Hello.
Charles Krinke wrote:
> Let me try a more simplified IRQ question a different way by only
> referring to the 8541.
> There are 12 external interrupt sources, irq[0..11] and as I understand
> it, they all go through one vector, ExternalInput set in
> head_fsl_booke.S and this vector resolves to "do_IRQ()", which I believe
> is in arch/powerpc/kernel/irq.c (not arch/ppc/kernel/...).
> I am striving to understand how mapping of these external pins
> irq[0..11] gets to IRQ numbers as shown with "cat /proc/interrupts".
IIUC, the external IRQ #'s should follow those occupied by 32 internal IRQs.
But those shown in that file are "virtual" numbers, i.e. they got re-mapped
by the kernel as it sees fit (basically, it tries to assign the same # to IRQs
above 15 and remaps those below)
> Could someone point me at some references I can read to understand this
> nuance of the 8541 in a linux-2.6.17.11 kernel, please.
I'm not sure arch/powerpc/ in 2.6.17 had the complete MPC8541 support...
WBR, Sergei
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