> Based on the user_irq.c I created a simple test program for my PPC405GPr
> board.
> We have a FPGA which generates an interrupt every millisecond.
> It seems to work as simple test (fire it once and assure that it
> sets the interrupt-bit).
> When I connect it to the irq_server however (letting the main task
> sleep 1 second) I get around 2321964 error and not a single OK from
> rt_intr_wait.
> Also my debug LED flicker very fast.
> The FPGA is connected to the External Interrupt 0, which has the number 25.
> I think that I either got the polarity/level/edge register wrong or
> I am playing with the wrong interrupt.
> Could anybody tell me, whether I used the correct interrupt number?

I think you are OK on that point. Just beware that your 405GPr can work in two 
- 7 external interrupts and x GPIO lines 
- 13 external interrupts and x-6 GPIO lines
However, I think the IRQ 25 is the external interrupt 0 in both cases. That 
issue is detailed in the AMCC user manual.

> Does Linux somewhere overwrite the values for the UIC polarity/level, etc
> settings written by U-Boot (e.g. for my board in board_early_init_f)

That may be the case. Have a look at the 
header "linux/include/asm-ppc/ppc4xx_pic.h" (if you are using the old ppc 
branch). If you are using the powerpc branch, check whether the 
function "uic_set_irq_type()" is called.

For example, if you are using the sycamore eval board (and the old ppc 
branch), all the external interrupts are configured in level mode with 
negative polarity (arch/ppc/platforms/4xx/sycamore.c).


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