Excuse me, I meant IRQ7 aka IRQ40!!
--- In "Clark" <> wrote:
>
> We have 2.6.29-ts, and notice that the IRQ counts in /proc/interrupt go
> absolutely wild when we attempt to insert a 0.2 second, TTL/CMOS level signal
> onto pin A21 of the PC104 connector of the TS-7260.
>
> When the square wave voltage goes high, the system load goes up so much that
> the shell freezes until the voltage drops, at which time the count in
> /proc/interrupts has jumped like it does each time the voltage goes to 5, by
> about 397,000 in 0.2 seconds!!
>
> First place I looked was into Matthieu's patch set release notes, where I
> find these curious words:
>
> "2.6.29 suppress one more patch "ep93xx_debounce_irq". It does not add much
> compared to 2.6.28.x
> DMA engine is not included yet."
>
> "debounce ?!?" Is that why we get so many interrupts in a row? Some kind of
> contact bounce? Are we missing a driver we need from the set built by
> Matthieu's chipset? Does this mean we can't have DMA at 2.6.29, or not at
> all? Any wise words would be greatly appreciated, thanks!
>
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