Re: [Xenomai-help] Kernel hangs in initramfs with ipipe activated (arch=ppc)

[Wolfgang Grandegger <wg@domain.hid>]

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fabien wrote:
> 2007/12/20, Wolfgang Grandegger <wg@domain.hid>:
>> Hello,
>>
>> fabien wrote:
>>> hello,
>>>
>>> I'm new to this list and Xenomai. I've ported a Linux 2.6 kernel on a
>>> custom board based on MPC855T (PQ1). I'm able to boot my kernel
>>> 2.6.23-6 (DENX) compiled with eldk 4.1 (uClibC) and run userspace
>>> applications on flash filesystem without problems (Busybox). The
>>> booloader is ppcboot 1.1.5. My uart is on SMC1.
>> The old arch/ppc tree is deprecated and the removal is scheduled for
>> middle of the next year. Any chance to move to "arch/powerpc"?
> 
> I know the arch is deprecated, but i began to work with this arch and
> now i've no more time to move to powerpc arch. Futhermore my
> bootloader is old (ppcboot 1.1.5) and there is no OF support in it :(.
> I just want to do some latency tests with the psos api of Xenomai.
> 
>>> The prepare kernel script patchs correcly the kernel with
>>> adeos-ipipe-2.6.23-ppc-1.6-00.patch. I'm based on arch=ppc :
>>> scripts/prepare-kernel.sh
>>> --linux=/opt/eldk/ppc_8xx/usr/src/linux-2.6-denx/
>>> --adeos=ksrc/arch/powerpc/patches/adeos-ipipe-2.6.23-ppc-1.6-00.patch
>>> --arch=ppc
>>>
>>> When i try to boot with Xenomai support my kernel hangs.
>> Support for MPC8xx boards in Linux 2.6 is still poor and rather
>> experimental and you are likely the first one trying Xenomai with it. We
>> still do not have a MPC8xx platform for testing under 2.6.
> 
> Oh, so I think it won't be easy ... I'm not really an expert with
> realtime, virtualisation ... and
> my internship will finished in one month ... Aie
> So I wish get a little bit support here

Does the attached patch help?

Wolfgang.

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+ diff -u linux-2.6-denx/arch/ppc/8xx_io/commproc.c.IPIPE linux-2.6-denx/arch/ppc/8xx_io/commproc.c
--- linux-2.6-denx/arch/ppc/8xx_io/commproc.c.IPIPE	2007-12-10 19:31:24.000000000 +0100
+++ linux-2.6-denx/arch/ppc/8xx_io/commproc.c	2007-12-20 21:38:29.000000000 +0100
@@ -119,6 +119,11 @@
 	.disable	= cpm_mask_irq,
 	.ack		= cpm_ack,
 	.end		= cpm_eoi,
+#ifdef CONFIG_IPIPE
+	.mask_ack	= cpm_ack,
+	.mask		= cpm_mask_irq,
+	.unmask		= cpm_unmask_irq,
+#endif
 };
 
 void
@@ -201,8 +206,13 @@
         /* install the CPM interrupt controller routines for the CPM
          * interrupt vectors
          */
-        for ( i = CPM_IRQ_OFFSET ; i < CPM_IRQ_OFFSET + NR_CPM_INTS ; i++ )
+        for ( i = CPM_IRQ_OFFSET ; i < CPM_IRQ_OFFSET + NR_CPM_INTS ; i++ ) {
                 irq_desc[i].chip = &cpm_pic;
+#ifdef CONFIG_IPIPE
+		irq_desc[i].ipipe_ack = &__ipipe_ack_level_irq;
+		irq_desc[i].ipipe_end = &__ipipe_end_level_irq;
+#endif
+	}
 
 	/* Set our interrupt handler with the core CPU.	*/
 	if (setup_irq(CPM_INTERRUPT, &cpm_interrupt_irqaction))