Muller, Ralf (NSN - FI/Espoo) wrote:
I'm using a 8247 custom board and kernl 2.6.21.7
I strongly recommend using something newer. There was a lot of 82xx
work going on around that time.
on the arch/powerpc
branch. Here the irq are virtualized in the irq map functions now I'm
facing several problems.
* I have to manually call irq_create_of_mapping for each CPM interrupt
What's wrong with irq_of_parse_and_map()?
And the major problem is:
Now the kernel mixes virtual- and HW-IRQs, e.g. request_irq works with
HW_IRQs but the interrupt handler with virtual interrupts, which can't work.
No, request_irq works with virtual interrupts as well.
For some reason even on a powerpc the first 16 interrupts are reserved
for legacy (PC) IRQs,
Right, there are powerpc systems with the same legacy interrupts and the
same ISA drivers that expect to be able to use ISA IRQs directly as virqs.
so the easiest mapping HW-IRQ0 -> VIRQ16 a.s.o
The "easiest mapping" is whatever the IRQ subsystem gives you. This
isn't something that should be hardcoded.
-Scott
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