made by minicom, setserial and a little test
> program that merely opens the file, fails with an "input/output error". This
> annoys me to no end. Help is appreciated.
>
> System specs:
> kernel 2.6.18-gentoo-r6
> x86_64 (AMD)
> MSI K8N Diamond Plus
>
> --
> Registered Linux User #392061
> counter.li.org
> --------
> If a human doesn't frequently exercise their lips, their brains start
> working
> - Jasper
> --------
> Linux wins heavily on points of being available now.
> - Linus Torvalds
> --------
> No, you may not goto the washroom. Last time you went to the washroom, we
> found you days later in an air vent.
> - Bryn




-- 
Registered Linux User #392061
counter.li.org
--------
If a human doesn't frequently exercise their lips, their brains start
working
- Jasper
--------
No, you may not goto the washroom. Last time you went to the washroom, we
found you days later in an air vent.
- Bryn

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