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Date: Fri, 08 Jun 2007 00:17:39 +0400
From: Sergei Shtylyov <sshtylyov@ru.mvista.com>
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To: "Leisner, Martin" <Martin.Leisner@xerox.com>
Subject: Re: how are the interrupts mapped on the taiga board?
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Cc: "Lund, Nathan" <Nathan.Lund@xerox.com>, linuxppc-embedded@ozlabs.org
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Leisner, Martin wrote:
> I'm looking at mpc7448hpc2.dts -- and the tsi108 specs...

> I see how TTYS0 is IRQ12 and the ethernet is IRQ16...that agrees with
> the file...
> and the tundra TSi108 spec.

> But in after we boot in /proc/interrupts:
> 
>  16:       1796  Tsi108_PIC Edge      serial
>  18:      24148  Tsi108_PIC Level     eth0

> I don't see in the .dts a mapping from 12->16 and 16->18.
> Nore have I found anything in the source...

> I using 2.6.21.1.

> How is this done?

    It's done by arch/powerpc kernel itself which remaps any IRQs < 16.

WBR, Sergei