[Asterisk-Users] Re: wctdm and two tdm cards

[Miguel Ruiz Velasco Sobrino]

>> I have a server I'm working on here with two tdm cards in it.
>> 4 FXS and 4FX0. Both cards work fine on their own. The problem
>> lies with using both in the system at once. I have verified the
>> IRQ's are fine. I have tried switching the slots the cards reside in, no 
>> luck though. I am using ACPI but not APM. I am using gentoo latest, with 
>> vanilla 2.6(.10) kernel and udev. CVS as of CVS-HEAD-03/02/05-03:42:41.
>> 
>> The problem is as follows:
>> 
>> If I power up the system from system off, the cards both get detected
>> 
>> If I reboot the system with reset button, ctrl alt del, or 'reboot'
>> the TDM04P does not get detected.
>> 
>> If I then reboot, then hit the power button, and let it turn off, then
>> turn it back on again and boot, it detects both cards fine.
>> 
>> I have tried searchign the list archives, but I have not had much luck. 
>>   One person on IRC mentioned he's seen this before, but didn't have any
>> solutions.
>> 
>> Does anyone here know what might be the problem? or have a fix/work 
>> around? I know I shouldnt be rebooting servers, but I have to make sure 
>> it works upon reboot as it is going to be installed in a power-outtage 
>> happy part of the world :)
>
>I'm not having any problems like that with RHv9 (2.4 kernel), so I'd have
>to guess the issue is 'timing' related in whatever script that loads your
>tdm-zaptel drivers.
>
>As I recall (as a non-v2.6 user), there was an issue with timing and 
>someone added a sleep/wait statement in the startup script to bypass the
>problem. Might consider finding your startup and add some additional time
>to that sleep/wait.
>
>Another approach to isolating the problem is to load the drivers by hand
>paying close attention to error messages, delays, etc. If your not sure
>how to do that, read your startup script and simply do those steps manually.
>
>Someone mentioned unplugging power and/or removing the card. That approach
>is totally BS. The same startup process is run regardless of whether one
>is rebooting or starting from power-on. There is nothing on the tdm card
>that stores values (no flash, no battery backup mem, etc). If the startup
>script operates "one time" from any startup mode, it is setting the tdm
>registers, etc, correctly.
>
>I'm away from the office this week, but I recall there was a readme shipped
>with the zaptel source that discusses kernel 2.6 timing issues. Might look
>for that in your src directory.

The approach of non-rebooting but power off and then power on (cold reboot), is NOT BS.
For me had been the only way to "reboot" the server with the TDM cards. If you make a hot
reboot (al least with my cards) the modprobe will have fatal errors and won't load the
cards. I think it's MoBo related, maybe some kind of IRQ assignment not released.

=====
Miguel Ruiz Velasco

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