kern/147082: [uart] Serial ports unusable

[Mayo Jordanov]

On 2010-05-26, at 19:34 , Garrett Cooper wrote:

> On Wed, May 26, 2010 at 6:42 PM, Mayo Jordanov <mayo at oyam.ca> wrote:
>> 
>> On 2010-05-26, at 12:42 , remko at FreeBSD.org wrote:
>> 
>>> Synopsis: [uart] Serial ports unusable
>>> 
>>> State-Changed-From-To: open->feedback
>>> State-Changed-By: remko
>>> State-Changed-When: Wed May 26 19:42:36 UTC 2010
>>> State-Changed-Why:
>>> I send my working serial line to Mayo, set status to feedback
>>> 
>>> http://www.freebsd.org/cgi/query-pr.cgi?pr=147082
>> 
>> I'm gona re-reply here, to preserve the history.
>> 
>>>>> How-To-Repeat:
>>>> 1) Edit /etc/ttys, do the ttyu0 line reads:
>>>> ttyu0        "/usr/libexec/getty std.9600"   vt100   on secure
>>>> 2) kill -HUP 1
>>>> 3) Try connecting to it with terminal application
>>> 
>>> 
>>> /etc/ttys
>>> console    "/usr/libexec/getty Pc"         cons25  on  secure
>>> 
>>> /boot/loader.conf
>>> console="comconsole"
>>> 
>>> That enabled serial access to my Soekris device running on FreeBSD8(PFsense), it also works for several remote machines I have.
>>> 
>>> Can you confirm that you have these settings in loader.conf and rebooted?!
>>> 
>>> --
>>> /"\   Best regards,                        | remko at FreeBSD.org
>>> \ /   Remko Lodder                      | remko at EFnet
>>> X    http://www.evilcoder.org/    |
>>> / \   ASCII Ribbon Campaign    | Against HTML Mail and News
>> 
>> test# cat /boot/loader.conf
>> console="comconsole"
>> 
>> looking at the /etc/ttys entry you pasted above, will that enable serial console? That looks like a regular console on the machine itself.
>> 
>> I have rebooted numerous times, and I do get the kernel messages during boot on serial up to the point where getty starts (presumably... I see portion of the messages as nics are getting setup and then nothing).
>> 
>> I have some machines where serial works fine, but I have some machines where it doesn't and behaves the same way as described above. If necessary, I can provide access to a troublesome machine.
> 
>    All of this is described in more grusome detail at
> http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/serialconsole-setup.html
> .
> HTH,
> -Garrett

Unfortunately, the handbook does not help in this case. If there is a solution to the problem I describe in the PR description in the handbook, please be so kind and point it out to me, because I must be blind.

Also, why do the gettys get stuck and I have to kill them manually (or reboot because they can't be killed) to reflect changes to /etc/ttys instead of simple `kill -HUP 1`? I've never ever had to do it manually in previous FreeBSD installations/versions. Why are they stuck in ttydtd and not in ttyin as they are supposed to be?

Thanks,
mayo