From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Tue, 17 Jun 2008 09:30:51 +0200
From: Philippe Gerum <rpm@xenomai.org>
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Subject: Re: [Xenomai-core] Compile-time bug,
	and problem with PPC440 ethernet
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To: "Steven A. Falco" <sfalco@domain.hid>
Cc: xenomai@xenomai.org

Steven A. Falco wrote:
> I am building kernel 2.6.25.4 from DENX with Xenomai 2.4.4 for PPC440EPx
> (sequoia development board).
> 
> The kernel tries to use DHCP to obtain network settings.  With IPIPE
> disabled, this works perfectly.  However, when I enable IPIPE, the board
> sends packets ok, but does not receive packets - I can see the DHCP with
> a sniffer, but the development board does not receive them.
>

External interrupts are probably locked out by the pipeline engine; I've fixed a
similar issue in recent patches for other PICs. Which I-pipe patch release are
you using?

> Also, in order to disable IPIPE, I had to patch
> kernel/time/tick-common.c around line 168.  It is missing an ifdef:
> 
> diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
> index 58bfacf..3a735b8 100644
> --- a/kernel/time/tick-common.c
> +++ b/kernel/time/tick-common.c
> @@ -163,9 +163,11 @@ static void tick_setup_device(struct tick_device *td,
> 
>         td->evtdev = newdev;
> 
> +#ifdef CONFIG_IPIPE
>         /* I-pipe: derive global tick IRQ from CPU 0 */
>         if (cpu == 0)
>                 ipipe_update_tick_evtdev(newdev);
> +#endif
> 
>         /*
>          * When the device is not per cpu, pin the interrupt to the
> 
> Signed-off-by: Steve Falco <sfalco@domain.hid>
> 
> If anyone has suggestions as to why IPIPE is blocking received ethernet
> packets, I'd appreciate it.
> 
>     Steve
> 
> 
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> 


-- 
Philippe.