[asterisk-dev] TDM400P, Avoiding FXO modules installed in Slot 1.

[Alec Davis]

18 month's ago I learn't on Asterisk BootCamp that with the TDM400P and FXO
modules to avoid Slot1.
Why? It wasn't satisfactorily answered for me.
 
The wctdm.c code also reflects that with the following statement in
'wctdm_voicedaa_check_hook'
    /* Try to track issues that plague slot one FXO's */
    ....
 
In an effort to understand the problem, I need information under what
circumstances and senarios that the problems happened, and the symptoms.
Does anyone remember details?
Are the problems documented anywhere?
 
I opened a bug yesterday https://issues.asterisk.org/view.php?id=15261 ,
which corrects the SPI timing to the Si3210/15 Proslic, but does it fix the
Slot 1 FXO problem?. I can't get mine to fail, old code or patched.
 
<speculation>
Are there documented reasons as to why the original wcfxs.c code was changed
(refer bug report above)? As the original wcfxs.c 'read_8bits' code was
right, then it got changed to incorrect SPI read timing, then later the
TDM400P (wctdm.c) came out and was based on the bad code.
 
This may be speculation at this stage that the problem with an FXO module in
slot 1, and the incorrect SPI timing in read_8bits is related.
</speculation>
 
Alec Davis
 
 
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