From mboxrd@z Thu Jan  1 00:00:00 1970
From: Philippe Gerum <rpm@xenomai.org>
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Date: Thu, 03 Mar 2011 08:32:28 +0100
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Subject: Re: [Xenomai-help] Stuck MSI in normal Linux driver
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To: Richard Cochran <richardcochran@domain.hid>
Cc: Jan Kiszka <jan.kiszka@domain.hid>, xenomai@xenomai.org

On Thu, 2011-03-03 at 08:21 +0100, Richard Cochran wrote:
> On Wed, Mar 02, 2011 at 07:18:46PM +0100, Jan Kiszka wrote:
> > On 2011-03-02 16:26, Gilles Chanteperdrix wrote:
> > > Richard Cochran wrote:
> > >> The wiki pages 
> > >>
> > >>    http://www.xenomai.org/index.php/FAQs
> > >>    http://www.xenomai.org/index.php/Configuring_x86_kernels
> > >>
> > >> say not to enable MSI on x86, with a link to a very old (2008)
> > >> discussion.
> 
> ...
> 
> > The current situation looks like this:
> >  - MSI[-X] usage for plain Linux drivers is fine, we are using it on
> >    machines where you can hardly avoid MSI today
> >  - MSI[-X] usage for RTDM (ie. RT) drivers is basically fine as long as
> >    you avoid enabling/disabling from RT context (also used for quite
> >    a while here, no known issues under this restriction)
> 
> Okay, so I understand from this:
> 
> 1. The wiki warning is out of date.
> 
> 2. My own PCIe MSI driver/card *should* work.
>    (It is not a current known limitation of adeos/xenomai.)

The situation is not that clear. Enabling CONFIG_PCI_MSI on some 83xx
board did cause a lock up at boot for me, so this may point the finger
at the pipeline core for ppc, and not to Xenomai which was barely active
at that stage.

> 
> Thanks,
> 
> Richard
> 
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-- 
Philippe.