[Asterisk-Users] Intel 537EP chipset, revisited

Chris Glover chris at glovercc.clara.co.uk
Fri Jun 11 16:15:50 MST 2004


Just a thought, are you using the XT-PIC mode of IRQ address (old style)
on the new IO-APIC version that Kernel 2.6.x supports?

I found with my Intel 537 modem that it would hang a machine using XT-PIC
(admittedly it was IRQ sharing with all the other crap in the machine) but
using IO-APIC things work better.

IO-APIC should be supported on modern P4 boards, not sure about other
processors. My Duron 700 supoorts IO-APIC but the board doesn't.

It's one of the kernel build options.



E Mail:	chris at glovercc.clara.co.uk
SIP: 84411389 at voiptalk.org
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On Fri, 11 Jun 2004, Lee Howard wrote:

> On 2004.06.11 11:41 Steven Critchfield wrote:
> > You next step really would to be to go looking through the module load
> > function and maybe through some debugging code in there to have it
> > tell
> > you more about what is going on. Luckily enough, if you didn't crash
> > the
> > machine with your module, you can probably load and unload safely
> > until
> > you break something in the module. This is one of those nice things
> > about linux drivers from a developer stand point.
> It turns out that the Linux serial driver had claimed the modem device,
> and thus the wcfxo module was unable to use it.  Once I disabled the
> Linux serial driver (for testing, not a permanent solution, of course)
> then the wcfxo module was able to "pick it up".  The module load still
> failed, however:
> Zapata Telephony Interface Registered on major 196
> Setting hook state to 0 (08)
> Registered Span 1 ('WCFXO/0') with 1 channels
> Span ('WCFXO/0') is new master
> wcfxo: Out of space to write register 06 with e0
> wcfxo: Out of space to write register 0f with 00
> Failed to initailize DAA, giving up...
> Unregistering Span 'WCFXO/0' with 1 channels
> Zapata Telephony Interface Unloaded
> Digging through more archives I see that someone else has gotten this
> far, also:
> http://lists.digium.com/pipermail/asterisk-users/2004-February/035818.html
> Following the comments on:
> http://www.digium.com/index.php?menu=faq#Errors_1
> ... this person assumed that the failure was due to the IRQ being
> shared between devices.  However, in my case the device had its own
> IRQ.  Reading through more archives, I see that the general reason for
> those "Out of space to write register" errors is due to interrupt
> problems, and the general advise has been to change PCI slots.  So I
> tried this.  Depending on the presense of other PCI devices in the
> system as well as their configuration in the PCI slots, I would either
> get the outcome described above, or worse, I would get:
> Zapata Telephony Interface Registered on major 196
> Setting hook state to 0 (08)
> Registered Span 1 ('WCFXO/0') with 1 channels
> Span ('WCFXO/0') is new master
> Unexpected IRQ trap at vector c8
> Unexpected IRQ trap at vector ad
> ... and then the system locks so that it requires a power-cycle/reset.
> IRQs were never shared in any configuration.
> So, at this point I have satisfied my curiosity, and I'm going to
> conclude that the wcfxo driver incompatibility with the Intel 537EP
> chipset is not merely a problem with PCI device IDs, but also that
> there is some deeper incompatibility.  If anyone is interested in
> taking this farther, or if my conclusions are incorrect, just let me
> know, I'll be happy to entertain the experience.
> Thanks.
> Lee.
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