Using interrupts 8-11

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I am trying to enable the use of interrupts 8-11 (for 3D framebuffer support)
but I have run into a brick wall.  Whenever I enable IRQ 8 (the VI trace
one), the system freezes immediately.  My handler routine does nothing, it
just returns IRQ_NONE.  I thought that maybe it would only freeze during
system initialization so I created an ioctl call in the framebuffer which
would delay the creation of the IRQ handler.  The system booted as expected
but then when I executed the ioctl and the handler was registered, it froze
again.  I had Masken run the kernel through his emulator and it seems like
after the interrupts run that the system keeps going into an eternal idle
loop.  As I am no master of the PPC interrupt handling routines, I was
wondering if some other kernel hackers could assist in trying to get IRQ 8
working as expected?
As a side effect, IRQ 11 caused a system hang as well (CP FIFO) when an
overflow interrupt occured.

Todd Jeffreys
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