Re: [Xenomai-help] IRQ conflict issues with and ESD PMC card.

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

Nape Ibrahim Lentsoane wrote:
> 
> 
> On Wed, Jun 30, 2010 at 11:23 PM, Gilles Chanteperdrix
> <gilles.chanteperdrix@xenomai.org
> <mailto:gilles.chanteperdrix@xenomai.org>> wrote:
> 
>     Nape Ibrahim Lentsoane wrote:
>     > Okay, we updated the BIOS with a custom made version from
>     Advantech. At
>     > least we are able too boot now but
>     > now  my usb mouse/port does not work. By the way I'm running on an
>     > industrial SBC from Advantech model MIC-3390.
>     > The contents of /proc/interrupts and /proc/xenomai/irq are in
>     > "pro_interrupts.txt" and "xenomai_irq_2.txt" respectively
>     > as attached.
>     >
>     > Something strange which I do not understand is that ran the '#
>     lsmod | grep
>     > xeno_can' and look at the results in the
>     > attached file "lsmod_grep_xeno_can.txt". What is puzzling is that I
>     > configured the Xenomai CAN stuff to load as modules
>     > but here they are automatically loaded, how's that?
>     >
>     > I'll try to enable the APIC and local APIC and see what happens.
> 
>     Ok. Now we can see things more clearly. First: the APIC is already
>     enabled in your kernel configuration, and seems not to be used, the ACPI
>     is broken, I do not know if this is the problem, but it seems your APIC
>     is not used. This is bad news. If that is possible, you should try and
>     use a BIOS with ACPI. I mean, come on, this has been the standard for
>     over 10 years now. See:
>     http://en.wikipedia.org/wiki/ACPI
> 
>     Second, your kernel is not really well configured:
>     - you have enabled multi-processor support whereas you have a single
>     CPU, disable it
>     - you probably use the generic IDE driver, whereas you should use the
>     one for the hardware you really have, use lspci to find out what the
>     hardware you use is.
>     - you enabled Xenomai SMI workaround, at this stage, this is a bad idea,
>     you should follow the guidelines in the "TROUBLESHOOTING" guide in order
>     to enable it. But this is too early, please keep it disabled for now.
> 
>     And now, the really bad news: you have the IRQ shared between Xenomai
>     driver and Linux driver issue. IRQ 12 is used both by the Xenomai CAN
>     driver and by the Linux USB controller. This is probably the reason why
>     the USB is not working. See the FAQ for suggestions on how you may solve
>     this issue.
> 
> Okay, I can work without the USB for now but I don't understand
> something here.
> We have have similar other SBCs with Arcnet cards installed and running
> RTNet and
>  some RTAI and they seem work well even if an IRQ is shared between RT
> and non-RT.
> For an example our real time Arcnet driver is sharing an IRQ with the
> SMBus and there no issues there.
> Just out of curiosity, why is this an problem with Xenomai?

It is as much a problem with RTAI as with Xenomai. You probably have no
issues with RTAI because you only use the real-time or non real-time
driver, or you have high IRQ latencies due to the masking until the
non-RT driver handles the interrupt. In other words, you may have issues
but do not see them.

-- 
					    Gilles.