On Fri, 2007-04-27 at 12:03, Sergei Shtylyov wrote: > 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)
And remember, Ben distorted the IRQ World right about somewhere in that time frame too. Kumar, can you remind us? > > 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... Which might be a different way of saying "You should try the current top of git or 2.6.21." :-) jdl _______________________________________________ Linuxppc-embedded mailing list [email protected] https://ozlabs.org/mailman/listinfo/linuxppc-embedded
