From: Jan Kiszka <jan.kiszka@domain.hid>
To: "s.a." <sancelot@domain.hid>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-core] io apic and shared irq questions
Date: Thu, 01 Jun 2006 11:44:39 +0200 [thread overview]
Message-ID: <447EB707.7090605@domain.hid> (raw)
In-Reply-To: <447ED64F.7090902@domain.hid>
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s.a. wrote:
> Hi,
>
> Regarding an embedded realtime system, I have got a communication board
> on pci bus .
>
> I would like it's interrupt not being shared (with usb) , because the
> component receives an it every 100us and is realtime determinist.
> I looked at how was routed IRQ's with the io apic , although it is able
> to use 24 irq's, linux always share my PCI boards IRQ with another
> component and do not use all the 24 irq's range capability of ioapic.
>
> Do you think it is possible to program the ioapic in order to have a
> better irq mapping and avoid this problem and use all the range of
> availbale vectors ?
Logical IRQ numbers are one side, but you first have to find out if the
PCI components do not share the same *physical* line. Dependent on the
system design, there should be some way to flip those line assignment,
either by moving to another extension slot or even by playing with
jumpers (PC/104plus boards may provide this e.g.).
Jan
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prev parent reply other threads:[~2006-06-01 9:44 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-01 11:58 [Xenomai-core] io apic and shared irq questions s.a.
2006-06-01 9:44 ` Jan Kiszka [this message]
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