Matthias Fuchs wrote:
On Monday 11 September 2006 20:13, Wolfgang Grandegger wrote:
In 2.6 the interrupts are disabled by default. Then the attached patch
for Xenomai should help.
Wolfgang.
Your patch also works fine. Now what's the recommended solution? I noticed
that Philippe already checked in an Adeos fix.
As mentioned, in Linux 2.6 (generic IRQ layer), IRQs are disabled by
default in kernel/irq/handle.c:
irq_desc_t irq_desc[NR_IRQS] __cacheline_aligned = {
[0 ... NR_IRQS-1] = {
.status = IRQ_DISABLED,
.handler = &no_irq_type,
.lock = SPIN_LOCK_UNLOCKED
}
};
Till now, I haven't found IPIPE/Xenomai related code removing the
IRQ_DISABLED bit. But I wonder why it's working for x86. Maybe I have
missed something.
In Linux 2.4, the "status" field is initialized to 0 (in
arch/ppc/kernel/irq.c) not making trouble:
irq_desc_t irq_desc[NR_IRQS] __cacheline_aligned =
{ [0 ... NR_IRQS-1] = { 0, NULL, NULL, 0, SPIN_LOCK_UNLOCKED}};
At least my CAN PCI card on a MPC5200 works fine.
Philippe, do we really need these ugly PIC patches?
Wolfgang.
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